Extraneous 5u appears on the terminal when using fish shell

[basil]

Fixes #586. Tested by reproducing the issue before this PR; could no longer reproduce after this PR.

[tsujan]

Thank you very much! I'll review it as soon as possible.

[tsujan]

For some reason unknown to me, fish (4.3.3) doesn't show 5u here anymore without this patch, although I removed ~/.config/fish.

But there's another way to test without fish (→ #586 (comment)). Without the patch printf '\x1b[=9L' shows 9L, while with the patch it shows nothing. So, quite a progress!

However, printf '\x1b[2:=z' and printf '\e[===s' should show nothing (see the table in the above link), as is the case with XTerm and Konsole, but with the patch z and =s are still shown respectively.

[basil]

I'm aware of that. The scope of this PR was to fix the issue with a single equals sign, not to fix those other issues.

[tsujan]

The scope of this PR was to fix the issue with a single equals sign

I appreciate your code, but since the original issue isn't reproducible with fish 4.3.3, I'm not sure it's enough.

Or can someone reproduce it with a recent version of fish? @stefonarch, @marcusbritanicus?

[tsujan]

Why did you close it?!

[tsujan]

OK, the answer is #613. Thanks again!