bug#47894: 28.0.50; isearch does not work if enable-recursive-minibuffers is on and some input method is set.

[martin rudalics]

> Okay, thanks for the clarification.  IIUC the right way to determine
> what the "current buffer" is (from a user's point of view: in which
> buffer will "a" be added if I press "a") is what I do: (window-buffer
> (selected-window)) and not what I did: (current-buffer)?

For users (eq (current-buffer) (window-buffer)) _should_ be invariant.
When and if an application temporarily violates that invariant, it
should reestablish it before the user can see it.  So if an application
calls `display-buffer' in a state where the invariant does not hold, it
should handle that case including the complication that `display-buffer'
might have selected another window.  And it goes without saying that a
display buffer action should never violate that invariant.

martin