bug#35316: 26.2; Emacs lags in c++-mode buffer when editing with iedit-mode on

[Alan Mackenzie]

Hello, Amos.

On Fri, May 17, 2019 at 09:19:11 +0800, Amos Bird wrote:

> Hello, this patch works as expected. Is there any similar 
> technique I can apply to undo-tree? After modifying hundreds of 
> copies using iedit, doing undo/redo freezes for several minutes.

Whoa there!

Are we still talking about C++ Mode (or one of the other modes in the CC
Mode family)?  How big is your file?  Can you characterise it in any way?
For example, does it contain lots of, or big, raw strings?

I noticed yesterday on a C++ test file with a very long raw string, that
although editing copies of a string segment (using iedit) was fast, undo
afterwards was very slow indeed (~1 minute).

So, perhaps your problem is the same as mine.  Perhaps you have
encountered a different problem.  It seems I have more work to do on this
in any case.

So, details, please!

> regards,
> Amos

[ .... ]

> --
> Amos Bird
> amosbird@gmail.com

-- 
Alan Mackenzie (Nuremberg, Germany).