[vscode] support new CompletionItem.range shape

[akosyakov]

What it does

• fix No Typescript suggestions for Typescript files when using builtin version 1.44.2 #7810: support new CompletionItem.range shape

Also don't send:

• duplicate ranges on provide completions
• entire completion back and forth on resolve completion

How to test

• check that completions are provider, detailed information is resolved on info, and properly applied for typescript
• there is no error logging as in the issue

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

[vince-fugnitto]

Thank you for providing a quick fix to the issue 👍
There seems to be CI errors regarding completionItems in the metrics extension:

• https://travis-ci.com/github/eclipse-theia/theia/jobs/334050450#L711

[akosyakov]

@vince-fugnitto should be fixed now

[lmcbout]

@akosyakov The PR does not compile. See the errors reported:
1- packages/plugin-metrics/src/browser/plugin-metrics-languages-main.ts:48:15 - error TS2416: Property 'resolveCompletionItem' in type
2- packages/plugin-metrics/src/browser/plugin-metrics-languages-main.ts:52:66 - error TS2554: Expected 3 arguments, but got 5.
52 super.resolveCompletionItem(handle, model, position, item, token));

3- packages/plugin-metrics/src/browser/plugin-metrics-frontend-module.ts:31:34 - error TS2345: Argument of type 'typeof LanguagesMainPluginMetrics' is not assignable to parameter of type 'new (...args: any[]) => LanguagesMainImpl'.
Construct signature return types 'LanguagesMainPluginMetrics' and 'LanguagesMainImpl' are incompatible.

[akosyakov]

@lmcbout please fetch new changes

[lmcbout]

Tested on UBUNTU 18.04
Looks good, no more loops reported on the console about the "Invalid Completion Item"

[vince-fugnitto]

I confirmed that completion items are now properly populated (ex: when editing a typescript file).