This is a bug. Could you submit a bug report from Wing's help menu?
On 2/14/17 12:07 AM, LJR via wingide-users wrote:
> When I create a block line ahead of some text I want to indent like so:
> and press the tab key I get this:
> The text has moved the wrong way and I get an error.
> When I press cntl z to undo I get this:
> The text moves back to where it was but there's an error.