Fixed issue #317 (filmstrip does not scroll to opened image when entering editor)

rtgui/thumbbrowserbase.cc

@@ -529,6 +529,12 @@ void ThumbBrowserBase::enableTabMode(bool enable) {
         refreshThumbImages();
     else
         redraw();
+
+    // Scroll to selected position if going into ribbon mode
+    if (inTabMode && !selected.empty()) {
+        int h=selected[0]->getStartX();
+        hscroll.set_value (MIN(h, hscroll.get_adjustment()->get_upper()));
+    }
 }
 
 void ThumbBrowserBase::initEntry (ThumbBrowserEntryBase* entry) {

rtgui/thumbbrowserentrybase.h

@@ -103,6 +103,7 @@ protected:
     int getMinimalWidth     () { return width; }
 
     int getEffectiveHeight  () { return fnlabh+dtlabh+exlabh+textGap+exp_height; }
+    int getStartX           () { return startx; }
 
     bool inside             (int x, int y);
     bool insideWindow       (int x, int y, int w, int h);