MarkdownTextBlock throw an exception while handling link with space link text

[Tlaster]

Describe the bug

Try rendering markdown like this

[ ](https://www.google.com/)

And the MarkdownTextBlock throw an exception

Steps to Reproduce

Steps to reproduce the behavior:

1. Open Sample App
2. Open MarkDownTextBlock sample
3. Add the following markdown to the textbox at the top:

[ ](https://www.google.com/)

4. Sample App crash

Expected behavior

MarkdownTextBlock render a space

Environment

NuGet Package(s): 
6.0.0
Package Version(s): 
6.0.0

Windows 10 Build Number:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [x] May 2019 Update (18362)
- [ ] Insider Build (build number: )

App min and target version:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [x] October 2018 Update (17763)
- [ ] May 2019 Update (18362)
- [ ] Insider Build (xxxxx)

Device form factor:
- [x] Desktop
- [ ] Xbox
- [ ] Surface Hub
- [ ] IoT

Visual Studio 
- [ ] 2017 (version: )
- [x] 2019 (version: 16.4.4) 
- [ ] 2019 Preview (version: )

[ghost]

Hello Tlaster, thank you for opening an issue with us!

I have automatically added a "needs triage" label to help get things started. Our team will investigate the issue and help solve it ASAP. Other community members may also look into the issue and provide feedback 🙌

[Kyaa-dost]

Hi, @Tlaster I am able to reproduce this as well. That's a good catch! Our developers will certainly look into this and get back to you.

[Kyaa-dost]

@Sergio0694 There was a similar issue that occurred in past #2806. Any thoughts on this?

[azchohfi]

It's not the same issue. This one is a StaskOverflowException.
@WilliamABradley, any idea?

[Kyaa-dost]

@Jasonstein I am still able to reproduce this issue. Is this still being worked on your end?

[0x7c13]

@Kyaa-dost It is fixed on my side in my app:

It is invisible (after rendering empty space) but it will not crash the app.

[tesar-tech]

I also have this issue. Simple link like this: [somehting](https://github.com) will freeze the app when hovering the link. It does not crash (immediately ), it just use more and more of memory (so I guess it's SO exception)?

[Arlodotexe]

I also have this issue. Simple link like this: [somehting](https://github.com) will freeze the app when hovering the link. It does not crash (immediately ), it just use more and more of memory (so I guess it's SO exception)?

@tesar-tech Are you referring to #4385?