diff --git a/autotests/integration/activation_test.cpp b/autotests/integration/activation_test.cpp
index 090b74ffdb..59d6becffb 100644
--- a/autotests/integration/activation_test.cpp
+++ b/autotests/integration/activation_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "pointer_input.h"
 #include "wayland_server.h"
 #include "window.h"
diff --git a/autotests/integration/activities_test.cpp b/autotests/integration/activities_test.cpp
index 6b71b49e34..82495ad823 100644
--- a/autotests/integration/activities_test.cpp
+++ b/autotests/integration/activities_test.cpp
@@ -10,7 +10,6 @@
 
 #include "activities.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
 #include "utils/xcbutils.h"
diff --git a/autotests/integration/dbus_interface_test.cpp b/autotests/integration/dbus_interface_test.cpp
index f5a79ce4eb..c81388e9e9 100644
--- a/autotests/integration/dbus_interface_test.cpp
+++ b/autotests/integration/dbus_interface_test.cpp
@@ -11,7 +11,6 @@
 #include "kwin_wayland_test.h"
 
 #include "atoms.h"
-#include "core/outputbackend.h"
 #include "rules.h"
 #include "virtualdesktops.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/debug_console_test.cpp b/autotests/integration/debug_console_test.cpp
index 5ce41d6c11..f6adf576a9 100644
--- a/autotests/integration/debug_console_test.cpp
+++ b/autotests/integration/debug_console_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "debug_console.h"
 #include "internalwindow.h"
 #include "utils/xcbutils.h"
diff --git a/autotests/integration/decoration_input_test.cpp b/autotests/integration/decoration_input_test.cpp
index 6f9859d2c1..a3613157f8 100644
--- a/autotests/integration/decoration_input_test.cpp
+++ b/autotests/integration/decoration_input_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "cursor.h"
 #include "internalwindow.h"
 #include "libkwineffects/kwineffects.h"
diff --git a/autotests/integration/desktop_window_x11_test.cpp b/autotests/integration/desktop_window_x11_test.cpp
index d0fd35ab1d..7b54f2fae7 100644
--- a/autotests/integration/desktop_window_x11_test.cpp
+++ b/autotests/integration/desktop_window_x11_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
 #include "utils/xcbutils.h"
diff --git a/autotests/integration/dont_crash_aurorae_destroy_deco.cpp b/autotests/integration/dont_crash_aurorae_destroy_deco.cpp
index 5793d04ba2..647a50a837 100644
--- a/autotests/integration/dont_crash_aurorae_destroy_deco.cpp
+++ b/autotests/integration/dont_crash_aurorae_destroy_deco.cpp
@@ -10,7 +10,6 @@
 
 #include "composite.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
diff --git a/autotests/integration/dont_crash_cancel_animation.cpp b/autotests/integration/dont_crash_cancel_animation.cpp
index f419803311..2baa3a29fe 100644
--- a/autotests/integration/dont_crash_cancel_animation.cpp
+++ b/autotests/integration/dont_crash_cancel_animation.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "effectloader.h"
 #include "effects.h"
 #include "scripting/scriptedeffect.h"
diff --git a/autotests/integration/dont_crash_empty_deco.cpp b/autotests/integration/dont_crash_empty_deco.cpp
index 383c207bca..bc00cbc04d 100644
--- a/autotests/integration/dont_crash_empty_deco.cpp
+++ b/autotests/integration/dont_crash_empty_deco.cpp
@@ -10,7 +10,6 @@
 
 #include "composite.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
diff --git a/autotests/integration/dont_crash_glxgears.cpp b/autotests/integration/dont_crash_glxgears.cpp
index 38d8320a2f..b0d63e86b9 100644
--- a/autotests/integration/dont_crash_glxgears.cpp
+++ b/autotests/integration/dont_crash_glxgears.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "wayland_server.h"
 #include "window.h"
 #include "workspace.h"
diff --git a/autotests/integration/dont_crash_reinitialize_compositor.cpp b/autotests/integration/dont_crash_reinitialize_compositor.cpp
index ac9cbe1b52..1584a35a65 100644
--- a/autotests/integration/dont_crash_reinitialize_compositor.cpp
+++ b/autotests/integration/dont_crash_reinitialize_compositor.cpp
@@ -11,7 +11,6 @@
 
