bug#73496: 30.0.91; Eglot (and clangd) out of sync after switching git branches in magit

[Mikael Springer via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

1. Visit buffer with C++ code -> Eglot starts.
2. Listing references for a variable in Eglot works.
3. Switch Git branch in magit.
4. Go back to C++ buffer. Listing references for a variable using Eglot
does not work, error message in echo buffer; "jsonrpc-request:
jsonrpc-error: "request id=44 failed:", (jsonrpc-error-code . -32602),
(jsonrpc-error-message . "trying to get AST for non-added document"),
(jsonrpc-error-data)"
5. Closing the buffer and opening it again fixes the problem, or doing
eglot-reconnect also fixes the problem, listing references is working
again.
6. This is true for all open C++ buffers handled by Eglot before the
branch switch.



In GNU Emacs 30.0.91 (build 1, aarch64-apple-darwin23.6.0, NS
appkit-2487.70 Version 14.6.1 (Build 23G93)) of 2024-09-16 built on
phobos.local
Windowing system distributor 'Apple', version 10.3.2566
System Description: macOS 15.0

Configured using:
'configure --disable-dependency-tracking --disable-silent-rules
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