fix(overlay): Linux X11/XWayland stacking, stale pause state, multi-copy selector (#101)

src/main/runtime/linux-overlay-window-shape.ts

@@ -0,0 +1,53 @@
+export type LinuxOverlayShapeRect = {
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+};
+
+export type LinuxOverlayShapeWindow = {
+  isDestroyed: () => boolean;
+  getBounds?: () => LinuxOverlayShapeRect;
+  setShape?: (rects: LinuxOverlayShapeRect[]) => void;
+};
+
+function toPositivePixel(value: number): number | null {
+  if (!Number.isFinite(value) || value <= 0) {
+    return null;
+  }
+  return Math.max(1, Math.round(value));
+}
+
+export function buildFullWindowShapeRect(
+  bounds: LinuxOverlayShapeRect,
+): LinuxOverlayShapeRect | null {
+  const width = toPositivePixel(bounds.width);
+  const height = toPositivePixel(bounds.height);
+  if (width === null || height === null) {
+    return null;
+  }
+
+  return {
+    x: 0,
+    y: 0,
+    width,
+    height,
+  };
+}
+
+export function restoreLinuxOverlayWindowShape(window: LinuxOverlayShapeWindow | null): boolean {
+  if (!window || window.isDestroyed()) {
+    return false;
+  }
+  if (typeof window.setShape !== 'function' || typeof window.getBounds !== 'function') {
+    return false;
+  }
+
+  const rect = buildFullWindowShapeRect(window.getBounds());
+  if (!rect) {
+    return false;
+  }
+
+  window.setShape([rect]);
+  return true;
+}