Re: comint read only prompt "leaking" properties

[David Kastrup]

JD Smith <address@hidden> writes:

> The read only prompt enabled in COMINT modes by
> `comint-prompt-read-only' can "leak" the read-only text property into
> subsequent input.  This inhibits the printing of the next prompt, and
> garbles the input.  The misplaced properties will also get saved on the
> input ring, and can re-inject the troublesome text upon recalling
> earlier input, even after the buffer is cleared.  Steps to reproduce:
>
> M-x shell
> M-x set-variable [Ret] comint-prompt-read-only [Ret] t [Ret]
>
> In the shell buffer:
>
> host% echo "foo" [Ret]
>
> Drag to highlight the prior command, including the space before "echo".
> Paste it in at the new prompt.
>
> host%  echo "foo"
>
> Hit Return to send the command.  Note that a new prompt is not sent,
> and that the input line keeps doubling in length.  Examine the
> properties along the input, to find that `front-sticky (read-only)
> read-only t' has been littered across the input fields.
>
> I know of know general means to inhibit any property transfer when
> pasting text in a given buffer, but if one did exist, that would be a
> (heavy handed) solution.  As another option, is there a text property
> for "don't copy any of these properties"?  I doubt anyone is ever
> interested in copying properties from the prompt.  In reality, though,
> any read-only property pasted in from anywhere can cause trouble on the
> COMINT command line.
>
> This is the list of prompt properties:
>
> (front-sticky (read-only) read-only t inhibit-line-move-field-capture t
> field output rear-nonsticky t fontified t)

Strange, this should not happen:

yank-excluded-properties is a variable defined in `simple.el'.
Its value is 
(read-only invisible intangible field mouse-face help-echo local-map keymap 
yank-handler follow-link fontified)



Documentation:
*Text properties to discard when yanking.
The value should be a list of text properties to discard or t,
which means to discard all text properties.

You can customize this variable.


-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum