Improvements to the Ouline Explorer

[jnsebgosselin]

• Order of files in the Outline Explorer should be synced with the order of the files in its corresponding EditorStack (PR PR: Add the option to sync file order between the Outline Explorer and the current EditorStack #8015).
• Add an option to alphabetize the order of the files (PR PR: Add the option to sync file order between the Outline Explorer and the current EditorStack #8015).
• Add an option to show the root file item of files that are not Python files (Show files that are not Python files in the Outline Explorer #7982).
• Add a way to highlight the currently focused file as suggested in PR: Improvement to navigation and file switching in the Outline Explorer #7962 (comment) (PR PR: Highlight current entry in the Outline Explorer and update it on-the-fly #9219)
• Add a fuzzy search widget to filter by file names
• Add the ability to change the order of the root file item in the Outline Explorer and to sync the changes with the tabbar of the corresponding EditorStack.

Related Issues : #885, #1986, #2549, #3014, #7053, #7976

[jnsebgosselin]

#7968 (comment) by @CAM-Gerlach:

Of course, the outline explorer is still ordered alphabetically, rather than the order of the tabs in the Editor. Presumably out of scope for now, but if/when you make that change, if would be nice to have the option to either alphabetize it or make it follow the order of the editor, since both could potentially be useful depending on one's workflow.

Also, to note, the outline explorer only show Python files, so it isn't a true file switcher for more general cases. Perhaps, as a longer-term idea, we could have an option to show them (just the files without the outlines, of course).

[jnsebgosselin]

#7962 (comment) by @ccordoba12 :

My recommendation is to highlight the current file and class/method/cell/function by making the selected element to have a different background color, like VSCode does:

[ccordoba12]

I'd also like to add another suggestion here: Add a fuzzy search widget to filter by file names.

[bcolsen]

@jnsebgosselin

I found two more that would/could be solved here.

#1986 and #2549

And if this is meant to be a "catch all" issue maybe #7976

[jnsebgosselin]

Update:
"Add a way to highlight the currently focused file" was added in PR #9219 and can now be considered as completed.

[CAM-Gerlach]

@jnsebgosselin Maybe parts of PR #9384 would be useful to adapt for the outline explorer fuzzy search, e.g. the widget itself and the fuzzing code? Perhaps even use unified fuzzing code across our various fuzzy searches (variable explorer, outline, file switcher, completion of possible, etc.)?

[oscargus]

Unambiguous filenames: