Terry J. Reedy added the comment:

Experiments with colorizer debugger on: with auto popup disabled with a 
long wait, output for each character entered is (except for time variations) 
the following, regardless of quotation.
  schedule colorizing
  colorizing...
  0.002 seconds

If I type "'/" <tab> for box 'G', I see
  schedule colorizing
  colorizing ...
but no completion time.  An immediate 'a' is not colored and produces 
  stop colorizing
  schedule colorizing
  already colorizing

However, if after entering G, I shift focus off the window, but clicking 
another window or opening and closing About IDLE, the colorizing completes and 
I see a time, such as
  41.480 seconds
and following chars are colorized.  If instead, I enter 'a' quickly and then do 
the shift, I see something like
  colorizing stopped
  58.904 seconds
and 'a' turns to green, as it should have without the delay.

Neither of the autocomplete files import colorizer (at least not directly), but 
the completion box somehow affects colorizing, perhaps through affecting the tk 
loop.

If I start with ''' instead of ', the debug output for post-box 'ga' is the 
same, but 'a' and subsequent chars are colored anyway.

autocomplete imports hyperparser. but I do not immediately see any asymmetry 
there or in the autocomplete files to explain why '('') and "("") are treated 
differently.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27675>
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