user32: Factor IsRectEmpty driver check in ShowWindow.

dlls/user32/winpos.c

@@ -1044,7 +1044,7 @@ static BOOL show_window( HWND hwnd, INT cmd )
     BOOL wasVisible = (style & WS_VISIBLE) != 0;
     BOOL showFlag = TRUE;
     RECT newPos = {0, 0, 0, 0};
-    UINT swp = 0;
+    UINT new_swp, swp = 0;
 
     TRACE("hwnd=%p, cmd=%d, wasVisible %d\n", hwnd, cmd, wasVisible);
 
@@ -1117,7 +1117,9 @@ static BOOL show_window( HWND hwnd, INT cmd )
         if (!IsWindow( hwnd )) goto done;
     }
 
-    swp = USER_Driver->pShowWindow( hwnd, cmd, &newPos, swp );
+    if (IsRectEmpty( &newPos )) new_swp = swp;
+    else new_swp = USER_Driver->pShowWindow( hwnd, cmd, &newPos, swp );
+    swp = new_swp;
 
     parent = GetAncestor( hwnd, GA_PARENT );
     if (parent && !IsWindowVisible( parent ) && !(swp & SWP_STATECHANGED))

dlls/wineandroid.drv/window.c

@@ -1385,7 +1385,6 @@ void CDECL ANDROID_WindowPosChanged( HWND hwnd, HWND insert_after, UINT swp_flag
  */
 UINT CDECL ANDROID_ShowWindow( HWND hwnd, INT cmd, RECT *rect, UINT swp )
 {
-    if (IsRectEmpty( rect )) return swp;
     if (!IsIconic( hwnd )) return swp;
     /* always hide icons off-screen */
     if (rect->left != -32000 || rect->top != -32000)

dlls/winemac.drv/window.c

@@ -1798,7 +1798,6 @@ UINT CDECL macdrv_ShowWindow(HWND hwnd, INT cmd, RECT *rect, UINT swp)
           hwnd, data ? data->cocoa_window : NULL, cmd, wine_dbgstr_rect(rect), swp);
 
     if (!data || !data->cocoa_window) goto done;
-    if (IsRectEmpty(rect)) goto done;
     if (GetWindowLongW(hwnd, GWL_STYLE) & WS_MINIMIZE)
     {
         if (rect->left != -32000 || rect->top != -32000)

dlls/winex11.drv/window.c

@@ -2560,7 +2560,6 @@ UINT CDECL X11DRV_ShowWindow( HWND hwnd, INT cmd, RECT *rect, UINT swp )
     struct x11drv_win_data *data = get_win_data( hwnd );
 
     if (!data || !data->whole_window) goto done;
-    if (IsRectEmpty( rect )) goto done;
     if (style & WS_MINIMIZE)
     {
         if (((rect->left != -32000 || rect->top != -32000)) && hide_icon( data ))