Fix function widget unintended shortcut activation.

[karliss]

Happens when typing in filter. Only observed using Qt5 Appimage builds.

Your checklist for this pull request

• [x] I've read the guidelines for contributing to this repository
• [x] I made sure to follow the project's coding style
• [ ] I've updated the documentation with the relevant information (if needed)

Detailed description

Test plan (required)

• !IMPORTANT! Test using the QT5 and QT6 appimage builds from CI
• open any executable
• select function in function widget
• press N and observe rename window activating, test the X and ';' shortcuts as well
• select filter area
• type NX; -> the text should be written in input field without activating any of shortcuts

Closing issues

I thought there were a couple of similar issues, but I couldn't find them right now. If anyone remembers let me know.

Resolves some but not all cases of #3388

[karliss]

While doing last retest for the QT5 appimage found one more problematic shortcut but that one is created differently so for now will merge this fix and update the issue description with remaining problematic cases.