Merged from revision: 6824

Map Editor Fixes/Improvements (by Buggler)
- Better UI feedback after last item deleted from item stack in editor item mode
- Improved editor room number increment code. 'Shift + LMB' when drawing room numbers will reuse same room number on next input
- externalized hardcoded button tooltip text in editor tile selection window 

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@6825 3b4a5df2-a311-0410-b5c6-a8a6f20db521

Editor/editscreen.cpp

@@ -4375,8 +4375,18 @@ void ProcessAreaSelection( BOOLEAN fWithLeftButton )
 			DrawObjectsBasedOnSelectionRegion();
 			if( gusCurrRoomNumber > 0 )
 			{
-				gusCurrRoomNumber++;
-				gusMaxRoomNumber++;
+				if( gusCurrRoomNumber == gusMaxRoomNumber )
+					gusMaxRoomNumber++;
+				
+				//retain existing room number
+				if ( _KeyDown( SHIFT ) )
+				{
+					//Do nothing
+				}
+				else
+				{	
+					gusCurrRoomNumber = gusMaxRoomNumber;
+				}
 				if( iCurrentTaskbar == TASK_BUILDINGS && TextInputMode() )
 				{
 					CHAR16 str[4];