when we click the editing widget, the variable bIsGameFakingTouch may be true, which trigger the touch event instead of click event. And it wiil lead to a bug of multi selection in umg editor like that:
I try to figure it out, and here is the code cause the bug:
ViewportWidget->HasFocusedDescendants() may return true（When we click the SWidget which SupportsKeyboardFocus return true）.
So it will not SetGameIsFakingTouchEvents to false.