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Reply-To:	Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject:	Re: Latest Cygwin update and Emacs in Mintty
To:	cygwin AT cygwin DOT com
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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Message-ID:	<4b1cf76a-ac55-3996-0592-bd3c1e1f8857@SystematicSw.ab.ca>
Date:	Thu, 15 Jun 2017 12:43:02 -0600
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On 2017-06-15 07:35, Ken Brown wrote:
> On 6/15/2017 6:47 AM, Ken Brown wrote:
>> On 6/14/2017 3:00 PM, Achim Gratz wrote:
>>> Achim Gratz writes:
>>>> After the latest Cygwin update I'm hitting an interesting problem with
>>>> emacs-nox running in a mintty: when Emacs starts, it decides that the
>>>> background color is gray instead of the usual white (for all but the
>>>> rightmost character in the status line, interestingly enough).  I have
>>>> the normal mintty background set slightly off-white (to #F8F8F8) and
>>>> mintty reports itself as xterm-256color (the same happens in when TERM
>>>> is set to screen-256color).  Emacs starts up with the correct
>>>> background
>>>> color, draws the status bar and the menu bar and only then switches the
>>>> background to gray.  The gray it choses is very slightly lighter than
>>>> the status bar (so lightly in fact that I can make out the
>>>> difference on
>>>> only one of my three monitors).  Emacs really thinks it is using a
>>>> white
>>>> background, as evidenced by the fact that (set-background-color
>>>> "white")
>>>> will produce exactly the same result.  I get my usual background back
>>>> with (set-background-color "#F8F8F8"), but I have no idea where the
>>>> wrong setting for the named color "white" comes from.
>>>>
>>>> I'm just trying this at home remotely logging in from a konsole
>>>> terminal
>>>> on my Linux box: Here the background chosen is slightly darker than the
>>>> status bar, the status bar seems to be #B8B8B8 and the background for
>>>> "white seems to be #B4B4B4.  Curious and curiouser...
>>>
>>> Ken, did you have a chance to look into this?
>>
>> Sorry, I must have missed this when you first sent it.  I'll take a look.
> 
> I also see some strange behavior, but I can't reproduce what you're
> seeing.  Here's what I tried:
> 
> 1. I edited .minttyrc to set BackgroundColour=#F8F8F8. (ForegroundColour
> is 0,0,0, which I guess is the default.)
> 
> 2. I ran 'emacs-nox -Q'.  The background color didn't visibly change;
> it's still off-white.  The mode line and menu line appear to be reversed
> (black background, off-white foreground, though I can't really be sure
> that the foreground is off-white rather than white).
> 
> 3. I evaluated (set-background-color "white").  This caused the
> background to turn gray.  The mode line and menu bar didn't visibly change.
> 
> 4. I evaluated (set-background-color "#F8F8F8").  The background stayed
> gray.
> 
> I need to investigate 3 and 4, but first I'd like to understand why you
> and I are seeing different things.  One difference is the value of TERM.
>  You say "mintty reports itself as xterm-256color".  Do you mean it does
> this by default, or do you have something in your startup files that
> causes this?  When I start mintty, I get the following:
> 
> $ echo $TERM
> xterm

Visible and selectable in mintty, Options, Terminal, Type or
{/etc/,~/.}minttyrc Term=
mintty has rgb.txt compiled in as rgb.t

emacs package installs /usr/share/emacs/25.2/etc/rgb.txt - and that has
the expected contents - is it found and loaded from there?

IANAEmacs guy

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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