Reproduction:
1. in Note, type ` abcd ` in an empty note
2. color the background of all the text, bold `abcd`
3. select from the end till the letter `b`, try to change the color,
traceback pops up
Fix: The main reason is we remove element in `splitElement`/
`splitAroundUntil`. In this special case, there are two selected nodes
which returns the same font element. The first font element will be
removed and replaced first. Because the first font element doesn’t exist
anymore, when recovering selection, the second element considered as
collapsed and the recovered selection is a caret. Thus the color picker
is gone after applying the color (preview)
The fix is then, we always make sure that the font we have is still
connected to the page (exist in the page), otherwise it’s problematic to
apply color to a non-existing element and recover cursor from it. If
there is font element(s) that is not connected, we simply get the fonts
again, because new font element is created for the second node, it won’t
split (remove) the first node’s font element again
Task-3476494
closesodoo/odoo#150500
X-original-commit: 06a8b930176093e2c5a853b78431316af90f3550
Signed-off-by: Nicolas Bayet (nby) <nby@odoo.com>
Signed-off-by: Jinjiu Liu (jili) <jili@odoo.com>
Co-authored-by: Goaman <nby@odoo.com>
