[2.7] bpo-33096: Fix ttk.Treeview.insert. (GH-6228)

[serhiy-storchaka]

Allow ttk.Treeview.insert to insert iid that has a false boolean value.
Note iid=0 and iid=False would be same..
(cherry picked from commit 3ab44c0)

Co-authored-by: Garvit Khatri [email protected]

https://bugs.python.org/issue33096

[jakirkham]

So we ran into an issue compiling ttk.py with Python 2.7 as part of the Python 2.7 build process on Windows. Appears it has some Python 3 syntax in at least one place. Have not looked through the rest of ttk.py or any of the other files, but figured I'd mention it here. Traceback and link to log from the build included below.

C:\bld\python_1525666272216\work\Lib\xml\sax\__init__.py
1994 File(s) copied
        1 file(s) moved.
        1 dir(s) moved.
        1 file(s) moved.
        1 dir(s) moved.
Compiling C:\bld\python_1525666272216\_h_env\Lib\tkinter\ttk.py ...
  File "C:\bld\python_1525666272216\_h_env\Lib\tkinter\ttk.py", line 83
    for *state, val in items:
        ^
SyntaxError: invalid syntax

ref: https://ci.appveyor.com/project/conda-forge/python-feedstock/build/1.0.334

[serhiy-storchaka]

Thank you for your report @jakirkham! Some files unintentionally were copied from Python 3. Will be fixed by #6724.