[OS X TeX] Applescript TeXShop crashing bug

[Ramón Figueroa-Centeno]

Aloha,

A typo in a script led to the following little discovery:

tell application "TeXShop"
	set length of selection of the front document to -5
end tell

(you must have an open document, and in my test I had nothing selected and
there where at least 50 characters before the insertion point, but I do not
know if that makes a difference).

This will crash TeXShop 2.33 on cue. So in my script that takes user input,
I must do range checking!

I think that there should be one of two fixes:
1. ignore negative selection lengths.
2. select, in my example, 5 characters backwards, which is reasonable
because if we replace -5 by 5 I get five characters selected.

Mahalo for your patience,

Ramón
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