[4.1-RC2] BUG: Background color breaks mid-paragraph using nbsp

[GlennMartin1]

Describe the bug
In 4.1-RC2, the background color breaks mid-paragraph when using nbsp.

To Reproduce
Create two paragraphs in one block with a non-breaking space between.
Choose a background color.
Save. Note that on front-end, only first section has background color.

Expected behavior
Non-breaking spaces should not break the background formatting.

Screenshots
BACK-END:

Front-end In 4.0.0:

Front-end in 4.1-RC-2

[brentswisher]

Looked into this a little bit, it is a bigger issue than just background color. If a paragraph block has two consecutive line breaks (Shift+Enter):

• In the editor, it remains one paragraph block
• On the front end, it splits into two paragraphs.

Editor Source:

Front End Source:

When this split occurs, the second paragraph does not receive the classes or styles of the original block, so no styling is applied, this includes background, color, alignment, font-size etc. One line break doesn't cause any issues.

[desrosj]

I am able to reproduce this in the 5.0 Beta 1 release with the Gutenberg plugin inactive.

[antpb]

@youknowriad is this another one that will be solved with #11050 ? seems similar

[GlennMartin1]

Yes! 4.1.1 fixed this. Thanks all.