Fix MacOS folder icon handling. Fixes #12789

[petetnt]

This PR handles an rare edge case where MacOS folder icon breaks down the whole FileTreeView. For repro steps see #12789

Background from superuser.com:

What is it?

It's name is actually Icon\r, with \r being the carriage return 0x0D. If letting the shell autocomplete the path in Terminal, it yields Icon^M, ^M being \r.

Icon^M is a file existing in all directories that have a custom icon in Finder. If you change a directory's icon e.g. in its Get Info dialog by pasting an image into the icon in the upper left corner, the Icon^M file is created.

This PR checks for the existence of an file called Icon\r, and bails out of rendering the said fileNode if it's name matches it. This is relatively safe, because you shouldn't be able to create filenames with such special characters yourself.

There's an side effect of failing to create a file called "Icon" if Icon\r already exists in the same folder, but the behaviour matches MacOS Finder, which also fails (silently).

The PR includes adds Icon\r to the default exclusion list

[ficristo]

If you change instead ProjectModel._shouldShowName would still work?
Since there is already a mechanism to hide elements from the file tree I think is better to change that.

[petetnt]

@ficristo Sadly I tried it with

var _exclusionListRegEx = /\.pyc$|^\.git$|^\.gitmodules$|^\.svn$|^\.DS_Store$|^Icon\\r$|^Thumbs\.db$|^\.hg$|^CVS$|^\.hgtags$|^\.idea$|^\.c9revisions$|^\.SyncArchive$|^\.SyncID$|^\.SyncIgnore$|\~$/;

But the regexp doesn't catch it for some reason (tried it with the m flag too). Works just fine on RegExp101: https://regex101.com/r/pLbOJH/1

If you have any ideas on how to get it working, I'd totally be into changing the check to that 👍

[ficristo]

With one slash does it work? ^Icon\r

[petetnt]

Agh, of course the test method escapes the \r by itself. Brb, fixing.

[petetnt]

@ficristo see 0c3b286

[ficristo]

If it works, LGTM

[hadome]

Thank's but how I execute this command?