Add support for wrapping images in links

[nmetulev]

I'm submitting a...

• Feature request (UserVoice request: )

Current behavior

• An image can not be wrapped in a link - the following is not supported:
  [![image](https://avatars0.githubusercontent.com/u/711864)](https://github.com/nmetulev)
• Images are not focusable and the cursor does not indicate a clickable area

Expected behavior

• Support for linked images
• Images are focusable and cursor changes to a hand on hover

This is supplementing #1091 and #1807

[avknaidu]

@nmetulev @WilliamABradley @skendrot

Support for linked images this is completed.

For second Point, The main issue is when the IsTextSelectionEnabled is true on MarkdownTextBlock the cursor always is "Selection". I tried using below solutions.

1. PointerEntered event by changing IsTextSelectionEnabled to false and then setting Cursor to Hand. ( Does not work )
2. PointerEntered and PointerExited event by changing IsTextSelectionEnabled to false/true respectively and cursor to Hand/Arrow respectively ( Does not work )
3. PointerEntered and PointerExited event by not changing IsTextSelectionEnabled and only changing cursor to Hand/Arrow respectively ( Does not work ).

Keep in mind that I did this on whole Renderer itself by checking e.OriginalSource as Image and also on Image itself while rendering it. Either ways, Hand Cursor will just flicker and will be back to the way it was before.

If anyone has any pointers on how this can be handled, it would be very helpful.

[nmetulev]

This is amazing. If you already have the first one implemented, I'd suggest you submit the PR for that one and lets review it :)

On the second one, curious if our Mouse extension would help here?

[avknaidu]

New PR created for first feature. I have tried using Mouse Extension also but the cursor just flicks and goes away to selector. Happens the same when IsTextSelectionEnabled is false also. If anyone has any ideas, please comment below.

[avknaidu]

While working on this PR, i noticed that Images can be wrapped into HyperlinkButton Content and then Mouse Pointer will show a Hand instead of a selection. Do you think its a Good idea?

[nmetulev]

Interesting, I wonder why we didn't consider that before. Will the image still work as before?

[avknaidu]

Yes. I can create a branch with the default content and you can check for yourself.