Add config parameter to disable collapsible cursors (#37967)

[KarelCasier]

Fix to issue: #37967

Initial Behaviour:

Disable collapsible cursors in user settings:

{
    "editor.multiCursorCollapsible": false
}

New Behaviour:

[msftclas]

All CLA requirements met.

[alexdima]

Thank you for your contribution!

[brunoscopelliti]

Hey @alexandrudima ,
I'm happy to see this is moving, anyway I seem not to be able to set "editor.multiCursorCollapsible": false. When I try, I get the Unknown configuration settings warning.
Also when I search between the available settings, I get no results for multiCursorCollapsible.

I've just updated vscode to version 1.22.1.
Any thoughts?

[KarelCasier]

Looks like it was renamed: editor.multiCursorMergeOverlapping (which is a much better name 👍)

[brunoscopelliti]

I get the Unknown configuration settings warning also for editor.multiCursorMergeOverlapping.

[alexdima]

@brunoscopelliti You need an insiders build which contains the change. Changes pushed on Friday make their way only to the Monday insiders build (i.e. we don't publish insiders builds on the weekend). There is a build from 4 hrs ago (4971d88) which should contain this change.

[brunoscopelliti]

@alexandrudima Thanks for the clarification.