QML BorderImage fails if .sci file contains an url

.sci file parsing fails if the source attribute contains an url. This is a big problem especially if you want to use a custom image provider .sci files (currently impossible).

The precise place of the problem is here (qdeclarativescalegrid.cpp):

QDeclarativeGridScaledImage::QDeclarativeGridScaledImage(QIODevice *data)
...
QStringList list = line.split(QLatin1Char(':'));
if (list.count() != 2)
return;

--> Will fail if the url contains a colon.

Here's a solution proposal (replace the above lines with these):

int colonId = line.indexOf(QLatin1Char(':'));
if (colonId < 0)
return;
QStringList list;
list.append(line.left(colonId));
list.append(line.mid(colonId+1));