Fix the keypress handling in MythUIButtonTree when using a grid layou…

…t in the

buttonlist.

This change allow you to use a <buttontree> widget to navigate a tree like the
gallery view in MythVideo. The main advantage is you can use the same code for
both a tree view and gallery view the only difference is in the theme.

mythtv/libs/libmythui/mythuibuttontree.cpp

@@ -533,17 +533,32 @@ bool MythUIButtonTree::keyPressEvent(QKeyEvent *event)
     {
         QString action = actions[i];
         handled = true;
-
-        if (action == "RIGHT")
+        if (m_activeList && m_activeList->m_layout == MythUIButtonList::LayoutGrid)
         {
-            SwitchList(true);
+            if (action == "SELECT" && m_currentNode->childCount() > 0)
+            {
+                SwitchList(true);
+            }
+            else if (action == "ESCAPE" && m_currentDepth > 1)
+            {
+                SwitchList(false);
+            }
+            else
+                handled = false;
         }
-        else if (action == "LEFT")
+        else
         {
-            SwitchList(false);
+            if (action == "RIGHT")
+            {
+                SwitchList(true);
+            }
+            else if (action == "LEFT")
+            {
+                SwitchList(false);
+            }
+            else
+                handled = false;
         }
-        else
-            handled = false;
     }
 
     if (!handled && m_activeList)