Pen tablet stylus cannot perform left drag input in editor

[alvinhochun]

Tested versions

• Reproducible in 4.3 dev 1
• Reproducible in 4.3 dev 2
• Reproducible in 4.3 dev 3
• Reproducible in 4.3 dev 4
• Reproducible in 4.3 dev 5
• Reproducible in 4.3 dev 6
• Reproducible in 4.3 beta 1
• Reproducible in 4.3 beta 2
• Not reproducible in 4.2.2

Probably regressed by #92424

System information

Godot v4.3.beta2 - Windows 10.0.19045

Issue description

When using a pen tablet (in my case a Wacom Intuos Pen and Touch), the tip no longer works for dragging.

Steps to reproduce

In the editor, try to drag anything, e.g. reorder nodes in the scene tree or select text in the script editor.

Minimal reproduction project (MRP)

N/A

CC @bruvzg

[alvinhochun]

Oops sorry, I just realized that #92424 was merged after beta 1, so it is actually not the regressor. I can reproduce it as early as 4.3 dev 1.

I am now guessing this is caused by #84708 enabling winink by default, since changing to wintab or dummy fixes the issue. There may simply be a long-standing issue with the winink support. I did noted in chat that Godot handles WM_POINTERUPDATE but not WM_POINTERDOWN and WM_POINTERUP, which can potentially be very problematic, because since Windows 10 version 1709 (iirc) pen events gets synthesized by DefWindowProc as touch points instead of mouse events.