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bug#3400: bug in add-text-properties
From: |
martin rudalics |
Subject: |
bug#3400: bug in add-text-properties |
Date: |
Thu, 28 May 2009 19:12:17 +0200 |
User-agent: |
Thunderbird 2.0.0.21 (Windows/20090302) |
> Hmm. If I have
>
> 12345
> ABCDE
>
> and I make `12345' + the newline after the `5' invisible and
> intangible, I see
>
> ABCDE
>
> in the buffer. If the blinking cursor stays on the `A', and you press
> `C-x =', do you *really* expect to see the properties of character `1'
> instead of `A'? This is completely counterintuitive IMHO.
Then the value of `point' at the time you invoke that command is
counterintuitive.
>> So IMHO this is not a bug in `add-text-properties'.
>
> Maybe. I don't know the internal details of Emacs. However, calling
> add-text-properties triggers the problem I experience.
>
>> It's arguable whether point should be allowed to be there in your
>> case,
>
> In this particular case I don't care where `point' is. I want to get
> the correct result of `C-x ='.
Don't blame `describe-char' here. It must be able to work on any buffer
position including those preceded and/or followed by invisible text.
>> but then where to move point when the entire buffer is invisible?
>
> This might be handled as a special case.
Maybe. But then you admit that the problem is with the position of
`point' ;-) Anyway, IIRC the idea was that you should be able put a
visible overlay before invisible text at the beginning of the buffer and
be able to move the cursor there. I have no idea whether that ever
worked, though.
>>> A side effect is that `C-a' no longer moves to the beginning of the
>>> line.
>> A side effect of what?
>
> Of calling add-text-properties as described in my report. I do expect
> that C-a moves the blinking cursor to the beginning of the line and
> not to the *second* character in the buffer, letter `B'.
This _is_ a bug and I doubt it's the only one with respect to moving
point over invisible text.
martin
- bug#3400: bug in add-text-properties, Werner LEMBERG, 2009/05/27
- bug#3400: bug in add-text-properties, martin rudalics, 2009/05/28
- bug#3400: bug in add-text-properties, Werner LEMBERG, 2009/05/28
- bug#3400: bug in add-text-properties,
martin rudalics <=
- bug#3400: bug in add-text-properties, Stefan Monnier, 2009/05/28
- bug#3400: bug in add-text-properties, Werner LEMBERG, 2009/05/28
- bug#3400: bug in add-text-properties, Stefan Monnier, 2009/05/28
- bug#3400: bug in add-text-properties, Werner LEMBERG, 2009/05/29
- bug#3400: bug in add-text-properties, Lennart Borgman, 2009/05/29
- bug#3400: bug in add-text-properties, Drew Adams, 2009/05/29
- bug#3400: bug in add-text-properties, Stefan Monnier, 2009/05/29
- bug#3400: bug in add-text-properties, Werner LEMBERG, 2009/05/29
- bug#3400: bug in add-text-properties, Stefan Monnier, 2009/05/29
- bug#3400: bug in add-text-properties, martin rudalics, 2009/05/29