Changes the editor font-setting in the paragraph block from px to em

[iamgabrielma]

Fixes #2610 , but still looking for feedback if that's the best approach.

Changes the font-setting in the paragraph block from a specific pixel size (16px) to a relative size (1em).

[mtias]

I don't think we'd want ems here, it gets tricky to control in a component based system.

[iamgabrielma]

Makes sense, would you rather recommend to modify the $editor-font-size variable as per the latest commit @mtias ?

The variable is used in 4 more spots, all of them within the editor. Any feedback on the best way to go is appreciated.

Example:

[codecov]

Codecov Report

Merging #2653 into master will increase coverage by 0.8%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #2653     +/-   ##
=========================================
+ Coverage   31.38%   32.19%   +0.8%     
=========================================
  Files         177      181      +4     
  Lines        5413     5532    +119     
  Branches      949      971     +22     
=========================================
+ Hits         1699     1781     +82     
- Misses       3139     3170     +31     
- Partials      575      581      +6

Impacted Files	Coverage Δ
components/popover/index.js	92.95% <0%> (-2.36%)	⬇️
blocks/editable/format-toolbar/index.js	6.38% <0%> (-1.12%)	⬇️
blocks/editable/index.js	10.31% <0%> (-0.21%)	⬇️
editor/actions.js	41.17% <0%> (ø)	⬆️
blocks/library/button/index.js	26.66% <0%> (ø)	⬆️
blocks/library/paragraph/index.js	33.33% <0%> (ø)	⬆️
components/button/index.js	90.9% <0%> (ø)	⬆️
components/drop-zone/provider.js	1.33% <0%> (ø)	⬆️
components/autocomplete/index.js	89.04% <0%> (ø)
blocks/library/gallery/block.js	11.76% <0%> (ø)
... and 4 more

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[notnownikki]

Did we reach a decision here? I'm currently changing the font-size slider in #3090 and converting it to use em, but if that's not the right approach...

[karmatosed]

Closing this as it was discussed in this week's meeting. For now we are sticking with px.