Method refreshUsableAreaLayout

packages/config/src/window-manager.ts:3163–3191

()

    const output = COMPOSITOR.output.current[monitor];
    const ox = output?.position.x ?? 0;
    const oy = output?.position.y ?? 0;
    this.snapPreviewBroadcaster({
      monitor,
      kind,
      rect: {
        x: read(rect.x) - ox,
        y: read(rect.y) - oy,
        width: read(rect.width),
        height: read(rect.height),
      },
    });
  }

  /** Update the floating-drag snap candidate + preview during a move. */
  private updateFloatingDragSnap(event: WindowMoveEvent) {
    if (event.modifiers.shift) {
      this.clearFloatingSnapPreview();
      return;
    }
    if (event.phase === "start") {
      this.clearFloatingSnapPreview();
      return;
    }
    if (event.phase === "end" || event.phase === "cancel") {
      return;
    }

    const monitor =
      event.outputName && COMPOSITOR.output.list.includes(event.outputName)
        ? event.outputName
        : this.currentMonitor;
    const zone = monitor