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Subject: Re: Fwd: Limited clipboard buffer between X11 apps and Microsoft Windows
To: cygwin AT cygwin DOT com
References: <CAFMYRRNBpxYc42r9eSxYOC0v43jMGMySXeh3G-ARc1YT+k1LdA AT mail DOT gmail DOT com> <CAFMYRRPPTKzy31yYybEf2b7fMB1EGkogVmrHuGA6okB8iW2J4w AT mail DOT gmail DOT com>
From: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Reply-To: cygwin AT cygwin DOT com
Cc: Kevin Connor Arpe <kevinarpe AT gmail DOT com>
Message-ID: <564DC0E1.6080004@dronecode.org.uk>
Date: Thu, 19 Nov 2015 12:30:25 +0000
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On 17/11/2015 18:57, Kevin Connor Arpe wrote:
> My issue: Copying text between X11 apps and Microsoft Windows has
> limited clipboard buffer.  My office co-worker and I were able to
> replicate the same issue on our machines.
>
> To replicate:
> 1) Run Cygwin X Server locally.
> 2) Run gedit remotely (using company Linux hosts) and redirect display
> to our local Cygwin X Server.
> 3) Copy some text in gedit, paste in Windows app, e.g. Notepad.
>
> We are able to find a limit (approximately 1000+ lines of text).  To
> be very clear:  We can copy small amounts to text, but not large
> amounts of text.
>
> My co-worker found this historical Cygwin mailing list item.  It looks
> very similar:
> http://cygwin.1069669.n5.nabble.com/emacs-x11-new-clipboard-size-limitation-td104696.html
>
> When the copy/paste fails, I see the following in /var/log/xwin/XWin.0.log:
> [298268.591] winClipboardFlushXEvents - SelectionNotify -
> X*TextPropertyToTextList returned: XConverterNotFound

Thanks for reporting this issue.

Unfortunately, I don't think this is a recurrence of the regression in 
that old report.

Briefly, there is a different protocol [1] for transferring clipboard 
contents too large to fit in a single X protocol message (approximately 
262144 bytes), which is not currently implemented by the X11/Windows 
clipboard synchronization code.

Your estimate of 1000 lines seems a little low, but in my testing this 
is the limit I hit.

[1] 
http://www.x.org/releases/X11R7.7/doc/xorg-docs/icccm/icccm.html#INCR_Properties

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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