Test Multiline diagnostics

[sandy081]

Testing: #1927

• anyOS @rebornix
• anyOS @chrmarti

Complexity: 3

• Create a simple extension that generates multi-line diagnostics and verify that the Problems view show the diagnostic message in multiple lines. You can also toggle to show the message in multiple lines or single line in the view.

• Play around with problems view by generating different types of diagnostics

Sample extension code:

'use strict';

import * as vscode from 'vscode';

export function activate(context: vscode.ExtensionContext) {
    const diagnosticsCollection = vscode.languages.createDiagnosticCollection('test');
    vscode.window.onDidChangeActiveTextEditor(e => {
        if (e && e.document) {
            const diagnostics: vscode.Diagnostic[] = [];
            let message = "this is a message with multiple lines. \nLine 1\nLine2\nLine3";
            const diagnostic = new vscode.Diagnostic(new vscode.Range(new vscode.Position(10, 1), new vscode.Position(10, 10)), message, vscode.DiagnosticSeverity.Error);
            diagnostic.source = 'test';
            diagnostic.code = '1234';
            diagnostic.relatedInformation = [];
            diagnostics.push(diagnostic);
            diagnosticsCollection.set(e.document.uri, diagnostics);
        }
    });
}

Or use the following typescript code that has a multiple line diagnostic

interface foo {
	a: string;
}

interface bar extends foo {
	a: number;
}