When trying to determine the indentation for non-empty lines, skip back
past empty lines when trying to find the previous indentation.
This prevents code from being inserted at 0 when pasting in below empty
lines.
Change-Id: I6e13e4146e6637180142c0e0b3f9cdafa89df3e5
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: hjk <hjk@qt.io>