I've read through the Bugzilla comments now. My view is that:
* Apps should try to avoid distinguishing between Shift and CapsLock. I
don't know the internals of Motif, but since this seems to be a problem
limited to just the Motif toolkit (and not GTK+, QT etc), I think it looks
like the Motif guys are doing something wrong.
Btw, https://bugzilla.redhat.com/show_bug.cgi?id=577187#c0 is
inconsistent, since is says that the test case is pressing Ctrl+w, but the
xev log shows the result from "A".
* Regarding apps such as NEdit, which needs to distinguish between Ctrl+v
and Ctrl+Shift+v: Yes, this is a problem. It can be seen with rdesktop
running inside a Xvnc session as well.
* As the x11vnc documentation points out, the -capslock option is very
"hackish" and unreliable. I doubt it can be implemented with Xvnc good
enough to be of any use.
Besides the problem with Shift vs CapsLock, there's also the problem with
NumLock. For example, some Windows applications wants to look at the
NumLock state. rdesktop by default leaves it disabled. It can be enabled
with the -N option, but this obviously doesn't work with Xvnc.
I believe a complete solution to these problems would require that we
introduce some "lock sync scheme" extension (or convention) to the RFB
protocol. It won't be easy. We would need to cover Scroll Lock, and
perhaps other locks as well. This is actually on our TODO list, but with
low priority. After all, the CapsLock is seldom used nowadays.
Best regards,
Peter Åstrand
On Tue, 30 Mar 2010, Adam Tkac wrote:
Hello all,
I got report in Red Hat bugzilla that CapsLock emulation breaks some
toolkits (https://bugzilla.redhat.com/show_bug.cgi?id=577187).
Basically some toolkits check which keys are pressed and behave
differently when you press, for example, CapsLock + a + CapsLock and
when you press Shift + a + Shift. Currently we ignore CapsLock press
as written in RFB protocol but as written in
https://bugzilla.redhat.com/show_bug.cgi?id=577187#c5, x11vnc has
option which deals with CapsLock press as "expected" so it is
simply "pressed" on server side.
What do you think about that -capslock option? I know it is not nice
but I don't know about better solution of this problem.
Comments are welcomed.
Regards, Adam
--
Adam Tkac, Red Hat, Inc.
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