added wxWindow::GetPrev/NextSibling() [backport of r50108 from trunk]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@50111 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -129,17 +129,17 @@ wxMac:
 - Fixed 'Reopen' application behaviour (a window was not always shown when reopening the app).
 
 
-2.8.6
+2.8.8
 -----
 
-All:
-
-- Fixed another bug in wxFileConfig when deleting entries (Axel Gembe)
-- Added Portuguese translation (Antonio Cardoso Martins)
-
-
 All (GUI):
 
+- Added wxWindow::GetNextSibling() and GetPrevSibling()
+
+
+2.8.7
+-----
+
 - Added an optimization to UI updates on idle, by only updating when the window
   is shown.
 - Multiple centre panes in wxAUI can now be resized.
@@ -164,6 +164,16 @@ wxMac:
 
 - Fixed a crash in wxToolBar when adding tools with non-standard sizes.
 
+
+2.8.6
+-----
+
+All:
+
+- Fixed another bug in wxFileConfig when deleting entries (Axel Gembe)
+- Added Portuguese translation (Antonio Cardoso Martins)
+
+
 2.8.5
 -----