fix running on GTK < 2.10 when built with later, broken in r72935

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77026 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix wxDC::DrawRectangle() when using RTL in wxMSW.

Extend the correct edge of the rectangle (always the physical right, not the
logical right) to fix off by one errors in RTL mode, affecting notably wxGrid.

See #16250.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77028 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove dynamic loading of GDI functions from wxMSW wxDC code.

All of these functions (AlphaBlend(), SetLayout(), SetWorldTransform(), ...)
are available in XP which is the minimally required version.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77029 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix markup on the preprocessor symbols documentation page.

Due to an apparent bug in Doxygen 1.8.2 (the version currently used for the
online documentation generation), using "@c __FOO__" not only renders __FOO__
in fixed width font, but also makes it bold (due to bad interaction with
Markdown support?), so use <tt>__FOO__</tt> instead to work around this.

And in one case, escape underscores explicitly (in __VISUALC7__) as they were
still interpreted, even inside <tt>.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77030 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
using common implementation avoiding out-of-order redraws

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77031 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
fixing background style 

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77032 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Merge remote-tracking branch 'remotes/upstream/master' into power_keepalive
Added documentation for wxPowerResource related classes