 #include "composite.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "effectloader.h"
 #include "effects.h"
diff --git a/autotests/integration/dont_crash_useractions_menu.cpp b/autotests/integration/dont_crash_useractions_menu.cpp
index 9a9f73f70a..fc822f9b52 100644
--- a/autotests/integration/dont_crash_useractions_menu.cpp
+++ b/autotests/integration/dont_crash_useractions_menu.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "pointer_input.h"
 #include "useractions.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/effects/desktop_switching_animation_test.cpp b/autotests/integration/effects/desktop_switching_animation_test.cpp
index 441cf25a54..cad4737934 100644
--- a/autotests/integration/effects/desktop_switching_animation_test.cpp
+++ b/autotests/integration/effects/desktop_switching_animation_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "effectloader.h"
 #include "effects.h"
diff --git a/autotests/integration/effects/maximize_animation_test.cpp b/autotests/integration/effects/maximize_animation_test.cpp
index 28cb97a7be..b6feabd6d6 100644
--- a/autotests/integration/effects/maximize_animation_test.cpp
+++ b/autotests/integration/effects/maximize_animation_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "effectloader.h"
 #include "effects.h"
 #include "scene/workspacescene.h"
diff --git a/autotests/integration/effects/minimize_animation_test.cpp b/autotests/integration/effects/minimize_animation_test.cpp
index ecbf8ed4b0..0be5914820 100644
--- a/autotests/integration/effects/minimize_animation_test.cpp
+++ b/autotests/integration/effects/minimize_animation_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "effectloader.h"
 #include "effects.h"
diff --git a/autotests/integration/effects/popup_open_close_animation_test.cpp b/autotests/integration/effects/popup_open_close_animation_test.cpp
index f5d9aff4d8..f292b532e2 100644
--- a/autotests/integration/effects/popup_open_close_animation_test.cpp
+++ b/autotests/integration/effects/popup_open_close_animation_test.cpp
@@ -9,7 +9,6 @@
 
