RichEditBox: setting Link property to a zero width space range crashes the app

[FrayxRulez]

Describe the bug I have a chat application where I use a RichEditBox to compose messages. Once sent, messages including a link will generate a preview for the webpage, hence it is a common practice for users to use a zero width character as the display text for the link, to get the preview without the url being visible in the message itself. Now the problem is: if I try to set Link property to a ITextRange containing only a ZERO WIDTH SPACE (0x200B) the app will crash due to a catastrophic failure.

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'

Expected behavior

Screenshots

Version Info

NuGet package version:

Windows app type:	UWP	Win32

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop
Xbox
Surface Hub
IoT

Additional context

[FrayxRulez]

Same applies to a wide variety of character, including space.

[github-actions[bot]]

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[tipa]

Still crashing

[FrayxRulez]

Here’s the list of all the characters that cause a crash:

private static readonly char[] _unsafeChars = new[]
{
    '\u0000', '\u0001', '\u0002', '\u0003', '\u0004', '\u0005', '\u0006', '\u0007', '\u0008',
    '\u0009', '\u000a', '\u000b', '\u000c', '\u000d', '\u000e', '\u000f', '\u0010', '\u0011',
    '\u0012', '\u0013', '\u0014', '\u0015', '\u0016', '\u0017', '\u0018', '\u0019', '\u001a',
    '\u001b', '\u001c', '\u001d', '\u001e', '\u001f', '\u0020', '\u007f', '\u0080', '\u0081',
    '\u0082', '\u0083', '\u0084', '\u0085', '\u0086', '\u0087', '\u0088', '\u0089', '\u008a',
    '\u008b', '\u008c', '\u008d', '\u008e', '\u008f', '\u0090', '\u0091', '\u0092', '\u0093',
    '\u0094', '\u0095', '\u0096', '\u0097', '\u0098', '\u0099', '\u009a', '\u009b', '\u009c',
    '\u009d', '\u009e', '\u009f', '\u00a0', '\u0600', '\u0601', '\u0602', '\u0603', '\u06dd',
    '\u070f', '\u1680', '\u17b4', '\u17b5', '\u180e', '\u2000', '\u2001', '\u2002', '\u2003',
    '\u2004', '\u2005', '\u2006', '\u2007', '\u2008', '\u2009', '\u200a', '\u200b', '\u200c',
    '\u200d', '\u200e', '\u200f', '\u2028', '\u2029', '\u202a', '\u202b', '\u202c', '\u202d',
    '\u202e', '\u202f', '\u205f', '\u2060', '\u2061', '\u2062', '\u2063', '\u2064', '\u206a',
    '\u206b', '\u206c', '\u206d', '\u206e', '\u206f', '\u3000', '\ufdd0', '\ufdd1', '\ufdd2',
    '\ufdd3', '\ufdd4', '\ufdd5', '\ufdd6', '\ufdd7', '\ufdd8', '\ufdd9', '\ufdda', '\ufddb',
    '\ufddc', '\ufddd', '\ufdde', '\ufddf', '\ufde0', '\ufde1', '\ufde2', '\ufde3', '\ufde4',
    '\ufde5', '\ufde6', '\ufde7', '\ufde8', '\ufde9', '\ufdea', '\ufdeb', '\ufdec', '\ufded',
    '\ufdee', '\ufdef', '\ufeff', '\ufff9', '\ufffa', '\ufffb', '\ufffc', '\ufffe'
 };