Why selecting text with mouse often doesn't make the text pasteable with mouse mid-button click?

[Yuri]

On 09/18/2011 06:05, Thomas Dickey wrote:
>> >  I notice this again and again: when I select some text in Konsole (KDE4)
>> >  sometimes it doesn't paste with the middle mouse button click.
> Where are you pasting?  (on another terminal emulator, in an application
> running in a terminal emulator, or within another X application)?
>

Test selected in Konsole I usually paste into Konsole. and it fails 
maybe in 5-10% of cases.

Yuri