[Bug gdb/21506] python execute(to_string=True) no longer captures certain output since e7ea3ec7

["tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21506

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-09-03
                 CC|                            |tromey at sourceware dot org
     Ever confirmed|0                           |1

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I've also noticed this when using my python gdb gui -- 
the gui uses to_string=True for some commands to suppress output,
but gdb still emits the output anyway now.

For example in my case it happens in tui_on_normal_stop, which
calls print_stop_event for each UI.

I'm not sure what can be done about this.  if nothing, it's worth
noting that the output is sub-par as well:

(top) 30          args.argv = argv;
31        args.interpreter_p = INTERP_CONSOLE;


... that is, it doesn't try to erase the prompt first.

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