[PATCH] winex11.drv: Always add MWM_FUNC_CLOSE to enabled windows.

[Zhiyi Zhang]

Some window managers require MWM_FUNC_CLOSE to be present for a window to be allowed to close. For
example, on KWin, a window of style WS_POPUP | WS_VISIBLE has a close button drawn on top of its
taskbar preview. But when you press it, the window manager refuses to close it. On Mutter, windows
without MWN_FUNC_CLOSE doesn't have a close button on the window preview. On Windows 10, enabled
windows without WS_SYSMENU always has a close button on their taskbar window preview and can always
be closed with the close button. On Windows 7, enabled windows without WS_SYSMENU has no close
button on the window preview but still can be closed with the right-click menu on the taskbar.
This patch changes the behavior to match that of Windows 10.

Fix WeChat image preview window cannot be closed from KDE panels.

Signed-off-by: Zhiyi Zhang 
---
 dlls/winex11.drv/window.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/winex11.drv/window.c b/dlls/winex11.drv/window.c
index 386f21c85d4..4e856a41865 100644
--- a/dlls/winex11.drv/window.c
+++ b/dlls/winex11.drv/window.c
@@ -749,9 +749,9 @@ static void set_mwm_hints( struct x11drv_win_data *data, DWORD style, DWORD ex_s
         if (is_window_resizable( data, style )) mwm_hints.functions |= MWM_FUNC_RESIZE;
         if (!(style & WS_DISABLED))
         {
+            mwm_hints.functions |= MWM_FUNC_CLOSE;
             if (style & WS_MINIMIZEBOX) mwm_hints.functions |= MWM_FUNC_MINIMIZE;
             if (style & WS_MAXIMIZEBOX) mwm_hints.functions |= MWM_FUNC_MAXIMIZE;
-            if (style & WS_SYSMENU)     mwm_hints.functions |= MWM_FUNC_CLOSE;

/* The window can be programmatically minimized even without
                a minimize box button. Allow the WM to restore it. */