bug#12377: 24.2.50; `minibuffer-prompt-properties' should respect existing faces in prompt string

[Lars Ingebrigtsen]

"Drew Adams" <drew.adams@oracle.com> writes:

> `minibuffer-prompt-properties', via `minibuffer-prompt' face, overrides
> a `face' property that might exist on certain parts of the prompt
> string.  This is not good.  Emacs should be less overbearing and more
> respectful of prompt strings, respecting existing properties, particular
> `face', that might be present.

Yeah.  Perhaps it should use `add-face-text-property' instead of
overwriting the text properties?  Any objections?

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