Allow customisation of debug toolbar (eg. additional buttons)

[DanTup]

In Flutter (a framework for developing mobile apps) we have two different types of restart during debugging:

1. Stateful Hot Reload
2. Full Restart

Since stateful hot reload is awesome, we've wired that up to the Restart button on the toolbar. In the case where this fails (eg. because you modified something that makes your state invalid) we have a status bar notification and an action in the command palette for a "Full Restart".

This has been a little confusing for users - they expect to see buttons for "Hot Reload" and "Restart" on the toolbar.

It would be great if we could supply an icon/tooltip for additional buttons (and a way of positioning them between existing buttons) and have it run a custom command.

[isidorn]

This is a fair feature request.
We already have the editor title area where extensions can contribute actions and icons
Here's an example of markdown doing it.

So we would need to introduce a new menu id for the debug toolbar. For example 'debug/actionBar' - since we already call it actionbar in settings.
Positioning would be done by using the "group" property, so nothing new to introduce for this.

A nice thing about this is that we would be able to remove the chakra actions which do not really belong in the vscode core imho.

[weinand]

@isidorn Sorry, but there are no "chakra actions". The debug protocol supports reverse-back and reverse-continue and VS Code surfaces that in the UI. VS Code does not know anything about chakra (and the comment is wrong). Any debug extension can use that. So there is no way that we ever remove support for this.

[DanTup]

Reverse continue?! That sounds bizzare!

So we would need to introduce a new menu id for the debug toolbar. For example 'debug/actionBar'

I was actually thinking this would work by sending a customRequest or similar to the DA (so it's similar to restartRequest), though since we have two-way communication between UI and DA now it doesn't worry me too much how it'd work.