Support dynamic QuickPickItem items

[joaomoreno]

In order to implement #21439, it would be great to have a QuickPickItem which is never filtered out no matter what the user types. Additionally, it would be aware of what the user has typed when selected.

Proposal 1

export interface QuickPickItem {
  alwaysVisible?: boolean;
}

export interface QuickPickOptions {
  onDidPickItem?<T extends QuickPickItem>(item: T | string, input: string): any;
}

cc @jrieken

[jrieken]

dupe of https://github.com/Microsoft/vscode/issues?q=is%3Aopen+label%3Aquick-pick+label%3Aapi

[joaomoreno]

@jrieken Did you just flush my proposal down the toilet? I'm actually trying to do something here and starting a discussion.

[jrieken]

No. As I have told you this request has been made already a few time, so I wasn't expecting you to create yet another duplicate but use an existing, long-standing issue. For instance these: #21372, #15659, and #11468

[joaomoreno]

All those requests, aside from not fully addressing my issue, bring considerable conceptual changes to the quick pick API. The proposal in this issue is an incremental change.

But I understand if you want to stop any incremental changes in favour of a better thought-out APIv2.