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From: Jon Turney <jon.turney@dronecode.org.uk>
To: John Harris <tamboril@gmail.com>,
	The Cygwin Mailing List <cygwin@cygwin.com>
Subject: Re: Cygwin-X AWT windows snap back after drag in multi-window mode (w/example): long-standing issue
Date: Sun, 14 Aug 2022 12:11:11 +0100	[thread overview]
Message-ID: <8dc81338-b4c2-140f-cda3-bf173f5399c7@dronecode.org.uk> (raw)
In-Reply-To: <CAHbrQH6e8VdH3u-4m0DO=t3XvS11BxQy09a9hK6Y1FoJMWzOXA@mail.gmail.com>

On 13/02/2022 16:14, John Harris wrote:
> For well over ten years, I (and other developers with the same
> configuration) have been experiencing this issue with Cygwin-X in
> multi-window mode with Java AWT apps.

Sigh.

> The issue is simply that the first time (and only the first time)
> certain AWT dialogs are dragged to move them, they snap back to their
> original position.
> 
> The problem exists across JDK's, computers, cygwin versions, fresh
> installs, and everything I've tried.
> 
> This can easily be reproduced by compiling (javac) and running (java)
> the attached trivial AWT code. If you get this error at runtime:

Thanks for the simple test case.

This looks like a problem in the same area as [1], where AWT tries to 
detect what WM it running under, but doesn't really understand about 
non-reparenting WMs and messes up...

This looks like a bug in AWT in that occurs with non-reparenting WMs 
(something like: learning the size of the "insets" (size of window frame 
and decorations) the first time a ConfigureNotify event occurs makes it 
move the window back to it's original location...)

You can see some of what's happening if you turn on the 
sun.awt.X11.XDecoratedPeer logger in AWT.

I tried a few things in the multiwindow mode WM as workarounds to avoid 
tripping over this behaviour in AWT, but without success, so I can only 
suggest you raise a bug on AWT.

[1] https://cygwin.com/pipermail/cygwin-xfree/2010-July/034625.html

      parent reply	other threads:[~2022-08-14 11:11 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-13 16:14 John Harris
2022-03-23 11:38 ` Fwd: " John Harris
2022-03-23 11:57   ` Mark Hansen
2022-08-14 11:11 ` Jon Turney [this message]

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