Outline pane is too slow when updating

[bcolsen]

As a follow up to PR #11010 partially fixing #10992

For large files the outliner updates are still quite slow. You can see the difference after #11010 by closing and opening the outliner pane.

The next step would be to optimize populate_branch or only run partial updates on the document near the change:

spyder/spyder/plugins/outlineexplorer/widgets.py

Line 495 in d3a0aeb

def populate_branch(self, editor, root_item, tree_cache=None):

It could also be put into a non-blocking thread as well.

[ccordoba12]

Do you have time to do this soon @bcolsen? I'm asking because I plan to do a 4.0.1 release next week with all the optimizations done during these days.

[goanpeca]

It could also be put into a non-blocking thread as well.

Definitely something to do. On the other hand, we could get rid of most of the code and use the pyls to populate it. But before we can do that we need to add cell capability to the pyls.

[ccordoba12]

Definitely something to do. On the other hand, we could get rid of most of the code and use the pyls to populate it. But before we can do that we need to add cell capability to the pyls.

I definitely think we should leave this for Spyder 5. I know is though to maintain for v4, but it could require a big refactoring to move things to the PyLS.

[bcolsen]

Do you have time to do this soon @bcolsen? I'm asking because I plan to do a 4.0.1 release next week with all the optimizations done during these days.

I think a 4.0.1 release is would be great. I won't have time in the next week or so, but over the break I'll try to see if there are any simple things I can do to speed it up.

[ccordoba12]

This no longer applies with the move to use LSP symbols in in 4.2