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "effectloader.h"
 #include "effects.h"
 #include "internalwindow.h"
diff --git a/autotests/integration/effects/scripted_effects_test.cpp b/autotests/integration/effects/scripted_effects_test.cpp
index 1424853d03..b084d85933 100644
--- a/autotests/integration/effects/scripted_effects_test.cpp
+++ b/autotests/integration/effects/scripted_effects_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "cursor.h"
 #include "effectloader.h"
diff --git a/autotests/integration/effects/slidingpopups_test.cpp b/autotests/integration/effects/slidingpopups_test.cpp
index 1d6ed8a642..517afa1f09 100644
--- a/autotests/integration/effects/slidingpopups_test.cpp
+++ b/autotests/integration/effects/slidingpopups_test.cpp
@@ -7,7 +7,6 @@
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "cursor.h"
 #include "effectloader.h"
diff --git a/autotests/integration/effects/toplevel_open_close_animation_test.cpp b/autotests/integration/effects/toplevel_open_close_animation_test.cpp
index 2f2a500d2a..e71ebbbabf 100644
--- a/autotests/integration/effects/toplevel_open_close_animation_test.cpp
+++ b/autotests/integration/effects/toplevel_open_close_animation_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "effectloader.h"
 #include "effects.h"
diff --git a/autotests/integration/effects/translucency_test.cpp b/autotests/integration/effects/translucency_test.cpp
index 5cd6a611ab..3383a3e31f 100644
--- a/autotests/integration/effects/translucency_test.cpp
+++ b/autotests/integration/effects/translucency_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "effectloader.h"
 #include "effects.h"
 #include "pointer_input.h"
diff --git a/autotests/integration/effects/wobbly_shade_test.cpp b/autotests/integration/effects/wobbly_shade_test.cpp
index ea3563c44a..d6be0dcfe3 100644
--- a/autotests/integration/effects/wobbly_shade_test.cpp
+++ b/autotests/integration/effects/wobbly_shade_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "cursor.h"
 #include "effectloader.h"
diff --git a/autotests/integration/fractional_scaling_test.cpp b/autotests/integration/fractional_scaling_test.cpp
index 360407e76d..94cd4970d2 100644
--- a/autotests/integration/fractional_scaling_test.cpp
+++ b/autotests/integration/fractional_scaling_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "pointer_input.h"
 #include "wayland/clientconnection.h"
 #include "wayland/display.h"
diff --git a/autotests/integration/generic_scene_opengl_test.cpp b/autotests/integration/generic_scene_opengl_test.cpp
index 75e2382982..028ef70071 100644
--- a/autotests/integration/generic_scene_opengl_test.cpp
+++ b/autotests/integration/generic_scene_opengl_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "generic_scene_opengl_test.h"
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "cursor.h"
 #include "effectloader.h"
diff --git a/autotests/integration/globalshortcuts_test.cpp b/autotests/integration/globalshortcuts_test.cpp
index b4ba1cda84..dddfe4bb52 100644
--- a/autotests/integration/globalshortcuts_test.cpp
+++ b/autotests/integration/globalshortcuts_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "input.h"
 #include "internalwindow.h"
 #include "keyboard_input.h"
diff --git a/autotests/integration/idle_inhibition_test.cpp b/autotests/integration/idle_inhibition_test.cpp
index b17f5ab0ab..d6c39af333 100644
--- a/autotests/integration/idle_inhibition_test.cpp
+++ b/autotests/integration/idle_inhibition_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "virtualdesktops.h"
 #include "wayland_server.h"
 #include "window.h"
diff --git a/autotests/integration/input_stacking_order.cpp b/autotests/integration/input_stacking_order.cpp
index 5a056d6fae..02743d4ac9 100644
--- a/autotests/integration/input_stacking_order.cpp
+++ b/autotests/integration/input_stacking_order.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
 #include "wayland/seat_interface.h"
diff --git a/autotests/integration/inputmethod_test.cpp b/autotests/integration/inputmethod_test.cpp
index 14481f4ab4..017a9d732e 100644
--- a/autotests/integration/inputmethod_test.cpp
+++ b/autotests/integration/inputmethod_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "effects.h"
 #include "inputmethod.h"
 #include "keyboard_input.h"
diff --git a/autotests/integration/internal_window.cpp b/autotests/integration/internal_window.cpp
index 8b35a64602..2d34bbfbaa 100644
--- a/autotests/integration/internal_window.cpp
+++ b/autotests/integration/internal_window.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "effects.h"
 #include "internalwindow.h"
 #include "pointer_input.h"
@@ -637,10 +636,6 @@ void InternalWindowTest::testPopup()
 
