Re: M-w, then C-y. C-y inserts text properties that aren't on original.

[Eli Zaretskii]

> Date: Thu, 18 Feb 2010 20:29:02 +0000
> From: Alan Mackenzie <address@hidden>
> 
> In a C++ Mode buffer, I create a region containing a template-opener <,
> M-w it, then C-y it.
> 
> The C-y puts a syntax-table property on the (copy of) the <, but this
> property didn't exist on the original.
> 
> What _was_ on the original was a category property whose symbol had a
> syntax-table property.
> 
> This is the root cause of bug 5570 (indentation messed up in C++).
> 
> Would somebody please suggest the part of Emacs I should be looking at
> to debug this problem.

Can you please give a precise recipe, starting with "emacs -Q", for
reproducing the problem?  I don't know enough about C++ Mode internals
to understand what you say.

Thanks.