Clicking any Button control while holding ALT gets ignored sometimes

[Alexofp]

Tested versions

Reproducible in:
v4.7.custom.gh [3f63a40]

Not reproducible in:
v4.7.dev4.official [755fa44]
v4.6.stable.official [89cea14]

System information

Godot v4.7.dev4 - Windows 10 (build 19045) - Multi-window, 1 monitor - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 3GB (NVIDIA; 32.0.15.8180) - Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz (4 threads) - 15.95 GiB memory

Issue description

My game is requiring to hold alt while clicking Button controls sometimes. I noticed that this now sometimes doesn't work in current master branch, the button gets highlighted but it doesn't get 'pressed' (works fine in 4.7 dev4). This issue affects both the editor and any games that have Button controls.

Steps to reproduce

2026-04-16.15-12-22.mp4

Simplest way to trigger it is:

1. Select any project in the project manager (to make the buttons on the right get enabled)
2. Click on the empty space below the buttons (important for some reason)
3. Hold ALT and click on any button. The button will get highlighted but it won't get 'pressed' no matter how many times you click it.

ONLY the current master is affected. 4.7 dev4 (and earlier) will always trigger the button correctly. So it must be something recent

Minimal reproduction project (MRP)

Doesn't require a MRP

[AThousandShips]

Given the timing this is probably a result of:

• BaseButton: multitouch support #110893

But can't test right now

[Alex2782]

MacOS doesn't seem to be affected. I've tried the command and option (alt) keys.

---

Doesn't require a MRP

Small MRPs are usually easier to debug.

#118542 (review)

@Alexofp Can you reproduce it with the test project there (multitouch.zip)?
I could check again in a few hours under Windows 11 using the Windows "Alt" keys.

Please also try the web export:
https://alex2782.github.io/multitouch/master/
https://alex2782.github.io/multitouch/PR_118542/

[Alexofp]

Current master (gets stuck if you hold ALT)

2026-04-16.16-28-20.mp4

godot 4.7dev4 (works perfectly)

2026-04-16.16-29-18.mp4

Both the web export links you gave have the same behaviour as master (if you hold ALT, the button gets stuck, in both of them)