With 256 stops, a click on an empty part of the Tabs panel's ruler adds
no stop and shows "at most 256 tab stops" in the status bar; the stops
and the selection stay as they were. Repeat Tab adds copies only up to
256 stops and shows the same message when it stops early. Before, both
built a longer list that text.tabs.set refused, so nothing changed and
no message showed.
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