This allows compiling extension modules with -Wswitch-enum on gcc.
Initial patch by Floris Bruynooghe.

#4147: minidom's toprettyxml no longer adds whitespace around a text node when it is the only child of an element.  Initial patch by Dan Kenigsberg.

(the encoder already accepts them).

(backport of 6b9f547e92d8)

Remove a sleep to fix transient test failures. Use skewfactor of -3 to
make it work on systems that have 1 second precision for time.time().

Closes #11999
Refs #13254

when called with a timeout.  Patch by Arnaud Ysmal.

Issue #13237: Fix formatting error - the legacy shell commands weren't meant to be under the Notes heading

Issue #13237: Forward port subprocess module updates and explicitly document UTF-8 encoding assumption when universal_newlines=True