The shoulder badges, the centre tick and the soft magnet used to live only
in the drag of an EXISTING opening. Placing a new one — the gesture where
you actually choose the spot — showed a bare dashed ghost.
One implementation now serves both: _opRuler() takes a wall snap, the
opening length and the Shift flag, returns the magnetised point plus the
badges/tick, and is called from _opPointerMove (drag), _openingPreview
(hover) and _openingClick (placement). The click therefore creates the
opening exactly where the preview showed it, and clearing _cursorPt makes
ghost, badges and tick disappear together the moment it lands.
Smoke: smoke_opening_measure gains a «PLACING a new opening» section (13 of
its checks fail on the previous build). TESTING.md: checklist row.
Shot: demo/shot_opening_place.mjs.
Matysh