Add cursor property to the desktop super textfield.

[salihgueler]

Fixes #383

Right now the cursor for the default behavior of the SuperTextField is not configurable. For superlist, we would like to use custom cursors on hover to the field when there are no texts and there is no focus.

[matthew-carroll]

Can you accomplish the same effect by wrapping a SuperTextField with a MouseRegion and configuring your cursor style in there?

[salihgueler]

Can you accomplish the same effect by wrapping a SuperTextField with a MouseRegion and configuring your cursor style in there?

Nope, the cursor is absorbed by the SuperTextField.

[matthew-carroll]

@salihgueler instead of taking in a configuration, please try setting the cursor to MouseCursor.defer when the user isn't over text, then try again with your own MouseRegion around the SuperTextField. Please let me know if that works.

Related docs: https://api.flutter.dev/flutter/widgets/MouseRegion/cursor.html

[matthew-carroll]

@salihgueler I saw that @bk-one prioritized the ticket associated with this PR. Can you try the approach that I mentioned in my last comment and let me know if that solves the problem?

[matthew-carroll]

@salihgueler can you try the "defer" approach running in a web browser and let me know if it works there? Based on some experimentation, I think this might be a Mac bug in Flutter.

[matthew-carroll]

I'm going to close this PR due to inactivity. If someone wants to investigate this problem a little deeper, I welcome another attempt to solve this issue.