Patch of shell-command-to-string in simple for tramp support

[Shuguang Sun]

Hi,

The shell-command-to-string calls shell-file-name directly and it doesn't work in the case of local Windows and remoter Unix. I borrow the some code from shell.el and make a patch to simple.el.

Example: in find-file-in-project, shell-command-to-string was called to get the list of filenames. If it is in a remote directry via tramp, it will put error message c:/.../cmdproxy.exe not found.

The patch solves the issue.

Best Regards,

Shuguang

simple.el.diff
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