Enforce XCB within code

Data/dolphin-emu.desktop

@@ -1,7 +1,7 @@
 [Desktop Entry]
 Version=1.0
 Icon=dolphin-emu
-Exec=env QT_QPA_PLATFORM=xcb dolphin-emu
+Exec=dolphin-emu
 Terminal=false
 Type=Application
 Categories=Game;Emulator;

Flatpak/org.DolphinEmu.dolphin-emu.yml

@@ -8,10 +8,6 @@ rename-icon: dolphin-emu
 finish-args:
   - --device=all
   - --socket=pulseaudio
-  # dolphin doesn't work on wayland (only the ui does), if a user were to set
-  # this env variable globally to wayland then games wouldn't work. 
-  # we overwrite the setting and force xcb to prevent this from happening.
-  - --env=QT_QPA_PLATFORM=xcb
   - --socket=x11
   - --share=network
   - --share=ipc

Source/Core/DolphinQt/Main.cpp

@@ -148,6 +148,13 @@ int main(int argc, char* argv[])
 #if (QT_VERSION >= QT_VERSION_CHECK(6, 3, 0))
   setenv("QT_XCB_NO_XI2", "1", true);
 #endif
+  // Dolphin currently doesn't work on Wayland (Only the UI does, games do not launch.) This makes
+  // XCB the default and forces it on if the platform is specified to be wayland, to prevent this
+  // from happening.
+  // For more information: https://bugs.dolphin-emu.org/issues/11807
+  const char* current_qt_platform = getenv("QT_QPA_PLATFORM");
+  const bool replace_qt_platform = (current_qt_platform && strcasecmp(current_qt_platform, "wayland") == 0);
+  setenv("QT_QPA_PLATFORM", "xcb", replace_qt_platform);
 #endif
 
   QCoreApplication::setOrganizationName(QStringLiteral("Dolphin Emulator"));