Add more functions for manipulating wxImage colours.
Show using them in the same and add new unit tests for them.
This is a squashed commit of branch 'tomay3000/image-lightness'.
Closes https://github.com/wxWidgets/wxWidgets/pull/2310
No real changes, just use the same _PropertySheetDisplayName element as
the standard style sheets use to show a slightly more user-friendly
label in the Property Sheet manager window in MSVS.
Python package hosting seems to randomly decide which version of the
package to return to pip running under Trusty: in addition to werkzeug
(see last commit), the version of flask has spontaneously changed from
1.0 to 1.2 in the latest build too.
Just hardcode the versions of all dependencies in the last successful
build and hope they keep working for longer than a day.
Crazily, pip installs seem to be non-deterministic as installing httpbin
in https://travis-ci.org/github/wxWidgets/wxWidgets/jobs/765946720
pulled in werkzeug 0.16.1 which works with Python 3.4, but doing it
again tries to use werkzeug 1.x which isn't.
Fix the version explicitly to work around this.
Trying to use Python 2 under Trusty is hopeless, as pythonhosted.org has
already started dropping support for non-SNI clients and will drop it
completely soon, see https://status.python.org/incidents/hzmjhqsdjqgb
and https://github.com/pypa/pypi-support/issues/978, and SNI is not
available in the system Python 2 version (2.7.6, which is less than
2.7.9 in which it was added).
Note that we still can't use Python 3 everywhere as long as we have
macOS 11 builds as it's not available there.
Amazingly, updating a package has no problems with installing a newer
version incompatible with the current Python version, such as installing
pip 21 when using Python 3.5.
Somehow installing decorator==4.4.2 worked a few times, but then stopped
and now fails with
Could not find a version that satisfies the requirement
decorator==4.4.2 (from versions: )
No matching distribution found for decorator==4.4.2
Try using explicit URL.
Make ASAN CI job work again under Ubuntu Focal, disabling leak detection
if we fail to install the required dbgsym packages (as happens right
now).
Closes https://github.com/wxWidgets/wxWidgets/pull/2290
There just doesn't seem to be any way to make this work right now, so
handle dbgsym packages installation failure and disable leak detection
in this case.
Hopefully ddebs.ubuntu.com repository will be updated in the future,
allowing this to work again.
Add -dbgsym packages to extra_deps and pass them to the same apt-get
command we use for installing all the other dependencies.
This is slightly faster and also makes it simpler to pass extra options
to apt-get, as we're going to do in the next commit.
This check didn't work in configure when using C++17 or later, as
std::bind2nd() is removed in C++17 and so was worse than useless as it
actually prevented --enable-stl from working.
And while it was only done when using C++98 in CMake, it still seems
pretty useless there too as there should be no environments in which
basic stuff like std::vector<> or std::find_if() is not available.
So just remove it entirely.
