Fix the screen become black on closing Boostnote when a state of Boostnote is fullscreen on mac

lib/main-window.js

@@ -40,12 +40,20 @@ mainWindow.webContents.sendInputEvent({
 
 if (process.platform !== 'linux' || process.env.DESKTOP_SESSION === 'cinnamon') {
   mainWindow.on('close', function (e) {
+    e.preventDefault()
     if (process.platform === 'win32') {
       mainWindow.minimize()
     } else {
+      if(mainWindow.isFullScreen()){
+        mainWindow.once('leave-full-screen', function () {
+          mainWindow.hide()
+        })
+        mainWindow.setFullScreen(false)
+      }
+      else{
         mainWindow.hide()
       }
-    e.preventDefault()
+    }
   })
 
   app.on('before-quit', function (e) {