Fix sort order after file operations

[jeremypw]

Fixes #2179
Fixes #2271
Fixes #2288

• Fix resorting after adding/renaming a file
• Fix appearance/persistence of Code backup files if "Show Hidden Files" is "OFF"

• Added insert_sorted function to model
• Added throttled resort function to model
• Used appropriate model functions
• Fixed side effects on rename after new file creation
• Made is_hidden property construct-only and include files with ~ suffix.

[zeebok]

This looks good to me. I will give it a test but feel free to merge anyway

[zeebok]

Did some testing. I tried by editing the readme, closing, re-opening to edit, closing, etc. Usually worked but occasionally it would not sort. Not sure if a different issue is showing itself here or is related to this.

After editing README:

After closing README:

Additionally the temp files don't disappear until I refresh with <Ctrl R>

Regression found

[jeremypw]

@zeebok Yes, I just noticed that myself. It works if you delete a file from the terminal but for some reason not if it is a backup file deleted by Code. Investigating....

[jeremypw]

Actually I am not sure that that issue is part of this PR since this is focused at resorting after adding/renaming a file. When a file is removed, the sort order does not change. I could probably fix the issue by resorting after deletion as well but not sure that is the most efficient way. I see whether there is a simpler way of getting the view to redraw after deletion first (it does after a terminal delete so ...)

[jeremypw]

OK, so the problem is that the backup file is a hidden file and should not be visible anyway if "show-hidden" is off (and should not be added to the model). If "show-hidden" is on, then it gets removed as expected.

[jeremypw]

Looks like this regression was introduced by https://github.com/elementary/files/pull/2200/files 😞
Need to check for ~ as a suffix as well.

[jeremypw]

@zeebok I have added the fix for the issue you noticed to this PR to save time, as it is relatively small, but should strictly be a separate PR. Please let me know if you want it separated.

[zeebok]

Well that seems to fix the issue I was seeing of the readme temp file being properly sorted with everything else. To me that fits this PR. I can open a separate issue for not seeing the .goutputstream files disappear even though they are deleted until some kind of view refresh.

[jeremypw]

The .goutputstream issue was supposed to have been fixed by #2200 so that is another regression. However, lets merge this and I'll fix that separately.