FIX: Use Xwayland with Qt6 version (issue #2290)

src/doublecmd.lpr

@@ -32,8 +32,8 @@ uses
   gtk2,
   Gtk2Int,
   {$ENDIF}
-  {$IF DEFINED(LCLQT5) and not DEFINED(DARWIN)}
-  uQt5Workaround,
+  {$IF DEFINED(LCLQT5) or DEFINED(LCLQT6)}
+  uQtWorkaround,
   {$ENDIF}
   {$ENDIF}
   uSystem,

src/platform/unix/uqt5workaround.pas → src/platform/unix/uqtworkaround.pas

@@ -1,4 +1,4 @@
-unit uQt5Workaround;
+unit uQtWorkaround;
 
 {$mode objfpc}{$H+}
 
@@ -9,15 +9,20 @@ implementation
 uses
   InitC, BaseUnix, LCLVersion;
 
+{$IF DEFINED(LCLQT5)}
 procedure _exit(status: cint); cdecl; external clib;
+{$ELSEIF DEFINED(LCLQT6)}
 function setenv(const name, value: pchar; overwrite: cint): cint; cdecl; external clib;
+{$ENDIF}
 
-{$IF LCL_FULLVERSION < 2020000}
+{$IF DEFINED(LCLQT6)}
 initialization
+  // Workaround: https://github.com/doublecmd/doublecmd/issues/2290
   if (LowerCase(fpGetEnv(PAnsiChar('XDG_SESSION_TYPE'))) = 'wayland') then
     setenv('QT_QPA_PLATFORM', 'xcb', 1);
 {$ENDIF}
 
+{$IF DEFINED(LCLQT5)}
 finalization
   // Workaround: https://doublecmd.sourceforge.io/mantisbt/view.php?id=2079
   if (UpCase(fpGetEnv(PAnsiChar('XDG_CURRENT_DESKTOP'))) = 'KDE') then
@@ -25,6 +30,7 @@ finalization
     WriteLn('Warning: Skip libKF5IconThemes exit handler');
     _exit(ExitCode);
   end;
+{$ENDIF}
 
 end.