Click Events passing through Buttons if there is a Viewport underneath

[Aidan-85]

Godot version:
3.2.1.0

Issue description:
Clicks seem to pass right through a Button without triggering it if there is a sub Viewport underneath the area of the button that's clicked. It happens even if the Button has a Mouse Filter set to 'Stop'. If there's a Button within the Viewport, directly below, it receives the Event without a problem.

Steps to reproduce:
Place a button partially over a sub viewport and click area where they both overlap.

Viewport_Issue.zip

[g-mcclock]

Godot version:
3.3.2 Mono

This has become a big issue for me too. What makes it especially tricky is that it seems like any node inside the viewport can block input to a control as well, even if the viewport itself doesn't cross boundaries with the control.

For example, If button 2 is inside a viewport, with button 1 and 3 adjacent, everything works as expected.

But if I then drag button 2 e.g. upward inside the viewport, then button 2 blocks input to button 1, EVEN THOUGH it's not even onscreen and should be contained by the bounds of its viewport.

This also occurs if you drag button 2 down toward button 3.

Here's a sample project in C#/Mono
ViewportBug.zip

[Sauermann]

This bug report has two duplicates: #45400 and #48401

[Reneator]

Still happening in v3.5.stable.official [991bb6a]