A click that takes no text tells the event reader nothing, and click records are tested for their offsets

Dogfooding saw a body right-click reported as ML0 0 2 3 qty. On file panes
the offsets were right in every case tried here (a scratch made over 9P and
clicked while another pane is active, after a hover, scrolled, soft-wrapped,
tab-indented, inside parentheses); the test now holds them. The 0 0 form
is a terminal's body, which has no offsets to give (its body is a history
snapshot); since the event file now takes a record back whole, such a record
can still be written back and done, and the docs say so. What the test did
find: a click on whitespace sent an empty record, where acme's look3 and
execute return without a word on an empty expansion (look.c:37, exec.c:141).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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