Issue #26386: Fixed ttk.TreeView selection operations with item id's

containing spaces.

diff --cc Lib/tkinter/ttk.py
Simple merge

diff --cc Misc/NEWS
index 0238f373144d0803688f863dbd097159b83d86a1,eb810d00e1764c568c0a801d1df4c6c84d5c64b9..60d90aec2c3cc5e6316b19f997f7acc7b25f914d
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,9 -13,9 +10,12 @@@ What's New in Python 3.6.0 alpha 
  Library
  -------
  
+ - Issue #26386: Fixed ttk.TreeView selection operations with item id's
+   containing spaces.
+ 
 +- Issue #8637: Honor a pager set by the env var MANPAGER (in preference to
 +  one set by the env var PAGER).
 +
  - Issue #22636: Avoid shell injection problems with
    ctypes.util.find_library().