The Tabs panel's ruler was a fixed strip in the panel, at no relation to
the text on the canvas, so stops couldn't be placed by eye. Above Text
(Position Panel Above Text) floats the panel just above the selected
text, as wide as its ruler needs to put 0 on the text's left edge and
its marks at the canvas zoom: each stop sits over the column it sets.
Floating panel groups keep a width they are given.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>