This is a ~small~ pure refactor that's a step toward SSH remoting. I've
extracted the Project's buffer state management into a smaller, separate
struct called `BufferStore`, currently in the same crate. I did this as
a separate PR to reduce conflicts between main and `remoting-over-ssh`.
The idea is to make use of this struct (and other smaller structs that
make up `Project`) in a dedicated, simpler `HeadlessProject` type that
we will use in the SSH server to model the remote end of a project. With
this approach, as we develop the headless project, we can avoid adding
more conditional logic to `Project` itself (which is already very
complex), and actually make `Project` a bit smaller by extracting out
helper objects.
Release Notes:
- N/A
* properly fetch outlines from channel notes and other project-less
external files
* show better messages when for no contents
* make file entries collapsible (hiding all excerpts and outlines
beneath), keep the initial panel state unfolded up to file level
Release Notes:
- Slightly improved project panel ergonomics
- Fixed issue where outline panel remains open despite being closed
before window close.
Before the release of Outline Panel feature, everything works fine. But
after that, the outline panel keeps open. It's very annoy that I only
want to edit a simple file. Event I close it before I close the window.
The active state of this panel didn't stored.
### Description:
Before the introduction of the Outline Panel feature, the application
behaved as expected. However, with the addition of the Outline Panel, an
issue arose where the panel would persistently remain open. This
behavior was observed even when manually closing the panel before
closing the application window. The problem stemmed from the inactive
state of the panel not being stored properly. This fix addresses the
issue by ensuring that the panel's active state is correctly stored and
retrieved, thereby improving user experience and preventing unnecessary
persistence of the panel's visibility.
### Screen Records
#### Before Release of Outline Panel
https://github.com/zed-industries/zed/assets/704762/2a222c70-c6d7-4472-9f27-7868d1786a5f
#### After Release of Outline Panel
https://github.com/zed-industries/zed/assets/704762/69c16a5d-beed-4d4a-8341-83c53f6a6713
#### After Fixing This Issue
https://github.com/zed-industries/zed/assets/704762/f51c5df7-54e3-4a62-ac54-b5d12cfe69d1
### Release Notes:
- Persist outline panel open state to avoid opening it on Zed startup
