[plugin] Fix ignoreFocusOut parameter for the QuickPick

[vinokurig]

What it does

Pass ignoreFocusOut parameter to QuickOpenService on showQuickPick API function.

fixes #5882

How to test

1. Open https://github.com/microsoft/vscode-extension-samples/tree/master/quickinput-sample project
2. Add ignoreFocusOut: true, after line https://github.com/microsoft/vscode-extension-samples/blob/5fb626a4e383c41b8878f94045cff987b92b6bca/quickinput-sample/src/basicInput.ts#L14
   and build the plugin.
3. Start the plugin, launch F1 => Quick Input Samples => showQuickPick

The opened quick-pick must be visible after clicking to the area out of the widget.

Without the fix the quick pick widget hides after clicking to the area out of the widget, even if the ignoreFocusOut parameter is set.

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

[akosyakov]

Start the plugin, launch F1 => Quick Input Samples => showQuickPick

What should we expect to get what was not working before?

[vinokurig]

updated the description with old behavior

[vince-fugnitto]

It works correctly 👍

I tested against master using the extension you mentioned and the quickPick is dismissed when
the area around it is clicked. With your change, I can see that the quickPick is preserved when clicking outside it's area.

[tetchel]

Works for QuickPick. I would like to see the same change for InputBox :)

[akosyakov]

@vinokurig how hard is to apply to input box? Could it be done in this PR?

[vinokurig]

@akosyakov It should already work with InputBox, I've tested it by modifying the input-box action in the vscode quick-input sample.

[akosyakov]

@tetchel #5882 can be closed with this PR according to #5900 (comment), right? Could you provide a reproducible example if it does not work?

[tetchel]

confirmed it does work for inputbox. sorry, from the PR description i assumed it was quickinput only. So this does fix #5882

[akosyakov]

@vinokurig please merge