winemac: Run a single clipboard manager thread per window station, inside the explorer process.

dlls/winemac.drv/macdrv.h

@@ -194,7 +194,7 @@ extern HKL macdrv_get_hkl_from_source(TISInputSourceRef input_source) DECLSPEC_H
 
 extern void macdrv_displays_changed(const macdrv_event *event) DECLSPEC_HIDDEN;
 
-extern void macdrv_clipboard_process_attach(void) DECLSPEC_HIDDEN;
+extern void macdrv_init_clipboard(void) DECLSPEC_HIDDEN;
 extern BOOL query_pasteboard_data(HWND hwnd, CFStringRef type) DECLSPEC_HIDDEN;
 extern const char *debugstr_format(UINT id) DECLSPEC_HIDDEN;
 extern HANDLE macdrv_get_pasteboard_data(CFTypeRef pasteboard, UINT desired_format) DECLSPEC_HIDDEN;

dlls/winemac.drv/macdrv_main.c

@@ -283,8 +283,6 @@ static BOOL process_attach(void)
         return FALSE;
     }
 
-    macdrv_clipboard_process_attach();
-
     return TRUE;
 }
 

dlls/winemac.drv/window.c

@@ -1480,6 +1480,8 @@ BOOL CDECL macdrv_CreateDesktopWindow(HWND hwnd)
  */
 BOOL CDECL macdrv_CreateWindow(HWND hwnd)
 {
+    if (hwnd == GetDesktopWindow())
+        macdrv_init_clipboard();
     return TRUE;
 }