Cherry Pick PR's for WordPress 5.4 RC 2

[jorgefilipecosta]

Description

This PR cherry picks the following PR's into wp/trunk:

PR title	Author
Media & Text Block: Fix the "Crop image to fill entire column" option	@WunderBart
Media & Text Block: Fix frontend styles when "Crop image to fill" is selected	@jffng
Improve the Back to WP button in Fullscreen Mode	@youknowriad
Try, fix inserter being hidden.	@jasmussen
Block Editor: Use full labels for directional block movers	@aduth
Fix: Custom color formatter may end up "bouncing"	@jorgefilipecosta
[LatestPosts] Don't trim manual excerpts	@draganescu
Update browserslist to fix out-of-date caniuse-lite messages	@nerrad

The following PR's had conflicts:

• Improve the Back to WP button in Fullscreen Mode: Fixed by changing new variables to variables that exist in trunk. Changes in file packages/edit-post/src/components/header/fullscreen-mode-close/style.scss were tottally ignored as these changes seem g2 specific and did not matched the current design in trunk. cc: @youknowriad

• Try, fix inserter being hidden: Fixed by changing new variables to variables that exist in trunk. cc: @jasmussen

• Block Editor: Use full labels for directional block movers: The conflict was manually handled without any specific change. cc: @aduth

These PR's will be part of WordPress 5.4 RC 2.

How has this been tested?

I did some smoke tests and verified the branch, in fact, contained the expected fixes.

[aduth]

For the failing build, it might be necessary to cherry-pick this one as well: #20709

[jorgefilipecosta]

Thank you @aduth, that PR was included.

[aduth]

I did a test run of cherry-picking 0e0e260 (#20664) onto wp/trunk to better understand what specific conflicts there are. After assessing those conflicts, I think the resolution proposed in this pull request is accurate 👍

[aduth]

Should the changes of fullscreen-mode-close/style.scss from here be expected to have been included?

https://github.com/WordPress/gutenberg/pull/20603/files#diff-dc73cdea1bb8cbe699286d82c89bf892

[jorgefilipecosta]

Should the changes of fullscreen-mode-close/style.scss from here be expected to have been included?#20603 (files)

Hi @aduth, these changes applied a design to the button that looks good on g2 but not on trunk (as the button becomes different from all the other UI elements with a black background), so the changes on that file were not included.

[aduth]

As before, I'm most familiar with my own changes included here, but aside from the items I noted previously (which appear to be sorted), this looks in good shape 👍

[mapk]

I just tested the PR and it all worked as expected. 👍

I did discuss some UI changes for the "W" icon in the upper left corner. Those are being implemented by @jorgefilipecosta.

[jasmussen]

Thank you for this. I sense it was a tricky cherry-picking, so all the more thanks for taking care of it.