VsCode: Add loading spinner during autocomplete request on current line

[ruediste]

Description

Add loading spinner during autocomplete request on current line. Can be switched off in the vscode extension configuration.

#925

Checklist

• The relevant docs, if any, have been updated or created

Screenshots

Kazam_screencast_00002.mp4

Testing

Edit some code, watch the loading spinner.
Disable the spinner in the settings, validate the absence of the spinner.

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[sestinj]

@ruediste This is super cool! Makes autocomplete feel more predictable. I made a few small adjustments because I think it's really important that this not be too noisy (removed background and underline, and set false by default)

There are two other things I'd probably like to see before merging:

• An animation that feels less noticeable—both the white color and the spinning are a lot of motion. I think that a light gray (HEX #888888) dot that maybe just very slowly pulses would do the trick
• Right now the spinner is flashing a lot when there's a quick completion. I think that we should only show the spinner if ~200ms have passed and the completion is still loading, and probably should show the spinner for a minimum of ~250ms

[ruediste]

I added the delay and two icons, now with Synfig Studio, an open source 2D drawing/animation software. I did the dot, but the animation continues running in the background, so some times the dot pops up in it's large state, sometimes in it's small state. So I added a slow spinner as well. To me the spinner looks better. Just replace the gif files to see both versions.

Happy to adjust the icons if you have suggestions, I'm not much of a designer ...

Just recognized that I only did the delay, not the minimum display time. I'll do this later, time to call it a day.

[ruediste]

The minimum display time is present as well.