[Snowcap] Wrong ordering of events when sending messages and operation.

[Ph4ntomas]

Describe the bug

Found this random bug while porting glacier to composable program.

CONTEXT

When my prompt gets activated, I want to immediately focus it.

PRECONDITION

Before the prompt is activated, the widget is not rendered.

Expected behavior

Ideally, I'd need the following order:

1. handle activate message
2. render view
3. focus widget.

Issue

It's possible for 2 & 3 to be swapped, which sometime lead to the focus operation to fail because it arrive before the new view is rendered.

Reproduction steps

N/A

Relevant parts of config

N/A

Version info

Latest master HEAD + a few additional widget

Distro

Arch

GPU

N/A

Config language

Rust

[Ph4ntomas]

The issue exists because messages are asynchronous, while operate call are synchronous.
We could make operate call go through the same channels messages are using. This would make both operation asynchronous, while enforcing a sane ordering, which should fix the issue.

I'll send a patch shortly.