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Re: Reopen bug 535: Problem with highlit regions on Linux virtual termin

From: Alan Mackenzie
Subject: Re: Reopen bug 535: Problem with highlit regions on Linux virtual terminal
Date: Mon, 6 Apr 2009 09:03:21 +0000
User-agent: Mutt/1.5.9i

Hi, Miles!

On Mon, Apr 06, 2009 at 10:12:54AM +0900, Miles Bader wrote:
> Alan Mackenzie <address@hidden> writes:
> >     C-M-h

> > to mark the function.  Note again the quality of the display (low :-().
> > We have uniform pale grey text on a bright blue background, and the sole
> > remaining vestige of the font locking is that font-lock-keyword-face
> > (and one or two others) are in bold white rather than pale grey.

> I beg to differ -- it looks great to me (high-contrast, readable, usable).
> [not just on the linux console, either, but in every environment I tried
> it in -- X, xterm, gnome-terminal, light-background, black-background]

Yes, it is high-contrast and so on, in the same way that a foghorn at
200m is highly audible when you're trying to have a quiet conversation.

> You seem to be right that it's suppressing most of the font-locking in
> the highlighted area.

It all but obliterates it.  It obliterates hi-lock mode entirely.  I
think it does this in GUI environments too.

> I don't know exactly why it does so (whether this is intentional
> behavior or an artifact of the implementation), but it's not at all
> clear to me that this behavior is a bad thing -- region highlighting
> is generally temporary,

A blaring foghorn is temporary too.

When I start Emacs 23 -Q, all of my buffers (loaded by desktop) are
foghorned - I find Emacs in this state unusable.

> and the text would very likely be _less_ readable if the font-locking
> was preserved (because the font-lock colors are designed to be
> readable with the standard background, and would in many cases be
> quite awful against the highlighted background).

I agree with the logic here.  Region highlighting is incompatible with
font lock and hi-lock.  Do you think that turning off font lock by
default might be a good solution?

> -Miles

Alan Mackenzie (Nuremberg, Germany).

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