How to troubleshoot possible intermittent issues with cua-mode in recent Emacs?

How to troubleshoot possible intermittent issues with cua-mode in recent Emacs?

[N. Jackson]

In recent days (probably for less than a week, but perhaps for two or
three weeks) I've been experiencing a possible intermittent problem with
CUA Mode.

I'm looking for suggestions about for what to look for next time the
problem occurs.

I am running Emacs 25.0.95 from the prerelease tarball. I might have
seen this problem (if it really exists) with 25.0.94 too but I don't
think so. I certainly didn't see it before 25.0.94.

The symptoms are that I select some text (using the shifted arrow
keys), copy it with C-c, switch to another application (typically an
input form in web browser) and paste. At this point I realise that my
copy operation failed, as I get a stale clipboard value pasted.
Suspecting user error, I switch back to Emacs and try my copy again and
see in the minibuffer something like "C-c C-c is undefined".

That is, the initial C-c seems to have been treated as a prefix key not
as a copy command.

Once I get into this state, C-c no longer works for copy. Looking at the
Options menu, "Use CUA Keys" is still checked. Unchecking it, then
checking it again does not seem to help to get C-c behaving again.

However, doing a copy with M-w seems to clear the problem (until it
comes back a few days later).

I apologise that some of this information is a bit tentative. I tend to
use copy and paste fully on autopilot.

I've been using CUA Mode in Emacs for years, so I don't think this is
user error. (But of course it might be.)

Note: I have cua-prefix-override-inhibit-delay set to 0.3 and I'm half
wondering if something is going wrong with this timer.

Troubleshooting suggestions welcome. Thanks.

Regards,
N.

Re: How to troubleshoot possible intermittent issues with cua-mode in recent Emacs?

[John Mastro]

N. Jackson <nljlistbox2@gmail.com> wrote:
> In recent days (probably for less than a week, but perhaps for two or
> three weeks) I've been experiencing a possible intermittent problem
> with CUA Mode.

I suggest submitting this as a bug report (via M-x report-emacs-bug),
despite some of the details being tentative.

        John

Re: How to troubleshoot possible intermittent issues with cua-mode in recent Emacs?

[John Mastro]

John Mastro <john.b.mastro@gmail.com> wrote:
> N. Jackson <nljlistbox2@gmail.com> wrote:
>> In recent days (probably for less than a week, but perhaps for two or
>> three weeks) I've been experiencing a possible intermittent problem
>> with CUA Mode.
>
> I suggest submitting this as a bug report (via M-x report-emacs-bug),
> despite some of the details being tentative.

One thing that would be useful to know for troubleshooting (and that the
Emacs developers will likely ask you anyway) is whether the same issue
occurs when you run Emacs without your customizations (emacs -Q).

        John