TinyMCE view bugs

[iseulde]

• In safari, pressing enter either before or after the view won't move the cursor properly or at all.
• In Firefox a border appear around the new paragraph, with the class _moz_abspos="white".
• In all browsers deleting the previous line from before the view doesn't work.

[azaozz]

The _moz_abspos="white" is used only for styling (according to ​https://bugzilla.mozilla.org/show_bug.cgi?id=531159#c2). Used here: ​https://dxr.mozilla.org/mozilla-central/source/editor/composer/res/EditorOverride.css#166.

[azaozz]

In 39217:

TinyMCE: fix black outline around _moz_abspos. This is added in Firefox in paragraphs inserted after a non-editable block.

See #38757.

[iseulde]

@azaozz That doesn't remove the class though. The class stays if you press enter a few times...

[iseulde]

I guess it's okay because it's stripped afterwards.

[iseulde]

​https://github.com/tinymce/tinymce/issues/3325

[azaozz]

Yeah, the patch only fixed the visual glitch. Seems to happen because the caret is in an absolute positioned element when the user presses Enter. FF inserts the attributes, then removes them as soon as the user starts to type or clicks anywhere.

None of the other glitches is a regression, so thinking we can report them upstream and/or try to fix them in 4.8.

[azaozz]

Still can reproduce being unable to delete a paragraph above a wp-view when it is the first paragraph in the editor. The rest of the glitches seem fixed.

Closing as maybelater, feel free to reopen with a patch if this still needs fixing in the classic editor.