Provide a way to retrieve the name of the current system appearance
(mostly for diagnostic purposes) and check if it uses predominantly dark
colours.
Currently this class has a non-trivial (but still very simple)
implementation under macOS only and simply checks whether the default
text colour is brighter than the default background colour under the
other platforms, but other platform-specific implementations could be
added later.
Also update the drawing sample "system colours" page to show the system
appearance as well.
This keyword is not expanded by Git which means it's not replaced with the
correct revision value in the releases made using git-based scripts and it's
confusing to have lines with unexpanded "$Id$" in the released files. As
expanding them with Git is not that simple (it could be done with git archive
and export-subst attribute) and there are not many benefits in having them in
the first place, just remove all these lines.
If nothing else, this will make an eventual transition to Git simpler.
Closes#14487.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74602 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1) Renamed to GetScreenType (so that the name better describes its function)
2) Changed use of <,>,<=,>= operators together with wxSYS_SCREEN_* so that
'foo is smaller that bar' is written as 'foo < bar' and not (sic) 'foo > bar'
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15607 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
