Focus region using transparency

[Mirko-von-Leipzig]

I'm interested in focussing on the current scope I'm in by de-emphasizing the rest of the code by fading it out. The scope can be widened or narrowed as well.

What I was thinking was:

• Config item to specify the amount of transparency the out-of-scope code gets. One could complicate this by specifying different amounts for each scope jump but that seems unecessary.
• Shortcuts / commands to enable/disable focus mode
• Shortcuts / commands which widen/narrow the scope while in focus mode.

When entering focus mode only the current scope if emphasized e.g. the current loop. You could then widen the scope by one level to include the surrounding function.

I don't know what the behaviour should be when one leaves the scope. Should it just return to single level scope? Should it keep the number of scope levels? Probably something one has to experiment with.

Emacs has a similar narrowing feature which I have not used; but looks quite clumsy since it hides the rest of the code entirely (afaiu) by creating a new buffer instead.