comctl32/theme_scrollbar: Draw parent background before drawing control parts.

Control parts may be transparent, thus they need to be drawn on top of parent window background. Otherwise, black artifacts may occur. Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

comctl32/theme_scrollbar: Draw parent background before drawing control parts.
f8671aae · Zhiyi Zhang · Alexandre Julliard · bf6ed90c · f8671aae
Commit f8671aae authored Jun 22, 2021 by Zhiyi Zhang Committed by Alexandre Julliard Jun 22, 2021
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theme_scrollbar.c dlls/comctl32/theme_scrollbar.c +4 -0

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--- a/dlls/comctl32/theme_scrollbar.c
+++ b/dlls/comctl32/theme_scrollbar.c
@@ -332,6 +332,8 @@ static void paint_scrollbar(HWND hwnd, HTHEME theme)
        else
            state = SZB_RIGHTALIGN;
+        if (IsThemeBackgroundPartiallyTransparent(theme, SBP_SIZEBOX, state))
+            DrawThemeParentBackground(hwnd, dc, NULL);
        DrawThemeBackground(theme, dc, SBP_SIZEBOX, state, &r, NULL);
    } else {
        SCROLLINFO si;
@@ -365,6 +367,8 @@ static void paint_scrollbar(HWND hwnd, HTHEME theme)
            }
        }
+        DrawThemeParentBackground(hwnd, dc, NULL);
        if (vertical) {
            SIZE upsize, downsize;
            int uparrowstate, downarrowstate;