[PATCH] comctl32: Remove the masked background also when adding alpha images.

[Gabriel Ivăncescu]

Fixes a regression introduced by 61b9209221d28d5d02379791ac1316c1fc2ca3b7.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50454
Signed-off-by: Gabriel Ivăncescu 
---
 dlls/comctl32/imagelist.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/dlls/comctl32/imagelist.c b/dlls/comctl32/imagelist.c
index a6d9c73..170320c 100644
--- a/dlls/comctl32/imagelist.c
+++ b/dlls/comctl32/imagelist.c
@@ -290,6 +290,24 @@ static BOOL add_with_alpha( HIMAGELIST himl, HDC hdc, int pos, int count,
     }

add_dib_bits( himl, pos, count, width, height, info, mask_info, bits, mask_bits );
+
+    if (hbmMask && himl->hbmMask)
+    {
+        HDC hdcTemp = CreateCompatibleDC(0);
+        POINT pt;
+        INT i;
+
+        SelectObject(hdcTemp, hbmMask);
+        for (i = 0; i < count; i++)
+        {
+            imagelist_point_from_index( himl, pos + i, &pt );
+            BitBlt( himl->hdcMask, pt.x, pt.y, width, height, hdcTemp, i * width, 0, SRCCOPY );
+
+            /* Remove the background from the image */
+            BitBlt( himl->hdcImage, pt.x, pt.y, width, height, himl->hdcMask, pt.x, pt.y, 0x220326 ); /* NOTSRCAND */
+        }
+        DeleteDC(hdcTemp);
+    }
     ret = TRUE;

done: