Via arrow right or mouse middle button.

fixes #92324

This reverts commit 6c9b23ed, reversing
changes made to 085abd5f.

Summary:
Address issue #73904 by adding an optional `sortByLabel` to the QuickPick class which determines whether the picker re-sorts the result list when the user types in the input field.

If true, the picker applies a sort to order results by the index of the first appearance of the input in the label.

For backwards compatibility, this field is true by default.

https://github.com/microsoft/vscode/issues/73904

Test Plan:
attached video shows behavior both before and after

{F167292605}

note: there aren't any existing tests on what happens when the query input changes in the QuickPick

Reviewers: dalongi, ericblue, hchau

Reviewed By: ericblue

Differential Revision: https://phabricator.intern.facebook.com/D16203434

Signature: 16203434:1562878837:5413e3852f2bd04c8e81b9fe5c4a08127dfe3b65

Use an empty string instead of null for reseting styles

Emitters should generally not be reassigned as their corresponding event would also be lost. Marking these as readonly just to enforce this

#77747