Replace "toggle co-authors" button hint text with a regular tooltip #19383
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Description
This PR replaces the hint text of the toggle Co-Authors button with a regular tooltip.
While working on this, I noticed a nasty UI glitch rendering tooltips (see the thin line above the tooltip tip), which I fixed by rounding the tooltip position values.
Screenshots
Before:

After:

Release notes
Notes: [Improved] Replace hint text of toggle Co-Authors button with a regular tooltip
[Fixed] Fix UI glitch rendering tooltips