Bug: `setRichTextEditing` will reset the caret position

[AndroidDeveloperLB]

Steps:

1. write some text.
2. cause setRichTextEditing to set to a new text, can even be the same as what you wrote.

The bug: The caret gets reset to position 0, even though it was in a different position.

Attached sample project and video to show the issue: RTEditTextTest.zip

The sample has menu items for saving the content and loading it.