Revisions saved on blur even when there's no content

[afercia]

To reproduce:

• go in the Gutenberg "New Post" page
• click on the title then use the keyboard and tab a few times to tab in and then away from the Paragraph block
• wait a few seconds
• a revision gets saved and "1 Revision" appears on the sidebar

The same happens when clicking inside the paragraph and then outside without entering any content.

I haven't added any content, but there's a Revision now. I realize content is sent to TinyMCE on blur and Gutenberg adds its own delimiter comments (plus an empty paragraph added by TinyMCE?) but I guess this is not the intended behavior. Inspecting the Revisions screens, here's what gets saved:

• repeat the above steps and wait for the first Revision to get saved
• add a new Paragraph and don't enter any content
• click outside of the Paragraph
• wait a few seconds
• a second Revision gets saved, the sidebar now displays "2 Revisions"

Inspecting the second revision content, here's what gets saved:

(Note: it's also wrong because the new content it the second paragraph)

I'd consider to find a way to don't save revisions when there's no actual content entered, to avoid saving a huge amount of revisions in the DB.

[adamsilverstein]

This should be addressed by #4156

[karmatosed]

Closing this as should have been addressed, we can always reopen if not.

[adamsilverstein]

Fine to close, however wanted to note that this is currently being tracked in #4218 and is not yet resolved in master.