Fix crash when ':write -method replace' fails to create tempfile

If a user attempts to save a file without write permission for the
containing directory, with writemethod set as 'replace' or an explicit
':write -method replace' command, kak crashes with "terminating due to
uncaught exception of type Kakoune:runtime_error". (Note this doesn't
happen with a forced write, which fails earlier when it tries to enable
u+w permission.)

Don't raise another exception when already bailing out with a runtime
error for failing to create a temporary file or open the existing file.
Instead, make a best-efforts attempt to restore the file permissions
before raising the first exception, and only report the runtime chmod
exception if that step fails on the non-error path.

0 files changed, 0 insertions, 0 deletions