Viewport not clip control node input

[yikescloud]

Godot version:
<3.1>

#5172report the control not clip input, but I found viewport no work either.
I cannot find a simple way to let the control node not get gui_input when it's out of it's parent control node(with clip content) or a viewport. I dont understand why a node outside of a viewport
can still catch input, it makes no sense.
What I can do now is check if the the parent get the input too.

And I cannot use mouse_enter exit to check if the mouse is in parent box, because the final mouse enter/exit area is the blue area in the pic above, not only the parent block.

[Zylann]

Can reproduce in Godot 3.4 rc1
ViewportControlClipInput.zip

[Nukiloco]

This is still happening in Godot 3.5.