dock: pinned mode acts as screen split - bar shrinks, corners adjust, opaque background

shell/dock/DockState.qml

@@ -1,29 +0,0 @@
-pragma Singleton
-
-import QtQuick
-
-QtObject {
-    // "closed" | "pinned" | "overlay"
-    property string mode: "closed"
-    readonly property bool open: mode !== "closed"
-
-    function openPinned() {
-        mode = "pinned";
-    }
-
-    function openOverlay() {
-        if (mode === "closed")
-            mode = "overlay";
-    }
-
-    function close() {
-        mode = "closed";
-    }
-
-    function toggle() {
-        if (mode === "pinned")
-            mode = "closed";
-        else
-            mode = "pinned";
-    }
-}