[New Rich Text Editor]: Dynamically calculate desktop's toolbar width breakpoints

[habibayman]

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Desired behavior

A follow up issue opened after the discussion in this comment in PR #5220

To instead of having the breakpoints to folding the toolbar menu items hard coded based on calculations and trial & errors, have them dynamically calculated .

Current behavior

The breakpoints currently exist as a hard coded array. Working Just fine 👍🏻 but the code can use an enhancement.

toolbar-overflow.webm

Value add

Will make it easier if we decided to add/remove any buttons.

[MisRob]

For use-cases like this, breakpoint based approaches, whether hardcoded or dynamic, will always be a bit cumbersome. It may be best to just detect space available in the toolbar. KListWithOverflow may be handy here.