Issue #13540: add missing markup.

--HG--
branch : 3.4
Issue #22236: Tkinter tests now don't reuse default root window.  New root
window is created for every test class.

Fixed Tkinter images copying operations in NoDefaultRoot mode.

Tcl command names generated for "after" callbacks now contains a name of
original function.

--HG--
branch : 3.4
Issue #22034: Got rid of misleading error message for bytearray arguments in
posixpath.join().

--HG--
branch : 3.4
fix some test_weakref tests to not rely on ref-counting (closes #22267)

--HG--
branch : 3.4
extra : source : b63b8c5628da906d780207e322083e3c3de3afec
allow test to work on implementations not using ref-counting (closes #22265)

--HG--
branch : 3.4
extra : source : a91f8766f75583d7dc0e6dfebff0fea056f15e56
extra : amend_source : 3d8d60dd8c5c3e8123a878a0bff6e7e18ae271c1