test: changing text of cell resets rendered status
changing the text should reset rendered flag
deleting a comm now unregisters the comm. unrehistering the comm does not close it anymore
decoupling the comm lifetime from the widget lifetime
a few todo
Transfer of border-box-sizing from js to css

`border-box-sizing` is pure styling, it has nothing to do in Javascript
it should be put in css to be overwritable.
move border-box-sizing from js to css

nothing to do in js, pure styling.
movestyling from js to css
remove js styling, already done in css + deprecate warning
move styling from js to css
remove js styling, already done in css in logoutmain
movestyling from js to css + deprecation warnign
move styling from js to css
move styling from js to css
remove uselessrandom id, and move styling to css
more cleanup
command_mode_icon typos  (dash instead of underscore)
move tolbar styling to css
comment typo
remove unused variable