Bug 1261576 - render scrollbar thumb as "hovered" to emulate active Gtk thumb style. r=karlt

--HG--
extra : rebase_source : da38d660d48aceaa600ae8bf924c7faa186d9d39

widget/gtk/nsNativeThemeGTK.cpp

@@ -307,6 +307,8 @@ nsNativeThemeGTK::GetGtkWidgetAndState(uint8_t aWidgetType, nsIFrame* aFrame,
 
           if (CheckBooleanAttr(aFrame, nsGkAtoms::active)) {
             aState->active = TRUE;
+            // Set hover state to emulate Gtk style of active scrollbar thumb 
+            aState->inHover = TRUE;
           }
         }