Caps the size of the Supermaven states buffer to 1000 elements.
Previously, the buffer would grow unbounded so for long sessions the
number of states that the Supermaven autocomplete provider maintains can
be quite large. In practice, states that are sufficiently old are so
unlikely to be visited again that we can regenerate the completion.
Thus, we can cap the buffer to 1000 elements.
Release Notes:
- N/A
Track the cursor offset before biasing in the Supermaven completion
provider to better determine if the text should be suggested. The
underlying issue here is due to the way anchor biasing works, the
completion provider is not able to determine if a given suggestion's
cursor location no longer exists as it is always coalesced to a correct
location (specifically, the end of the line).
This change updates that logic so the offset is stored independently of
the buffer so it can be used to represent a location that may not exist
in the buffer anymore to represent locations that have been deleted.
The net effect is that suggestions can be backspaced much more cleanly
with Supermaven.


Release Notes:
- Improves https://github.com/zed-industries/zed/issues/17981 to prevent
suggesting completions based on out-of-date cursor locations.
Updates the inline completion provider to return a completion proposal
which is then converted to a completion state. This completion proposal
includes more detailed information about which inlays specifically
should be rendered.
Release Notes:
- Added support for fill-in-the-middle style inline completions

Adds a "Use Supermaven" and "Use Copilot" menu item to the signed out
menus for each of the autocomplete providers to make it easier to switch
between them without having to update your local settings json.
<img width="222" alt="image"
src="https://github.com/user-attachments/assets/6f760f4e-5527-4971-bdaf-383bc99649bd">
Release Notes:
- Added menu items to quickly switch between Supermaven and Copilot
inline completions when the provider is not configured
Sets the account status state to allow the Supermaven button to move out
of the "Supermaven is initializing..." state. We also need to add the
ability to sign out and change tiers but I will do that in a separate
PR.
Release Notes:
- Improved Supermaven status messages
([#12715](https://github.com/zed-industries/zed/issues/12715)).