RichTextBox `LinkClicked` event doesn't work for "friendly named" hyperlinks

• .NET Core Version: (e.g. 3.0 Preview1, or daily build number, use dotnet --info)
• Have you experienced this same bug with .NET Framework?: Yes

Problem description:

With the removal of the quirk Switch.System.Windows.Forms.DoNotLoadLatestRichEditControl (https://github.com/dotnet/winforms/pull/1139/commits/3f2ca8a2a3e19ea7431279defcebec14e2ca59ea) we may regress because we will use newer RTB controls (4.0+) and users will no longer be able to load older RTB controls that handled some hyperlinks differently.

Please refer to https://stackoverflow.com/q/56936777/2338036

Actual behavior:

Expected behavior:

Minimal repro:

[Marie-Shi]

Verified this bug with .Net core 3.0.100-rc1-014190 from release branch, RichTextBox LinkClicked event can work for “friendly named” hyperlinks. Please see the following Gif:

[weltkante]

@RussKie considering you said in PR #1661 that Issue #1520 will be fixed by said PR, this issue can’t be a duplicate.

This repros on Desktop Framework and I’d assume it also repros in .NET Core. Since the bug fixed by PR #1661 never existed in Desktop Framework it can’t be the same issue. The problem the stackoverflow article was about is a regression in the Desktop Framework long ago (by updating to a newer version of the RTF control which supported features WinForms doesn’t understand).

I’d recommend to reopen so this can be fixed at some point. Of course you are free to reprioritize, it might not be necessary to fix for 3.0 since it repros on Desktop Framework by default and the only thing you took away is the known workaround to downgrade the RTF control.

(Note for anyone wanting to investigate: the exact location of the bug was already root-caused in the stackoverflow article linked in the issue description, so you don’t need to do that yourself again.)

using System;
using System.Drawing;
using System.Windows.Forms;

public class Form1 : Form
{
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }

    private RichTextBox richTextBox1;

    public Form1()
    {
        richTextBox1 = new RichTextBox();
        richTextBox1.Dock = DockStyle.Fill;
        richTextBox1.LinkClicked += richTextBox1_LinkClicked;
        ClientSize = new Size(640, 480);
        Controls.Add(richTextBox1);
        Load += Form1_Load;
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        richTextBox1.Rtf = @"{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang4105{\fonttbl{\f0\fnil\fcharset0 Calibri;}}
{\*\generator Riched20 10.0.17134}\viewkind4\uc1 
{\field{\*\fldinst { HYPERLINK ""http://www.google.com"" }}{\fldrslt {Click here}}}
\pard\sa200\sl276\slmult1\f0\fs22\lang9  for more information.\par
}";
    }

    private void richTextBox1_LinkClicked(object sender, LinkClickedEventArgs e)
    {
        MessageBox.Show($"link {e.LinkText} clicked");
    }
}