Allow await multiple signals

[acgc99]

I'm currently working on an app. For switching between screens/pages, I would like to do something like this:

await old_page.finished and page.finished

To make sure that the old and new pages are fully loaded before starting the switching animation.

If I type that, I get the warning:

Line 57 (STANDALONE_EXPRESSION):Standalone expression (the line has no effect).

I guess that the second signal is ignored.

This could also be extended with or or complex conditions (just like an if statement).

[AThousandShips]

Thank you for your proposal, closing as a duplicate of:

• Implement or and and in await statements #6243