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I think it's a bug, but now sure if of libstdc++ or the spec, have
opened https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100384 for the gcc
people to comment on

Test plan:
 - removed lib64/plugins/kigpart.so
 - `kig` still works (finds the part on startup)
 - konqueror in filter/tests still allows to preview kig and kgeo files
 - lxr shows no other code loading "kigpart" by name directly

KF6 task: https://phabricator.kde.org/T12340

(cherry picked from commit 1ecaabb8)

(cherry picked from commit 4aa8af66)

(cherry picked from commit 939d97e9)

In an "invalid" test the case of exactly superposed points was not contemplated.
Specifically we also need to cover for the case where norm1 or norm2 is numerically zero.

BUG: 430884

(cherry picked from commit e7dd552c)

* Update date and version numbers
* Change http: to https:
* Add button images
* Some improves and suitable tagging
* Change 	 to tabualtion, capitalization
* Use more entities
* Add @title:window helpers to GUI messages

It turns out the PyEval_* APIs has always been publically exposed but
undocumented; because of this, they were deprecated in Python 3.9.

Switch PyEval_CallObject to PyObject_CallObject, which has been
available for a very long time (even in Python 2.7).

Apparently with Python 3.9 Py_Initialize() is needed even before
creating PyObject's, i.e. what the default constructor of
boost::python:dict does by calling PyDict_New().

Hence, move the insertion of the 'kig' module followed by
Py_Initialize() in the constructor of a separate helper class: this
class will be a private base for PythonScripter::Private, which thus can
properly initialize boost::python objects.

These are used (and deleted) later by the callers.

This is a temporary fix so that it will go into the 20.12 release.
A proper fix as outlined in Comment 3 of the bug report should go to
master.

BUG: 422665
FIXED-IN: 20.12.1

(cherry picked from commit 76bd6db8)

(cherry picked from commit 0640f952)

(cherry picked from commit 46196a81)

(cherry picked from commit 87fdd248)