Mac too [was Re: Loop in x-file-dialog under MS Windows]

[Jason Rumney]

address@hidden writes:

> Quoting Ralf Angeli <address@hidden>:
>
>> AUCTeX calls `read-file-name' (and consequently `x-file-dialog') with
>> the string "<default>" as argument for the default file name.  We have
>> various reports where this call, when invoked from a menu, led to a
>> loop which made Emacs unresponsive until `C-g' was typed.  This
>> happens only under MS Windows.

I have checked in a fix for this now. I also checked in a change for
the Mac code, which had the same bug (completing_read called within a
BLOCK_INPUT block), but I do not have access to a Mac to test it. I'm
not even sure that a test case exists to trigger that code on Mac,
since it only triggered on Windows because the system dialog rejected
the < and > in "<default>" and refused to display.

I checked the GTK and Motif implementations of the function too, but
they do not have this fallback (presumably their file dialogs do not
fail frequently like the Windows one does).