winex11.drv: Destroy old clipping message window if it has been replaced.

When the same thread repeatedly calls ClipCursor, a message window is created for every call, then stored in x11drv_thread_data->clip_hwnd. The WM_X11DRV_CLIP_CURSOR notification is then sent to the desktop window, then to the previous clipping thread in order for it to destroy its clip_hwnd. But as the clipping thread is the same, and because x11drv_thread_data->clip_hwnd has been overwritten, it does not satisfy the "hwnd == data->clip_hwnd" condition and the window leaked. Signed-off-by: Rémi Bernon <rbernon@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

winex11.drv: Destroy old clipping message window if it has been replaced.
12c09051 · Rémi Bernon · Alexandre Julliard · 03d19f4b · 12c09051 · 12c09051
Commit 12c09051 authored Sep 16, 2019 by Rémi Bernon Committed by Alexandre Julliard Sep 17, 2019
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Showing with 12 additions and 4 deletions

mouse.c dlls/winex11.drv/mouse.c +10 -2

window.c dlls/winex11.drv/window.c +1 -1

x11drv.h dlls/winex11.drv/x11drv.h +1 -1

No files found.
--- a/dlls/winex11.drv/mouse.c
+++ b/dlls/winex11.drv/mouse.c
@@ -502,7 +502,7 @@ BOOL CDECL X11DRV_ClipCursor( const RECT *clip );
 *
 * Notification function called upon receiving a WM_X11DRV_CLIP_CURSOR.
 */
-LRESULT clip_cursor_notify( HWND hwnd, HWND new_clip_hwnd )
+LRESULT clip_cursor_notify( HWND hwnd, HWND prev_clip_hwnd, HWND new_clip_hwnd )
 {
    struct x11drv_thread_data *data = x11drv_init_thread_data();
@@ -513,7 +513,7 @@ LRESULT clip_cursor_notify( HWND hwnd, HWND new_clip_hwnd )
        HWND prev = clip_hwnd;
        clip_hwnd = new_clip_hwnd;
        if (prev || new_clip_hwnd) TRACE( "clip hwnd changed from %p to %p\n", prev, new_clip_hwnd );
-        if (prev) SendNotifyMessageW( prev, WM_X11DRV_CLIP_CURSOR, 0, 0 );
+        if (prev) SendNotifyMessageW( prev, WM_X11DRV_CLIP_CURSOR, (WPARAM)prev, 0 );
    }
    else if (hwnd == data->clip_hwnd)  /* this is a notification that clipping has been reset */
    {
@@ -530,6 +530,14 @@ LRESULT clip_cursor_notify( HWND hwnd, HWND new_clip_hwnd )
        GetClipCursor( &clip );
        X11DRV_ClipCursor( &clip );
    }
+    else if (prev_clip_hwnd)
+    {
+        /* This is a notification send by the desktop window to an old
+         * dangling clip window.
+         */
+        TRACE( "destroying old clip hwnd %p\n", prev_clip_hwnd );
+        DestroyWindow( prev_clip_hwnd );
+    }
    return 0;
 }

--- a/dlls/winex11.drv/window.c
+++ b/dlls/winex11.drv/window.c
@@ -2737,7 +2737,7 @@ LRESULT CDECL X11DRV_WindowMessage( HWND hwnd, UINT msg, WPARAM wp, LPARAM lp )
            set_window_cursor( x11drv_thread_data()->clip_window, (HCURSOR)lp );
        return 0;
    case WM_X11DRV_CLIP_CURSOR:
-        return clip_cursor_notify( hwnd, (HWND)lp );
+        return clip_cursor_notify( hwnd, (HWND)wp, (HWND)lp );
    default:
        FIXME( "got window msg %x hwnd %p wp %lx lp %lx\n", msg, hwnd, wp, lp );
        return 0;

--- a/dlls/winex11.drv/x11drv.h
+++ b/dlls/winex11.drv/x11drv.h
@@ -621,7 +621,7 @@ extern void X11DRV_InitClipboard(void) DECLSPEC_HIDDEN;
 extern void CDECL X11DRV_SetFocus( HWND hwnd ) DECLSPEC_HIDDEN;
 extern void set_window_cursor( Window window, HCURSOR handle ) DECLSPEC_HIDDEN;
 extern void sync_window_cursor( Window window ) DECLSPEC_HIDDEN;
-extern LRESULT clip_cursor_notify( HWND hwnd, HWND new_clip_hwnd ) DECLSPEC_HIDDEN;
+extern LRESULT clip_cursor_notify( HWND hwnd, HWND prev_clip_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;