[QScintilla] Background transparency

[Dr. Sam Aaron]

Hi there,

We’re using QScintilla to much success in our live coding system Sonic Pi (http://sonic-pi.net) - Thanks for all your work!

One thing we’re trying to do now is to work on visualisations to go with the music. Our goal is to have a Qt widget displaying the graphics with the other Qt widgets for interaction above the graphics with some transparency.

Unfortunately we don’t seem to be able to make the background of the QScintilla widget transparent to let the widget behind it display through.

Ideally only the background would be transparent and the text opaque.

Has anyone tried this? This is where we’ve been discussing it: https://github.com/samaaron/sonic-pi/pull/747#issuecomment-149632212

Sam