ecere/gui/EditBox: Stopping OnLeftButtonDown/Up going through even if clickThrough is set
- DataBoxes automatically set EditBox editors to true
- This was causing DataBoxes to Refresh() themselves in WSMS when clicking to reposition the cursor
- A possible improvement might be to add a Modifiers flag marking an event as clickThrough so it could be ignored, so that EditBox clickThrough clicks could still be processed