Thank you for reply. Waiting with impatience

Unfortunately I currently use Codeblocks extremly rarely but during last two years there were not any issue reports about codeblocks + wxgtk-3.0-gtk3 (at least I don't remember about them as package maintainer). Therefore this revision in stable branch now.
So Codeblocks 20.xx in gentoo will be with wxGTK-3.0-gtk3 as gentoo wxwidgets team asked to use it for new revisions. Then after wxGTK-3.2-gtk3 release most likely there will be revision for it.