Delete and tabs fail together

[GoogleCodeExporter]

What steps will reproduce the problem?
1. start a program like cat in a mintty session
2. type a line with lots of tabs
3. try backspacing; hilarity ensues.

What is the expected output? What do you see instead?
A tab should be deleted as a unit, not converted to 8 spaces, otherwise the 
screen no longer reflects the program state.  For example, consider the 
following 3 line transcript.
$ cat
0       1       2       3       4       5       6     eh?
eh?

What versions of mintty, Cygwin/MSYS, and Windows are you using?
mintty 1.1.3

Please provide any additional information below.

Original issue reported on code.google.com by Mark...@gmail.com on 7 Sep 2014 at 2:30

[GoogleCodeExporter]

My apologies, this seems to be a Cygwin issue, not mintty.

Original comment by Mark...@gmail.com on 7 Sep 2014 at 3:03