bugfix for issue #569: thumbs disappear when +/- button is pressed

An implementation for redrawNeed() was lacking in the derived class BatchQueue:
when updateImage called it there was no effect.

rtgui/filebrowser.cc

@@ -639,16 +639,6 @@ void FileBrowser::notifySelectionListener () {
     }    
 }
 
-void FileBrowser::redrawNeeded (ThumbBrowserEntryBase* entry) {
-
-    if (entry->insideWindow (0, 0, internal.get_width(), internal.get_height())) {
-        if (!internal.isDirty ()) {
-            internal.setDirty ();
-            internal.queue_draw ();
-        }
-    }        
-}
-
 void FileBrowser::redrawNeeded (LWButton* button) {
     
     queue_draw ();

rtgui/filebrowser.h

@@ -116,7 +116,6 @@ class FileBrowser  : public ThumbBrowserBase, public LWButtonListener {
 
     void openDefaultViewer (int destination);
 
-    void redrawNeeded (ThumbBrowserEntryBase* entry);
     void thumbRearrangementNeeded ();
     void _thumbRearrangementNeeded ();
     

rtgui/thumbbrowserbase.cc

@@ -566,5 +566,14 @@ int ThumbBrowserBase::getEffectiveHeight() {
     return h;
 }  
 
+void ThumbBrowserBase::redrawNeeded (ThumbBrowserEntryBase* entry) {
+
+    if (entry->insideWindow (0, 0, internal.get_width(), internal.get_height())) {
+        if (!internal.isDirty ()) {
+            internal.setDirty ();
+            internal.queue_draw ();
+        }
+    }
+}
 
 

rtgui/thumbbrowserbase.h

@@ -116,7 +116,7 @@ class ThumbBrowserBase  :  public Gtk::VBox {
     virtual bool keyPressed (GdkEventKey* event) {return true;}
     virtual void selectionChanged () {}
     
-    virtual void redrawNeeded (ThumbBrowserEntryBase* entry) {}
+    virtual void redrawNeeded (ThumbBrowserEntryBase* entry);
     virtual void thumbRearrangementNeeded () {}
 
     Gtk::Widget* getDrawingArea () { return &internal; }