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Julius van der Vaart
7d73882d3a
Add Line Arrow, a 41st generated arrowhead: two arms as thick as the line (at 100 % scale) meeting at right angles in a sharp tip, cut square at their ends. It is saved by the new name `LineArrow`, appended so existing names stay stable, and listed third in the arrowhead menus after Arrow (open). Its arms spread four weights either side of the line, twice as wide as the other heads, so Arrowhead now states its own reach and half width. Visual bounds and clicks on the canvas (head_reach, head_contains) use them instead of one fixed 4.6 x 2 box; every other head keeps the sizes it had. Tests: the outline test checks each head against its own reach and half width; a new test checks the line arrow's tip, corners, open middle and arm thickness; outset_covers_arrowheads checks that the wider head grows the outset; the saved-name list includes LineArrow.