 void InternalWindowTest::testScale()
 {
-    QMetaObject::invokeMethod(kwinApp()->outputBackend(), "setVirtualOutputs", Qt::DirectConnection,
-                              Q_ARG(QVector<QRect>, QVector<QRect>({QRect(0, 0, 1280, 1024), QRect(1280 / 2, 0, 1280, 1024)})),
-                              Q_ARG(QVector<qreal>, QVector<qreal>({2, 2})));
-
     Test::setOutputConfig({
         Test::OutputInfo{
             .geometry = QRect(0, 0, 1280, 1024),
diff --git a/autotests/integration/keyboard_layout_test.cpp b/autotests/integration/keyboard_layout_test.cpp
index c750f112b8..4448502c95 100644
--- a/autotests/integration/keyboard_layout_test.cpp
+++ b/autotests/integration/keyboard_layout_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "keyboard_input.h"
 #include "keyboard_layout.h"
 #include "virtualdesktops.h"
diff --git a/autotests/integration/keymap_creation_failure_test.cpp b/autotests/integration/keymap_creation_failure_test.cpp
index d3d1ffd453..45437a1695 100644
--- a/autotests/integration/keymap_creation_failure_test.cpp
+++ b/autotests/integration/keymap_creation_failure_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "keyboard_input.h"
 #include "keyboard_layout.h"
 #include "virtualdesktops.h"
diff --git a/autotests/integration/kwin_wayland_test.cpp b/autotests/integration/kwin_wayland_test.cpp
index 51e7ae34d0..beeed25ebb 100644
--- a/autotests/integration/kwin_wayland_test.cpp
+++ b/autotests/integration/kwin_wayland_test.cpp
@@ -10,7 +10,6 @@
 
 #include "backends/virtual/virtual_backend.h"
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "core/session.h"
 #include "effects.h"
 #include "inputmethod.h"
diff --git a/autotests/integration/kwinbindings_test.cpp b/autotests/integration/kwinbindings_test.cpp
index bf555a9432..e3050aefb9 100644
--- a/autotests/integration/kwinbindings_test.cpp
+++ b/autotests/integration/kwinbindings_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "input.h"
 #include "pointer_input.h"
 #include "scripting/scripting.h"
diff --git a/autotests/integration/layershellv1window_test.cpp b/autotests/integration/layershellv1window_test.cpp
index c1d26741ca..d39e4d91b0 100644
--- a/autotests/integration/layershellv1window_test.cpp
+++ b/autotests/integration/layershellv1window_test.cpp
@@ -7,7 +7,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "main.h"
 #include "pointer_input.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/lockscreen.cpp b/autotests/integration/lockscreen.cpp
index 55834f20e3..516ffeb5b4 100644
--- a/autotests/integration/lockscreen.cpp
+++ b/autotests/integration/lockscreen.cpp
@@ -10,7 +10,6 @@
 
 #include "composite.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "core/renderbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
diff --git a/autotests/integration/maximize_test.cpp b/autotests/integration/maximize_test.cpp
index 48e5fb1121..2ef213a872 100644
--- a/autotests/integration/maximize_test.cpp
+++ b/autotests/integration/maximize_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "decorations/decorationbridge.h"
 #include "decorations/settings.h"
 #include "pointer_input.h"
diff --git a/autotests/integration/modifier_only_shortcut_test.cpp b/autotests/integration/modifier_only_shortcut_test.cpp
index 7d1653a022..5f10914108 100644
--- a/autotests/integration/modifier_only_shortcut_test.cpp
+++ b/autotests/integration/modifier_only_shortcut_test.cpp
@@ -10,7 +10,6 @@
 
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "input.h"
 #include "keyboard_input.h"
 #include "pointer_input.h"
diff --git a/autotests/integration/move_resize_window_test.cpp b/autotests/integration/move_resize_window_test.cpp
index cd2c3ab942..25cc98b447 100644
--- a/autotests/integration/move_resize_window_test.cpp
+++ b/autotests/integration/move_resize_window_test.cpp
@@ -11,7 +11,6 @@
 
