tab replace to space 4

[Terry Reedy]

On 11/29/2019 3:05 PM, R.Wieser wrote:
> Terry,

> Its just that I've just began to touch tkinter, and would like to know of
> bug-related pitfalls before I waste energy on trying to figure out what I
> did wrong. :-\

I have been using tk/tkinter based IDLE for over a decade on Windows 
with very few issues.  I think they are similarly stable on linux, etc.

macOS has been more problematical since Apple a) still provides the 
ancient (15 years old?) and buggy tcl/tk 8.5.9 and b) keeps changing 
things in its Aqua graphics, so that different tk releases has different 
bugs.  tcl/tk on macOS has gotten lots of work in the last few years and 
the devs claim that the brand new 8.6.10 should solve most of the 
problems.  Since 8.7.0, our macOS installer has included a recent 8.6.x. 
  It is possible that the upcoming 3.8.1 will include tk 8.6.10 if our 
tests verify the claims.

-- 
Terry Jan Reedy