fixes jumping lines

[math-GH]

Closes #4698

hopefully I fix the issue on the root.
Unfortunately I had to use line-height with rem unit.

Pull request checklist:

• clear commit messages
• code manually tested

[Alkarex]

Nord theme is still jumping for me (Firefox and Chrome on Windows 10, 100%), all the other themes are better again 👍🏻
@Alwaysin Can you give it a try?

[Alwaysin]

Nord theme is still jumping for me (Firefox on Windows 10, 100%), all the other themes are better again 👍🏻 @Alwaysin Can you give it a try?

I have troubles applying the patch:

 # curl -L https://github.com/FreshRSS/FreshRSS/pull/4782.patch -s | git apply
error: patch failed: p/themes/Swage/swage.css:149
error: p/themes/Swage/swage.css: patch does not apply
error: patch failed: p/themes/Swage/swage.rtl.css:149
error: p/themes/Swage/swage.rtl.css: patch does not apply

[Alwaysin]

I got it working by going back to a previous commit. I didn't browse through all the themes but it looks good to me! (origine-compact, flat, pafat, and even nord)

[aledeg]

Thank you @Alwaysin for your tests! That's appreciated.

[Alkarex]

I have troubles applying the patch

@Alwaysin If you have checked out FreshRSS by git, the easiest is to continue using git for trying features and going back

# Get back to clean edge
git fetch --all --prune
git reset --hard upstream/edge
# Apply a patch
git pull https://github.com/math-GH/FreshRSS.git fix-jumping-lines

(Using the convention that upstream/edge is https://github.com/FreshRSS/FreshRSS.git and origin/edge is your own https://github.com/Alwaysin/FreshRSS.git , otherwise adapt the name of the remote accordingly)

Command-line tips can be found at the bottom of GitHub pull requests:

[Alwaysin]

Thanks for the info @Alkarex. I indeed am on git and it usually works with curl -L [...].patch | git apply. I fint it easier to get the changes this way but it looks like the fix merged earlier on Swage theme is not included here hence the conflict.

I think you need to have specific rights to see wht is on your screenshot, I don't see this. But the instructions otherwise work though!

[math-GH]

I fixed hopefully everything.

[math-GH]

This PR made an issue with BlueLagoon theme visible. Please merge #4786 before