 #include "atoms.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "cursor.h"
 #include "effects.h"
 #include "placement.h"
diff --git a/autotests/integration/no_global_shortcuts_test.cpp b/autotests/integration/no_global_shortcuts_test.cpp
index 9a99bbe44c..fec61628ae 100644
--- a/autotests/integration/no_global_shortcuts_test.cpp
+++ b/autotests/integration/no_global_shortcuts_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "input.h"
 #include "keyboard_input.h"
 #include "pointer_input.h"
diff --git a/autotests/integration/placement_test.cpp b/autotests/integration/placement_test.cpp
index 300699a61e..65f8f6ea3d 100644
--- a/autotests/integration/placement_test.cpp
+++ b/autotests/integration/placement_test.cpp
@@ -11,7 +11,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "placement.h"
 #include "pointer_input.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/plasma_surface_test.cpp b/autotests/integration/plasma_surface_test.cpp
index 4cef4c08ff..387036a65f 100644
--- a/autotests/integration/plasma_surface_test.cpp
+++ b/autotests/integration/plasma_surface_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "pointer_input.h"
 #include "virtualdesktops.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/plasmawindow_test.cpp b/autotests/integration/plasmawindow_test.cpp
index 5f9b671296..fd483a3c45 100644
--- a/autotests/integration/plasmawindow_test.cpp
+++ b/autotests/integration/plasmawindow_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
 #include "wayland/seat_interface.h"
diff --git a/autotests/integration/platformcursor.cpp b/autotests/integration/platformcursor.cpp
index ba2ac407f4..252f34be47 100644
--- a/autotests/integration/platformcursor.cpp
+++ b/autotests/integration/platformcursor.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "cursor.h"
 #include "wayland_server.h"
 
diff --git a/autotests/integration/pointer_constraints_test.cpp b/autotests/integration/pointer_constraints_test.cpp
index 04502f9b14..95281e797f 100644
--- a/autotests/integration/pointer_constraints_test.cpp
+++ b/autotests/integration/pointer_constraints_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "cursor.h"
 #include "keyboard_input.h"
 #include "pointer_input.h"
diff --git a/autotests/integration/pointer_input.cpp b/autotests/integration/pointer_input.cpp
index 8b5a806118..53511e8bdb 100644
--- a/autotests/integration/pointer_input.cpp
+++ b/autotests/integration/pointer_input.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "cursor.h"
 #include "libkwineffects/kwineffects.h"
 #include "options.h"
diff --git a/autotests/integration/quick_tiling_test.cpp b/autotests/integration/quick_tiling_test.cpp
index 9de63b1944..d480d3a893 100644
--- a/autotests/integration/quick_tiling_test.cpp
+++ b/autotests/integration/quick_tiling_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "cursor.h"
 #include "decorations/decorationbridge.h"
 #include "decorations/settings.h"
diff --git a/autotests/integration/screencasting_test.cpp b/autotests/integration/screencasting_test.cpp
index df02137783..568c7cb43c 100644
--- a/autotests/integration/screencasting_test.cpp
+++ b/autotests/integration/screencasting_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "composite.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "generic_scene_opengl_test.h"
 #include "pointer_input.h"
 #include "scene/workspacescene.h"
diff --git a/autotests/integration/screenedges_test.cpp b/autotests/integration/screenedges_test.cpp
index 725a41feb7..28f206d586 100644
--- a/autotests/integration/screenedges_test.cpp
+++ b/autotests/integration/screenedges_test.cpp
@@ -11,7 +11,6 @@
 #include "kwin_wayland_test.h"
 
