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bug#21500: 24.5; Graphical glitch with display property lines in GUI Ema
From: |
Vasilij Schneidermann |
Subject: |
bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs |
Date: |
Thu, 17 Sep 2015 08:34:16 +0200 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
> That's the default Emacs implementation of cursor display on GUI
> frames: we erase the character at point, then draw that character
> again with cursor colors (normally, in reverse video). For
> "white-space" characters, such as TAB and the stretch of white space
> created by the 'space' display property, Emacs by default draws the
> cursor using the width of the font's SPC character. And that's
> exactly what you saw.
Interesting. Now that I've checked again, it's indeed that a terminal
frame does not show any reverse video effects at all with the cursor, so
that explains this display oddity.
> Isn't that what you originally expected to see?
I didn't expect anything specific, just that in any case the entire line
is legible. The difference between the terminal and GUI frame did stump
me.
> I don't understand: how does "invisible" come into play here? Are you
> talking about faces whose foreground and background are the same color?
Yes, if a face has the same color for fore- and background, it's
practically invisible. If you've got any more specific term for this
that is different from invisible as in the special property, I'd be
interested in knowing it.
> Yes. But the face needs to have that as part of its definition.
OK, which face would it be in this case, the cursor or the line face?
> Anyway, I see no relation between what you were wondering about and
> the effect of cursor display that I believe was the trigger for this
> bug report. If you have questions about face rendering, I suggest to
> ask them on emacs-devel.
Well, I do. If putting the cursor on a special space has a different
effect in GUI than in textual frames, I'd like to know what's causing it
and whether there is any way of fixing it.
> Can we now close the bug?
I still don't have a tangible solution at hand for fixing this display
glitch. Altering `x-stretch-cursor` is a workaround, but not as good as
altering, say, the line face to be displayed under every condition by
altering its definition.
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Vasilij Schneidermann, 2015/09/16
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Eli Zaretskii, 2015/09/16
- Message not available
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Eli Zaretskii, 2015/09/17
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs,
Vasilij Schneidermann <=
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Eli Zaretskii, 2015/09/17
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Eli Zaretskii, 2015/09/26
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Vasilij Schneidermann, 2015/09/26
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Eli Zaretskii, 2015/09/26
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Vasilij Schneidermann, 2015/09/26
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Eli Zaretskii, 2015/09/26
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Vasilij Schneidermann, 2015/09/26
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Johan Bockgård, 2015/09/26
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Vasilij Schneidermann, 2015/09/26
- bug#21500: 24.5; Graphical glitch with display property lines in GUI Emacs, Eli Zaretskii, 2015/09/26