Second built-in radial 'window' bound to MiddleButton: Split Vertical/
Horizontal, Close Split, Close Others, Toggle Orientation, and a Focus
sub-branch (go_left/right/up/down/next/prev_split_view). Leaf ids are
Kate view-manager action objectNames, resolved via findActionByName.
Route a plain middle press (no left held) to the radial dispatch instead
of unconditionally consuming it: the left+middle Cut chord still fires
(left held), and the X11 middle-click primary paste is still suppressed
on release in both paths. Clear m_swallowMiddleRelease when a gesture
consumes the release.
Example config + builtinHasWindowRadialOnMiddleButton test updated.
afedc88ac9