fix: reset window state after disconnected from multi monitor (janhq#…

…3797)

electron/utils/setup.ts

@@ -1,4 +1,4 @@
-import { app } from 'electron'
+import { app, screen } from 'electron'
 import Store from 'electron-store'
 
 const DEFAULT_WIDTH = 1000
@@ -22,13 +22,42 @@ export const getBounds = async () => {
     height: DEFAULT_HEIGHT,
   }
 
-  const bounds = await storage.get('windowBounds')
-  if (bounds) {
-    return bounds as Electron.Rectangle
-  } else {
+  const bounds = (await storage.get('windowBounds')) as
+    | Electron.Rectangle
+    | undefined
+
+  // If no bounds are saved, use the defaults
+  if (!bounds) {
     storage.set('windowBounds', defaultBounds)
     return defaultBounds
   }
+
+  // Validate that the bounds are on a valid display
+  const displays = screen.getAllDisplays()
+  const isValid = displays.some((display) => {
+    const { x, y, width, height } = display.bounds
+    return (
+      bounds.x >= x &&
+      bounds.x < x + width &&
+      bounds.y >= y &&
+      bounds.y < y + height
+    )
+  })
+
+  // If the position is valid, return the saved bounds, otherwise return default bounds
+  if (isValid) {
+    return bounds
+  } else {
+    const primaryDisplay = screen.getPrimaryDisplay()
+    const resetBounds = {
+      x: primaryDisplay.bounds.x,
+      y: primaryDisplay.bounds.y,
+      width: DEFAULT_WIDTH,
+      height: DEFAULT_HEIGHT,
+    }
+    storage.set('windowBounds', resetBounds)
+    return resetBounds
+  }
 }
 
 export const saveBounds = (bounds: Electron.Rectangle | undefined) => {