User report: the handles covered the highlighted text. The dots now
hang ABOVE the extent's boundary corners (teardrop tip down at the
first rect's top-left / last rect's top-right), so the highlighted
line stays readable.
Same treatment as the app leg: the nearest-char scan in the endpoint
drag is band-constrained to the boundary rect's own line (the lifted
finger floats ABOVE the text — a whole-table scan re-anchored onto the
line above). Cross-line changes go through re-selection as before.
John O'Keefe
a28ae5c88d