#1091 Add / Remove Block Comment adds one space char in each line

[Christoph Tapler]

If I mark some Python source code and select "Add Block Comment" and after that I select "Remove Block Comment", the source code is shifted by one space.
Which generates compiler warnings, because the alignment doesn't fit any more. One has to manually remove the space in each line to revert to the original code.
My Editor Settings:
- Replace spaces with tabs
- Tab length: 4