 #include "atoms.h"
-#include "core/outputbackend.h"
 #include "cursor.h"
 #include "effectloader.h"
 #include "main.h"
diff --git a/autotests/integration/screens_test.cpp b/autotests/integration/screens_test.cpp
index 03b1752f20..85542fc0e8 100644
--- a/autotests/integration/screens_test.cpp
+++ b/autotests/integration/screens_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "pointer_input.h"
 #include "wayland_server.h"
 #include "window.h"
diff --git a/autotests/integration/scripting/minimizeall_test.cpp b/autotests/integration/scripting/minimizeall_test.cpp
index 0d10fc78a0..921a0d2e52 100644
--- a/autotests/integration/scripting/minimizeall_test.cpp
+++ b/autotests/integration/scripting/minimizeall_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "scripting/scripting.h"
 #include "wayland_server.h"
 #include "window.h"
diff --git a/autotests/integration/scripting/screenedge_test.cpp b/autotests/integration/scripting/screenedge_test.cpp
index bd4c66cae5..a7cd9aa946 100644
--- a/autotests/integration/scripting/screenedge_test.cpp
+++ b/autotests/integration/scripting/screenedge_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "effectloader.h"
 #include "pointer_input.h"
 #include "scripting/scripting.h"
diff --git a/autotests/integration/shade_test.cpp b/autotests/integration/shade_test.cpp
index d993d92ac4..419c7b12b0 100644
--- a/autotests/integration/shade_test.cpp
+++ b/autotests/integration/shade_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/showing_desktop_test.cpp b/autotests/integration/showing_desktop_test.cpp
index 7ffc10bbce..7c7f3136f8 100644
--- a/autotests/integration/showing_desktop_test.cpp
+++ b/autotests/integration/showing_desktop_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "wayland_server.h"
 #include "window.h"
 #include "workspace.h"
diff --git a/autotests/integration/stacking_order_test.cpp b/autotests/integration/stacking_order_test.cpp
index 0f7f1e9a1b..e213f164cc 100644
--- a/autotests/integration/stacking_order_test.cpp
+++ b/autotests/integration/stacking_order_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "atoms.h"
-#include "core/outputbackend.h"
 #include "main.h"
 #include "wayland_server.h"
 #include "window.h"
diff --git a/autotests/integration/struts_test.cpp b/autotests/integration/struts_test.cpp
index 9692793223..a989a47ea8 100644
--- a/autotests/integration/struts_test.cpp
+++ b/autotests/integration/struts_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
 #include "screenedge.h"
diff --git a/autotests/integration/tabbox_test.cpp b/autotests/integration/tabbox_test.cpp
index d7c3690368..7c92b048b5 100644
--- a/autotests/integration/tabbox_test.cpp
+++ b/autotests/integration/tabbox_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "input.h"
 #include "pointer_input.h"
 #include "tabbox/tabbox.h"
diff --git a/autotests/integration/test_virtualkeyboard_dbus.cpp b/autotests/integration/test_virtualkeyboard_dbus.cpp
index e587961869..8305e92101 100644
--- a/autotests/integration/test_virtualkeyboard_dbus.cpp
+++ b/autotests/integration/test_virtualkeyboard_dbus.cpp
@@ -9,7 +9,6 @@
 
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "main.h"
 #include "virtualkeyboard_dbus.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/tiles_test.cpp b/autotests/integration/tiles_test.cpp
index e5dbf66e17..9819e74af0 100644
--- a/autotests/integration/tiles_test.cpp
+++ b/autotests/integration/tiles_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
 #include "tiles/tilemanager.h"
diff --git a/autotests/integration/touch_input_test.cpp b/autotests/integration/touch_input_test.cpp
index 73c078b8c5..b401c608a9 100644
--- a/autotests/integration/touch_input_test.cpp
+++ b/autotests/integration/touch_input_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "pointer_input.h"
 #include "touch_input.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/transient_placement.cpp b/autotests/integration/transient_placement.cpp
index 9eed5d9701..ae2ee1f2fb 100644
--- a/autotests/integration/transient_placement.cpp
+++ b/autotests/integration/transient_placement.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "libkwineffects/kwineffects.h"
 #include "pointer_input.h"
 #include "wayland/seat_interface.h"
diff --git a/autotests/integration/virtual_desktop_test.cpp b/autotests/integration/virtual_desktop_test.cpp
index 3590eb2533..bb9f6f4cab 100644
--- a/autotests/integration/virtual_desktop_test.cpp
+++ b/autotests/integration/virtual_desktop_test.cpp
@@ -8,7 +8,6 @@
 */
 #include "kwin_wayland_test.h"
 
