properly notify Cairo when drawing a gradient to a ThresholdAdjuster

Candidate fix for #3769
Beep6581 · May 5, 2017 · 8ae6419 · 8ae6419
1 parent b303679
commit 8ae6419
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/rtgui/coloredbar.cc b/rtgui/coloredbar.cc
@@ -131,6 +131,8 @@ void ColoredBar::updateBackBuffer(Gtk::DrawingArea &drawingArea)
         } else {
             // ask the ColorProvider to provide colors :) for each pixels
             if (colorProvider) {
+                surface->flush();
+
                 unsigned char *surfaceData = surface->get_data();
 
                 cr->set_antialias(Cairo::ANTIALIAS_NONE);
@@ -202,6 +204,8 @@ void ColoredBar::updateBackBuffer(Gtk::DrawingArea &drawingArea)
 
                     break;
                 }
+
+                surface->mark_dirty();
             }
         }