[PATCH 0/1] MR3197: win32u: Update the display cache when virtual desktop mode changes.

[Rémi Bernon (＠rbernon)]

We update the cache in NtUserCreateDesktopEx, as it may change existing
thread desktop flags, but we need to do it as well when a new desktop is
created while still detached, then attached to a thread through
NtUserSetThreadDesktop.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55146

This is the case when forcing virtual desktop mode with new desktop creation by running `explorer /desktop=test,1024x768 winecfg` for instance.

[PATCH 1/1] win32u: Update the display cache when virtual desktop mode changes.

[Rémi Bernon]

From: Rémi Bernon

We update the cache in NtUserCreateDesktopEx, as it may change existing
thread desktop flags, but we need to do it as well when a new desktop is
created while still detached, then attached to a thread through
NtUserSetThreadDesktop.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55146
---
 dlls/win32u/winstation.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/win32u/winstation.c b/dlls/win32u/winstation.c
index 9b97a4b4076..f99bef2bf11 100644
--- a/dlls/win32u/winstation.c
+++ b/dlls/win32u/winstation.c
@@ -248,7 +248,7 @@ HDESK WINAPI NtUserGetThreadDesktop( DWORD thread )
  */
 BOOL WINAPI NtUserSetThreadDesktop( HDESK handle )
 {
-    BOOL ret;
+    BOOL ret, was_virtual_desktop = is_virtual_desktop();

SERVER_START_REQ( set_thread_desktop )
     {
@@ -264,6 +264,7 @@ BOOL WINAPI NtUserSetThreadDesktop( HDESK handle )
         thread_info->client_info.top_window = 0;
         thread_info->client_info.msg_window = 0;
         if (key_state_info) key_state_info->time = 0;
+        if (was_virtual_desktop != is_virtual_desktop()) update_display_cache( TRUE );
     }
     return ret;
 }