Allow folding buffers inside multi buffers (#22046)

Closes https://github.com/zed-industries/zed/issues/4925


https://github.com/user-attachments/assets/e7b87375-893f-41ae-a2d9-d501499e40d1


Allows to fold any buffer inside multi buffers, either by clicking the
chevron icon on the header, or by using
`editor::Fold`/`editor::UnfoldLines`/`editor::ToggleFold`/`editor::FoldAll`
and `editor::UnfoldAll` actions inside the multi buffer (those were noop
there before).

Every fold has a fake line inside it, so it's possible to navigate into
that via the keyboard and unfold it with the corresponding editor
action.

The state is synchronized with the outline panel state: any fold inside
multi buffer folds the corresponding file entry; any file entry fold
inside the outline panel folds the corresponding buffer inside the multi
buffer, any directory fold inside the outline panel folds the
corresponding buffers inside the multi buffer for each nested file entry
in the panel.


Release Notes:

- Added a possibility to fold buffers inside multi buffers

---------

Co-authored-by: Antonio Scandurra <antonio@zed.dev>
Co-authored-by: Max Brunsfeld <max@zed.dev>
Co-authored-by: Cole Miller <cole@zed.dev>
This commit is contained in:
Kirill Bulatov 2024-12-16 00:32:07 +02:00 committed by GitHub
parent f64fcedabb
commit af50261ae2
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9 changed files with 2401 additions and 589 deletions

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