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Don't send alpha channel if pixmap has none

Kai Uwe Broulik requested to merge work/kbroulik/rgb-noti-pixmap into master

Most notifications use icon names, so if an application uses a pixmap it's most likely a person's profile picture JPEG. Not sending alpha channel here saves on DBus traffic and RAM in Plasma's notification model.

...
noti->setPixmap(QPixmap("foo.jpg"));
...

It's part of the spec and supported by Plasma. Both JPG without alpha and PNG with alpha still render fine.

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