Re: read-from-minibuffer vs asynchronous processes

[Richard Stallman]

    While one or more asynchronous processes are running AND the
    foreground program flow calls read-from-minibuffer, C-g cannot stop
    the function call. This is probably because asynchronous processes set
    inhibit-quit to non-nil and read-from-minibuffer called by the
    foreground program flow accidentally inherits it.

read-from-minibuffer does not "inherit" anything from the code that
handles asynchronous processes.  That code runs and is supposed
to clean up for itself.  This must simply be a bug.

Have you actually observed that the variable inhibit-quit is set?
Is it a fact, or a speculation?