[PATCH v2 4/4] winex11.drv: Retry last ClipCursor when grab is released

[Rémi Bernon]

As we ignore these NotifyGrab / NotifyUngrab w.r.t focus decisions,
some applications are unaware of mouse grabs being lost and sometimes
cursor clipping is lost. We have to keep the last clip rectangle and
restore it when grab is released.

Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
---
 dlls/winex11.drv/event.c  |  8 ++++++++
 dlls/winex11.drv/mouse.c  | 22 ++++++++++++++++++++++
 dlls/winex11.drv/x11drv.h |  1 +
 3 files changed, 31 insertions(+)

diff --git a/dlls/winex11.drv/event.c b/dlls/winex11.drv/event.c
index 447aa5000ca..59ab4ce4ce3 100644
--- a/dlls/winex11.drv/event.c
+++ b/dlls/winex11.drv/event.c
@@ -788,6 +788,7 @@ static BOOL X11DRV_FocusIn( HWND hwnd, XEvent *xev )
         break;
     case NotifyUngrab:
         keyboard_grabbed = FALSE;
+        retry_grab_clipping_window();
         return TRUE; /* ignore wm specific NotifyUngrab / NotifyGrab events w.r.t focus */
     }
 
@@ -888,6 +889,13 @@ static BOOL X11DRV_FocusOut( HWND hwnd, XEvent *xev )
         break;
     case NotifyGrab:
         keyboard_grabbed = TRUE;
+
+        /* This will do nothing due to keyboard_grabbed == TRUE, but it
+         * will save the current clipping rect so we can restore it on
+         * FocusIn with NotifyUngrab mode.
+         */
+        retry_grab_clipping_window();
+
         return TRUE; /* ignore wm specific NotifyUngrab / NotifyGrab events w.r.t focus */
     }
 
diff --git a/dlls/winex11.drv/mouse.c b/dlls/winex11.drv/mouse.c
index a268cd9b341..774edf55741 100644
--- a/dlls/winex11.drv/mouse.c
+++ b/dlls/winex11.drv/mouse.c
@@ -125,6 +125,8 @@ XContext cursor_context = 0;
 static HWND cursor_window;
 static HCURSOR last_cursor;
 static DWORD last_cursor_change;
+static RECT last_clip_rect;
+static BOOL last_clip_refused;
 static RECT clip_rect;
 static Cursor create_cursor( HANDLE handle );
 
@@ -395,8 +397,14 @@ static BOOL grab_clipping_window( const RECT *clip )
     if (keyboard_grabbed)
     {
         WARN( "refusing to clip to %s\n", wine_dbgstr_rect(clip) );
+        last_clip_refused = TRUE;
+        last_clip_rect = *clip;
         return FALSE;
     }
+    else
+    {
+        last_clip_refused = FALSE;
+    }
 
     /* enable XInput2 unless we are already clipping */
     if (!data->clip_hwnd) enable_xinput2();
@@ -470,6 +478,20 @@ void reset_clipping_window(void)
     ClipCursor( NULL );  /* make sure the clip rectangle is reset too */
 }
 
+/***********************************************************************
+ *      retry_grab_clipping_window
+ *
+ * Restore the current clip rectangle or retry the last one if it has
+ * been refused because of an active keyboard grab.
+ */
+void retry_grab_clipping_window(void)
+{
+    if (clipping_cursor)
+        ClipCursor( &clip_rect );
+    else if (last_clip_refused)
+        ClipCursor( &last_clip_rect );
+}
+
 BOOL CDECL X11DRV_ClipCursor( const RECT *clip );
 
 /***********************************************************************
diff --git a/dlls/winex11.drv/x11drv.h b/dlls/winex11.drv/x11drv.h
index 3a1c1a6daed..9f72bdb22c9 100644
--- a/dlls/winex11.drv/x11drv.h
+++ b/dlls/winex11.drv/x11drv.h
@@ -624,6 +624,7 @@ extern void sync_window_cursor( Window window ) DECLSPEC_HIDDEN;
 extern LRESULT clip_cursor_notify( HWND hwnd, HWND new_clip_hwnd ) DECLSPEC_HIDDEN;
 extern void ungrab_clipping_window(void) DECLSPEC_HIDDEN;
 extern void reset_clipping_window(void) DECLSPEC_HIDDEN;
+extern void retry_grab_clipping_window(void) DECLSPEC_HIDDEN;
 extern BOOL clip_fullscreen_window( HWND hwnd, BOOL reset ) DECLSPEC_HIDDEN;
 extern void move_resize_window( HWND hwnd, int dir ) DECLSPEC_HIDDEN;
 extern void X11DRV_InitKeyboard( Display *display ) DECLSPEC_HIDDEN;
-- 
2.20.1