[autotests] Add test case for modifier only trigger when capslock enabled

This extends the testCapsLock to ensure that modifier only shortcut
trigger when capslock is enabled. So far the test only ensured that
capslock doesn't trigger the shift modifier only shortcut.

As the test shows currently when capslock is on, the meta key doesn't
trigger any more.

CCBUG: 375355

autotests/integration/modifier_only_shortcut_test.cpp

@@ -20,6 +20,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "kwin_wayland_test.h"
 #include "cursor.h"
 #include "input.h"
+#include "keyboard_input.h"
 #include "platform.h"
 #include "screens.h"
 #include "wayland_server.h"
@@ -283,11 +284,26 @@ void ModifierOnlyShortcutTest::testCapsLock()
     QCOMPARE(input()->keyboardModifiers(), Qt::ShiftModifier);
     QCOMPARE(triggeredSpy.count(), 1);
 
+    // meta on the other hand should trigger
+    group.writeEntry("Meta", QStringList{s_serviceName, s_path, s_serviceName, QStringLiteral("shortcut")});
+    group.writeEntry("Alt", QStringList());
+    group.writeEntry("Shift", QStringList{});
+    group.writeEntry("Control", QStringList());
+    group.sync();
+    workspace()->slotReconfigure();
+    kwinApp()->platform()->keyboardKeyPressed(KEY_LEFTMETA, timestamp++);
+    QCOMPARE(input()->keyboardModifiers(), Qt::ShiftModifier | Qt::MetaModifier);
+    QCOMPARE(input()->keyboard()->xkb()->modifiersRelevantForGlobalShortcuts(), Qt::MetaModifier);
+    kwinApp()->platform()->keyboardKeyReleased(KEY_LEFTMETA, timestamp++);
+    QEXPECT_FAIL("", "BUG 375355", Continue);
+    QCOMPARE(triggeredSpy.count(), 2);
+
     // release caps lock
     kwinApp()->platform()->keyboardKeyPressed(KEY_CAPSLOCK, timestamp++);
     kwinApp()->platform()->keyboardKeyReleased(KEY_CAPSLOCK, timestamp++);
     QCOMPARE(input()->keyboardModifiers(), Qt::NoModifier);
-    QCOMPARE(triggeredSpy.count(), 1);
+    QEXPECT_FAIL("", "BUG 375355", Continue);
+    QCOMPARE(triggeredSpy.count(), 2);
 }
 
 void ModifierOnlyShortcutTest::testGlobalShortcutsDisabled_data()