PDF Forms - open dropdown menus disable zoom controls on macOS

[cfogelSV]

Affected versions

• 81.0a1 (2020-08-16)

Affected platforms

• macOS 11.0;

Steps to reproduce
pdfjs.renderInteractiveForms - enabled

1. Launch Firefox;
2. Access a PDF form with fillable content;
3. Click on the dropdown menu button;
4. Try to zoom in/out by pressing CTRL+ / CTRL-;

Expected result

• zoom in/out is working as expected;

Actual result

• nothing happens;

Additional notes:

• S4 as suggested severity;
• Windows 10 is not affected.

[Snuffleupagus]

Affected platforms

• macOS 11.0;

• Windows 10 is not affected.

Would this not suggest a platform bug rather than a PDF viewer one, since otherwise you'd kind of expect it to be consistently broken everywhere!?

[cfogelSV]

Probably, but in that case I'd assume that other examples such as this to also be affected; or think it would just be limited to this type of element(s)?

[bogdanmaris]

This is also reproducible on Ubuntu 18.04. Other zoom actions like CTRL+scroll wheel will dismiss the dropdown and the zoom is applied.