Auto-sizing of single tab thumbnail ribbon, also on zoomin/out. Stops autosizing once you manually move the ribbon splitter.

rtgui/thumbbrowserentrybase.h

@@ -101,6 +101,9 @@ protected:
     void addButtonSet       (LWButtonSet* bs);
     int getMinimalHeight    () { return height; }
     int getMinimalWidth     () { return width; }
+
+    int getEffectiveHeight  () { return fnlabh+dtlabh+upperMargin+lowerMargin+textGap+height; }
+
     bool inside             (int x, int y);
     bool insideWindow       (int x, int y, int w, int h);
     void setPosition        (int x, int y, int w, int h);