-#include "core/outputbackend.h"
 #include "main.h"
 #include "utils/xcbutils.h"
 #include "virtualdesktops.h"
diff --git a/autotests/integration/window_rules_test.cpp b/autotests/integration/window_rules_test.cpp
index 3bb49e76c6..5ec62b856a 100644
--- a/autotests/integration/window_rules_test.cpp
+++ b/autotests/integration/window_rules_test.cpp
@@ -10,7 +10,6 @@
 
 #include "atoms.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "pointer_input.h"
 #include "rules.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/window_selection_test.cpp b/autotests/integration/window_selection_test.cpp
index 7f25b9a0d6..8a939c3e13 100644
--- a/autotests/integration/window_selection_test.cpp
+++ b/autotests/integration/window_selection_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "keyboard_input.h"
 #include "pointer_input.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/x11_window_test.cpp b/autotests/integration/x11_window_test.cpp
index 2ae2ea6d1d..f87735e0c2 100644
--- a/autotests/integration/x11_window_test.cpp
+++ b/autotests/integration/x11_window_test.cpp
@@ -10,7 +10,6 @@
 
 #include "atoms.h"
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "cursor.h"
 #include "effectloader.h"
 #include "effects.h"
diff --git a/autotests/integration/xdgshellwindow_rules_test.cpp b/autotests/integration/xdgshellwindow_rules_test.cpp
index b9ffefedab..5fb167b456 100644
--- a/autotests/integration/xdgshellwindow_rules_test.cpp
+++ b/autotests/integration/xdgshellwindow_rules_test.cpp
@@ -12,7 +12,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "core/outputconfiguration.h"
 #include "cursor.h"
 #include "rules.h"
diff --git a/autotests/integration/xdgshellwindow_test.cpp b/autotests/integration/xdgshellwindow_test.cpp
index ccb1a3fbb2..82dba96d09 100644
--- a/autotests/integration/xdgshellwindow_test.cpp
+++ b/autotests/integration/xdgshellwindow_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "decorations/decorationbridge.h"
 #include "decorations/settings.h"
 #include "effects.h"
diff --git a/autotests/integration/xwayland_input_test.cpp b/autotests/integration/xwayland_input_test.cpp
index 30490bd093..e6e52298e7 100644
--- a/autotests/integration/xwayland_input_test.cpp
+++ b/autotests/integration/xwayland_input_test.cpp
@@ -9,7 +9,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "pointer_input.h"
 #include "wayland/seat_interface.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/xwayland_selections_test.cpp b/autotests/integration/xwayland_selections_test.cpp
index ef190b7910..10aadd3a75 100644
--- a/autotests/integration/xwayland_selections_test.cpp
+++ b/autotests/integration/xwayland_selections_test.cpp
@@ -10,7 +10,6 @@
 #include "kwin_wayland_test.h"
 
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "wayland/seat_interface.h"
 #include "wayland_server.h"
 #include "window.h"
diff --git a/autotests/integration/xwaylandserver_crash_test.cpp b/autotests/integration/xwaylandserver_crash_test.cpp
index ad25375c2b..2d72ce0eec 100644
--- a/autotests/integration/xwaylandserver_crash_test.cpp
+++ b/autotests/integration/xwaylandserver_crash_test.cpp
@@ -8,7 +8,6 @@
 
 #include "composite.h"
 #include "core/output.h"
-#include "core/outputbackend.h"
 #include "main.h"
 #include "scene/workspacescene.h"
 #include "wayland_server.h"
diff --git a/autotests/integration/xwaylandserver_restart_test.cpp b/autotests/integration/xwaylandserver_restart_test.cpp
index 67c262e35b..5cbd148620 100644
--- a/autotests/integration/xwaylandserver_restart_test.cpp
+++ b/autotests/integration/xwaylandserver_restart_test.cpp
@@ -7,7 +7,6 @@
 #include "kwin_wayland_test.h"
 
 #include "composite.h"
-#include "core/outputbackend.h"
 #include "main.h"
 #include "scene/workspacescene.h"
 #include "wayland_server.h"