Provide forward-compatible {Left,Middle,Right}IsDown() accessors.

Allow using the same code using XXXIsDown() to work with both 2.8 and 2.9
without provoking deprecation warnings with the latter for XXXDown().

Closes #11382.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@62544 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/utils.h

@@ -229,6 +229,12 @@ public:
     bool        MiddleDown()  { return m_middleDown; }
     bool        RightDown()   { return m_rightDown; }
 
+#if wxABI_VERSION >= 20811
+    bool        LeftIsDown()    { return m_leftDown; }
+    bool        MiddleIsDown()  { return m_middleDown; }
+    bool        RightIsDown()   { return m_rightDown; }
+#endif // wx >= 2.8.11
+
     bool        ControlDown() { return m_controlDown; }
     bool        ShiftDown()   { return m_shiftDown; }
     bool        AltDown()     { return m_altDown; }

version-script.in

@@ -33,6 +33,7 @@
         *wxDC*SetDeviceClippingRegion*;
         *wxGraphicsContext*GetCairoRenderer*;
         *wxIconizeEvent*IsIconized*;
+        *wxMouseState*IsDown*;
         *wxRichTextCtrl*GetContextMenu*;
         *wxRichTextCtrl*SetContextMenu*;
         *wxShowEvent*IsShown*;