When using the new Office 2019 Light theme in the SyntaxEditor there are no scrollbars displayed in the CompletionList window. Also the list is not scrollable using the scrollwheel. Only when using the arrows on the keyboard.

When using the fluent theme it is working fine.

See attached screenshots.

A programmatically created selection keeps highlighting the following part of the text when its original content is deleted via keyboard.

If there are less characters left than the selection encompassed, further editing will result in unhandled Exceptions.

 Steps to reproduce:

1. Enter multiple lines of text in RadSyntaxEditor
2. Programmatically set Selection.
3. Press [Del] or [Backspace] or [Ctrl-X] to remove the selected Text.