[QScintilla] Selected text is deleted when focus is lost

[Federico]

Hi,
I am currently using QScintilla for a personal project, and I've
encountered a problem which I was not able to fix.   First, some
information:  I'm using QScintilla v2.8, Qt v5.2.1 and GCC 4.8.2 to
compile, (system: Linux 3.13.5, w/ GNOME 3.10).

The problem: whenever I select some text on a QsciScintilla widget, if I
interact with another widget, the selected text is erased.

I tried implementing a quick fix:  I reimplemented QsciScintilla's
"focusOutEvent(QFocusEvent*)" function to unset the selection when it was
called (by calling setSelection(0, 0, 0, 0) ).  This fix only works on some
cases: for example, clicking on a button in the Menu bar no longer deletes
the selection, but clicking on the window's title bar still does.

I was wondering if I am not using the QsciScintilla class correctly, or if
this is a bug.

Thanks,
Federico
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