project_panel: Collapse top-level entries in Collapse all entries command (#38310)
Closes #11760
The command `project panel: collapse all entries` currently does not
collapse top-level entries (the workspaces themselves). I think this
should be expected behaviour if you only have a single workspace in your
project. However, if you have multiple workspaces, we should collapse
their top-level folders as well. This is the expected behaviour in the
screenshots in #11760.
For more context: Atm the `.retain` function empties the
`self.expanded_dir_ids` Hash Map, because the `expanded_entries` Vec is
(almost) never empty - it contains the id of the `root_entry` of the
workspace.
https://github.com/zed-industries/zed/blob/d48d6a745409a8998998ed59c28493a1aa733ebb/crates/project_panel/src/project_panel.rs#L1148-L1152
We then update the `self.expanded_dir_ids` in the
`update_visible_entries` function, and since the Hash Map is empty, we
execute the `hash_map::Entry::Vacant` arm of the following match
statement.
https://github.com/zed-industries/zed/blob/d48d6a745409a8998998ed59c28493a1aa733ebb/crates/project_panel/src/project_panel.rs#L3062-L3073
This change makes sure that we do not clear the `expanded_dir_ids`
HashMap and always keep the keys for all visible workspaces and
therefore we run the `hash_map::Entry::Occupied` arm, which does not
override the `expanded_dir_ids` anymore.
https://github.com/user-attachments/assets/b607523b-2ea2-4159-8edf-aed7bca05e3a
cc @MrSubidubi
Release Notes:
- N/A *or* Added/Fixed/Improved ...
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Co-authored-by: Finn Evers <finn.evers@outlook.de>
