input: add special handling for tabbox modifiers

modifiersRelevantForTabBox handles modifiers being consumed, which is wrong for the
tabbox; all it needs is to ignore capslock. To ensure that happens, this commit adds
a separate method for modifiers relevant for the tabbox.

BUG: 473099

src/input.cpp

@@ -1623,7 +1623,7 @@ public:
         passToWaylandServer(event);
 
         if (event->type() == QEvent::KeyPress) {
-            workspace()->tabbox()->keyPress(event->modifiersRelevantForGlobalShortcuts() | event->key());
+            workspace()->tabbox()->keyPress(event->modifiersRelevantForTabBox() | event->key());
         } else if (static_cast<KeyEvent *>(event)->modifiersRelevantForGlobalShortcuts() == Qt::NoModifier) {
             workspace()->tabbox()->modifiersReleased();
         }

src/input_event.h

@@ -150,11 +150,22 @@ public:
         m_modifiersRelevantForShortcuts = mods;
     }
 
+    Qt::KeyboardModifiers modifiersRelevantForTabBox() const
+    {
+        return m_modifiersRelevantForTabBox;
+    }
+
+    void setModifiersRelevantForTabBox(const Qt::KeyboardModifiers &mods)
+    {
+        m_modifiersRelevantForTabBox = mods;
+    }
+
     std::chrono::microseconds timestamp() const;
 
 private:
     InputDevice *m_device;
     Qt::KeyboardModifiers m_modifiersRelevantForShortcuts = Qt::KeyboardModifiers();
+    Qt::KeyboardModifiers m_modifiersRelevantForTabBox = Qt::KeyboardModifiers();
     const std::chrono::microseconds m_timestamp;
 };
 

src/keyboard_input.cpp

@@ -259,6 +259,7 @@ void KeyboardInputRedirection::processKey(uint32_t key, InputRedirection::Keyboa
                    time,
                    device);
     event.setModifiersRelevantForGlobalShortcuts(globalShortcutsModifiers);
+    event.setModifiersRelevantForTabBox(m_xkb->modifiersRelevantForTabBox());
 
     m_input->processSpies(std::bind(&InputEventSpy::keyEvent, std::placeholders::_1, &event));
     if (!m_inited) {

src/xkb.cpp

@@ -549,6 +549,27 @@ Qt::KeyboardModifiers Xkb::modifiersRelevantForGlobalShortcuts(uint32_t scanCode
     return mods & ~consumedMods;
 }
 
+Qt::KeyboardModifiers Xkb::modifiersRelevantForTabBox() const
+{
+    if (!m_state) {
+        return Qt::NoModifier;
+    }
+    Qt::KeyboardModifiers mods = Qt::NoModifier;
+    if (xkb_state_mod_index_is_active(m_state, m_shiftModifier, XKB_STATE_MODS_EFFECTIVE) == 1) {
+        mods |= Qt::ShiftModifier;
+    }
+    if (xkb_state_mod_index_is_active(m_state, m_altModifier, XKB_STATE_MODS_EFFECTIVE) == 1) {
+        mods |= Qt::AltModifier;
+    }
+    if (xkb_state_mod_index_is_active(m_state, m_controlModifier, XKB_STATE_MODS_EFFECTIVE) == 1) {
+        mods |= Qt::ControlModifier;
+    }
+    if (xkb_state_mod_index_is_active(m_state, m_metaModifier, XKB_STATE_MODS_EFFECTIVE) == 1) {
+        mods |= Qt::MetaModifier;
+    }
+    return mods;
+}
+
 xkb_keysym_t Xkb::toKeysym(uint32_t key)
 {
     if (!m_state) {

src/xkb.h

@@ -61,6 +61,7 @@ public:
                     bool superAsMeta = false) const;
     Qt::KeyboardModifiers modifiers() const;
     Qt::KeyboardModifiers modifiersRelevantForGlobalShortcuts(uint32_t scanCode = 0) const;
+    Qt::KeyboardModifiers modifiersRelevantForTabBox() const;
     bool shouldKeyRepeat(quint32 key) const;
 
     void switchToNextLayout();