user32: Always call BeginPaint/EndPaint when handling a WM_PAINT message for the button.

Python 3.5 installer creates windows with class "Button" that have 0x000e button style, that causes infinite painting loops and inability to draw the installer UI. Signed-off-by: Dmitry Timoshkov <dmitry@baikal.ru> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

user32: Always call BeginPaint/EndPaint when handling a WM_PAINT message for the button.
0fe60f83 · Dmitry Timoshkov · Alexandre Julliard · e79bf359 · 0fe60f83
Commit 0fe60f83 authored Oct 19, 2015 by Dmitry Timoshkov Committed by Alexandre Julliard Oct 20, 2015
Show whitespace changes
Inline Side-by-side

Showing with 4 additions and 2 deletions

button.c dlls/user32/button.c +4 -2

No files found.
--- a/dlls/user32/button.c
+++ b/dlls/user32/button.c
@@ -282,16 +282,18 @@ LRESULT ButtonWndProc_common(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam,

    case WM_PRINTCLIENT:
    case WM_PAINT:
-        if (btnPaintFunc[btn_type])
    {
        PAINTSTRUCT ps;
        HDC hdc = wParam ? (HDC)wParam : BeginPaint( hWnd, &ps );
+        if (btnPaintFunc[btn_type])
+        {
            int nOldMode = SetBkMode( hdc, OPAQUE );
            (btnPaintFunc[btn_type])( hWnd, hdc, ODA_DRAWENTIRE );
            SetBkMode(hdc, nOldMode); /*  reset painting mode */
-            if( !wParam ) EndPaint( hWnd, &ps );
        }
+        if ( !wParam ) EndPaint( hWnd, &ps );
        break;
+    }

    case WM_KEYDOWN:
 	if (wParam == VK_SPACE)