Some apps (e.g. Chromium) explicitly append a \0 to the text they
transmit through the clipboard. Remove that one, when we retrieve the
text, so it doesn't become part of the text we're pasting.
This was e.g. visible when pasting from chromium to the textedit example.
Change-Id: I9445319e6e5ef304a364e14f794b16557a3cc919
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
dcc605beb6