`BaseButton`: multitouch support, `down` and `up` events are triggered for a maximum of 1 `Button`.

[Alex2782]

Tested versions

latest master branch, PR #110893 was merged 5 days ago

System information

Android 13

Issue description

With PR #110893, we introduced multitouch support. Visually, down / up appear to work correctly, but this is not yet the case in the GdScript. down / up events cannot be triggered simultaneously with multiple buttons.

multitouch_bug.mp4

Steps to reproduce

• Open MRP
• Press the buttons as shown in the video above

Minimal reproduction project (MRP)

Test.zip