Changed the size of entries number in groups tab

[alescrocaro]

Changed the size of entries number in groups tab.
Fixes #8797

• Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

See screenshots of manual tests below

1 entry file (entry with 1 digit)

12 entries file (entries with 2 digits)

103 entries file (entries with 3 digits)

1004 entries file (entries with 4 digits)

10005 entries file (entries with 5 digits)

100006 entries file (entries with 6 digits)

1000007 entries file (entries with 7 digits)

We couldn't reproduce the error for this amount of entries, because of a heap error that we believe is not related to the issue.

[Siedlerchr]

I can still reproduce it. Go to Preferences -> Appearance ->

You need to take the font size into account e.g. calculate the size based on the font. Ideally you would use "em" as unit in the width and height settings so that the size is relative to the scaling

Alternatively
Some example that might help https://rextester.com/NZG51913

#8797 (comment)

[Siedlerchr]

What's the status here? Are you going to continue working on this?

[Siedlerchr]

Closing this PR due to inactivity 💤 and as the issue is not solved.