bug#70541: track-changes-mode logs warnings (with input method, in Eglot buffer)

[Stefan Monnier]

> * Start Eglot. (The "b" is highlighted to indicate an error.)
> * Enable the TeX input method.
> * Put point after the zero.
> * (Enter the bad state.) Quickly, type [<backspace> ^]. Pause.
> * Type [<backspace> y]. (No error highlight on "y".)
> * Move point to before the "x". (No "variable x" echo from Eldoc.)
> * Move point back to after the "y".
> * Type [<backspace> z] again. (Still no error highlight on "z".)
> * Type [SPC]. (Highlight on "b" is now rendered incorrectly.)
> * (Exit the bad state.) Type [C-n SPC <backspace>].

So you confirm that you don't see the "Missing/incorrect calls
..." warnings.  Thanks.  The fact that Eglot doesn't update until you
modify some "disjoint" part of the buffer was a known limitation of the
fix I installed.  I'll push a more complete fix RealSoonNow.


        Stefan