[PATCH v4 2/2] winex11: Avoid setting RDW_ERASE on expose events.

[Rémi Bernon]

From: Rémi Bernon

The Medium launcher uses a dialog window procedure, and implements its
background by doing a StretchBlt call on WM_PAINT in the dialog
procedure call, which happens before the window message loop

It then itself calls InvalidateRect(hwnd, NULL, 0), which queues a
WM_PAINT as well but with only the RDW_INVALIDATE flag.

Next, when the window message loop is executed, the WM_PAINT message is
being processed as it should, but as we've invalidated the window with
RDW_ERASE from the expose event, the WM_NCPAINT handler erases the
entire window, clearing the pixels that the launcher has just painted.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57665
---
 dlls/winex11.drv/event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/winex11.drv/event.c b/dlls/winex11.drv/event.c
index f9aa4b3f66b..cc58efed502 100644
--- a/dlls/winex11.drv/event.c
+++ b/dlls/winex11.drv/event.c
@@ -978,7 +978,7 @@ static BOOL X11DRV_Expose( HWND hwnd, XEvent *xev )
     RECT rect, abs_rect;
     POINT pos;
     struct x11drv_win_data *data;
-    UINT flags = RDW_INVALIDATE | RDW_ERASE | RDW_FRAME | RDW_ALLCHILDREN;
+    UINT flags = RDW_INVALIDATE | RDW_FRAME | RDW_ALLCHILDREN;

TRACE( "win %p (%lx) %d,%d %dx%d\n",
            hwnd, event->window, event->x, event->y, event->width, event->height );