Update TextEditor for Bokeh 3

[hoxbro]

This tries to fix two things, but to be honest, I'm not sure about the implementation for any of them. And more putting it up here to have something to talk out from.

import panel as pn

pn.extension("texteditor")

pn.widgets.TextEditor(value="Highlight me to edit formatting").servable()

With the change in patch_stylesheet, my output looks like this:

Without the selection addition:

screenrecord-2023-02-22_17.05.08.mp4

With the selection addition:

screenrecord-2023-02-22_17.03.17.mp4

Reference for the selection

[codecov]

Codecov Report

Merging #4467 (70172bc) into main (2c38e90) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4467      +/-   ##
==========================================
+ Coverage   82.09%   82.20%   +0.11%     
==========================================
  Files         243      243              
  Lines       35249    35249              
==========================================
+ Hits        28937    28977      +40     
+ Misses       6312     6272      -40     

Flag	Coverage Δ
ui-tests	35.73% <ø> (+0.26%)	⬆️
unitexamples-tests	74.09% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
panel/io/reload.py	71.73% <0.00%> (-2.18%)	⬇️
panel/io/cache.py	84.97% <0.00%> (-0.43%)	⬇️
panel/io/state.py	70.29% <0.00%> (-0.35%)	⬇️
panel/template/base.py	76.93% <0.00%> (-0.20%)	⬇️
panel/viewable.py	68.06% <0.00%> (+0.56%)	⬆️
panel/tests/util.py	89.18% <0.00%> (+0.90%)	⬆️
panel/tests/conftest.py	89.36% <0.00%> (+1.27%)	⬆️
panel/tests/test_viewable.py	100.00% <0.00%> (+1.51%)	⬆️
panel/tests/ui/io/test_jupyter_server_extension.py	100.00% <0.00%> (+50.00%)	⬆️
panel/tests/ui/widgets/test_misc.py	97.43% <0.00%> (+64.10%)	⬆️

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[philippjfr]

Sadly it does indeed look like Quill does not yet fully support the shadow DOM, here's a more complete polyfill I found in the Quill repo: slab/quill#2021 (comment)

[philippjfr]

Similar polyfill (would have to test if this works in recent Safari version): https://stackoverflow.com/questions/67914657/quill-editor-inside-shadow-dom/67944380#67944380