Revise semantics of ns-true-dpi-images-adjust
Recognize true-dpi images using their file name
by looking for "@true_dpi".
The variable now just sets a scaling factor.
Revert "ns_do_applescript: retain NSString"

This reverts commit 76b0fd5d1789ca888020f6c0cd56744764b60be9.

(this was the wrong fix.)
Revert "ns-do-applescript: adding guards against crashes"

This reverts commit 0a949f730139b64df91264c44cf50c7643091930.

(This was the wrong fix.)
Protect as_script from garbage collection
Intended to fix crash in ns_do_applescript