concerted effort to reduce unneccessary redraws on transparent backgrounds

1 files changed, 5 insertions, 0 deletions

diff --git a/widgetfactory.cpp b/widgetfactory.cpp
index 25d0ce1..67d5c5c 100644
--- a/widgetfactory.cpp
+++ b/widgetfactory.cpp
@@ -178,7 +178,12 @@ commonPanelMessage(void *closure, HWND hwnd, UINT msg, WPARAM wparam, LPARAM lpa
     }
 
     if (msg == WM_SIZE && priv->bgmode == BG_GRADIENT) {
+        // HACK doing the invalidation before the layout leads to unnecessary
+        // redraws. I have no idea why, but switching the order of the calls
+        // makes the problem mostly go away.
+        LRESULT rv = ALF_Panel_DefWindowProc(hwnd, msg, wparam, lparam);
         ALF_InvalidateBackground(hwnd);
+        return rv;
     }
 
     return ALF_Panel_DefWindowProc(hwnd, msg, wparam, lparam);