Fix bug that ListBox would not allow to 'tab' to the next element (thx @ FlavourBoat for reporting)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4741 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

 --------------------------
 Changes in 1.9 (not yet released)
 
+- Fix bug that ListBox would not allow to 'tab' to the next element (thx @ FlavourBoat for reporting)
 - IGUIEnvironment::getNextElement now public (was only in CGUIEnvironment before).
 - Add an overwrite mode to editbox. Patch provided by Adam(aka kingadami).
 - Add IGUIImages::setDrawBounds/getDrawBounds to allow coding stuff like progress bars.

source/Irrlicht/CGUIListBox.cpp

@@ -303,6 +303,10 @@ bool CGUIListBox::OnEvent(const SEvent& event)
 				}
 				return true;
 			}
+			else if (event.KeyInput.Key == KEY_TAB )
+			{
+				return false;
+			}
 			else if (event.KeyInput.PressedDown && event.KeyInput.Char)
 			{
 				// change selection based on text as it is typed.