Control nodes that are children in the Viewport override the entire screen space on which they are located and intercept all input events in this space.

[OlexiyKravchuk]

Godot version:
Godot_v3.2.3-stable_win64

OS/device including version:
W7 x64

Issue description:
Control nodes, which are children in the Viewport, override the entire screen space on which they are located and intercept all input events in this space, regardless of the layer where they are passing through any number of scenes, control nodes, and other types of nodes, and even if the parent tab is invisible.

Steps to reproduce:
check my example project

Minimal reproduction project:
BUG_IGNORING_ANY_LAYERS_GUI_NESTED_IN_Viewport.zip

[Sauermann]

Duplicate of #39666