RE: Stop frames stealing eachothers' minibuffers!

[Drew Adams]

(Minor)

"Whilst" ->
"While" (Amerenglish)

"the minibuffer moves" ->
"the active minibuffer moves"

"in the frame the minibuffer was first opened in" ->
"in the frame where the minibuffer was first opened"

"on the frame it was first opened on" ->
"in the frame where it was first opened"

(And decide whether a minibuffer - and a window in
general, is in or on a frame.  I don't know what the
convention might be.)

Consider splitting this sentence:

"An alternative behavior is available by customizing
'minibuffer-follows-frame' to nil; here, the
minibuffer stays on the frame it was first opened on,
and you must switch back to this frame to continue or
abort the current command."

Consider removing this gratuitous bit: "somewhat chaotic".