[Bug]: Inconsistent highlighting on mobile

[17hoehbr]

Attach (recommended) or Link to PDF file

https://mozilla.github.io/pdf.js/web/viewer.html

Web browser and its version

Chromite 128

Operating system and its version

Android 14

PDF.js version

4.7.76

Is the bug present in the latest PDF.js version?

Yes

Is a browser extension

No

Steps to reproduce the problem

1. Toggle the highlight tool on a mobile device (possibly touch devices in general)
2. While using the highlighter, make initial touch over the text layer and swipe down

signal-2024-10-21-022022_002.mp4

What is the expected behavior?

I expected the highlighter to do free highlighting, but it seems to conflict with the text selection. On desktop browsers, making this same gesture with the mouse immediately switches to text selection mode.

Screencast_20241021_022308.webm

What went wrong?

On mobile devices, toggling text selection requires pressing and holding for a second before triggering. Therefore, nothing happens if you highlight over text.

Link to a viewer

No response

Additional context

The most straight forward solution in my opinion would be to separate the text selection highlighting and the free-handed highlighting into two separate tools.