艦これウィジェットのbackground updateのアラート機能（未採用）

update-alert.diff

diff --git a/src/js/Components/Routine/LaunchPositionRecorder.js b/src/js/Components/Routine/LaunchPositionRecorder.js
index a90594c9..9ba72a9c 100644
--- a/src/js/Components/Routine/LaunchPositionRecorder.js
+++ b/src/js/Components/Routine/LaunchPositionRecorder.js
@@ -5,19 +5,32 @@ export default class LaunchPositionRecorder {
     this.context = context;
   }
   mainGameWindow(delay) {
-
-        // contextがiframe内（parentを持ってる）なら、parentにやらせる
-    if (this.context != this.context.parent) return;
-
-    this.interval = setInterval(() => {
-      this.client.message("/launchposition/:update", {
-        left: this.context.screenX,
-        top:  this.context.screenY,
-        architrave: { // エアロ領域とか言われる部分の大きさも記録しとく
-          x: this.context.outerWidth  - this.context.innerWidth,
-          y: this.context.outerHeight - this.context.innerHeight,
-        }
-      });
-    }, delay);
+    // contextがiframe内（parentを持ってる）なら、parentにやらせる
+    if (this.context != this.context.parent) return Promise.resolve();
+    return new Promise((resolve, reject) => {
+      this.interval = setInterval(() => {
+        this.client.message("/launchposition/:update", {
+          left: this.context.screenX,
+          top:  this.context.screenY,
+          architrave: { // エアロ領域とか言われる部分の大きさも記録しとく
+            x: this.context.outerWidth  - this.context.innerWidth,
+            y: this.context.outerHeight - this.context.innerHeight,
+          }
+        }).catch(err => reject(err));
+      }, delay);
+    });
   }
+  static disconnectedMessage = [
+    "艦これウィジェットが更新されたので、",
+    "この窓とChrome拡張のbackgroundとの接続が切れたっぽいです。\n\n",
+    "ユーザ各位はご存知のとおり、『艦これウィジェット』は",
+    "ゲームと接続はもともと一切してないので、",
+    "ゲームへの影響はありません。\n\n",
+    "Chrome拡張のbackgroundとの接続が切れているので、",
+    "スクショのショートカットキーとかが効かなくなってるはずです。\n\n",
+    "日頃からスクショショートカットキーを使っている方は、ウィジェットを",
+    "一回閉じてもっかいLAUNCHするのがいいと思います。",
+    "なお、スクショボタンや、ダッシュボードからのスクショは有効なので、今出撃中とかで",
+    "窓をリロードできないけどスクショとりたい場合はそっち使ってください。",
+  ].join("");
 }
diff --git a/src/js/entrypoints/pages/dmm.js b/src/js/entrypoints/pages/dmm.js
index 4b6254f1..ea32fae4 100644
--- a/src/js/entrypoints/pages/dmm.js
+++ b/src/js/entrypoints/pages/dmm.js
@@ -3,8 +3,6 @@ import ExtractFlash from "../../Components/Routine/ExtractFlash";
 import {DecorateDMMPage} from "../../Components/Routine/DecoratePage";
 import LaunchPositionRecorder from "../../Components/Routine/LaunchPositionRecorder";
 
-chrome.runtime.connect();
-
 import {Client} from "chomex";
 const client = new Client(chrome.runtime);
 client.message("/window/should-decorate").then((res) => {
@@ -28,7 +26,9 @@ client.message("/window/should-decorate").then((res) => {
   case FRAME_SHIFT:
     DecorateDMMPage.init(window).decorate(res.tab.frame);
     client.message("/window/zoom:set", {zoom: res.tab.frame.zoom});
-    (new LaunchPositionRecorder(client)).mainGameWindow(60 * 1000);
+    (new LaunchPositionRecorder(client)).mainGameWindow(15 * 1000).catch(() => {
+      window.alert(LaunchPositionRecorder.disconnectedMessage);
+    });
     client.message("/config/get", {key:"alert-on-before-unload"}).then(({data}) => {
       if (data.value) onBeforeUnloadFuncs.push(() => true);
     });
diff --git a/src/js/entrypoints/pages/dsnapshot.js b/src/js/entrypoints/pages/dsnapshot.js
index 38f53bc1..ada1701b 100644
--- a/src/js/entrypoints/pages/dsnapshot.js
+++ b/src/js/entrypoints/pages/dsnapshot.js
@@ -1,8 +1,6 @@
 import {Client, Router} from "chomex";
 import DamageSnapshotDisplay from "../../Components/Routine/DamageSnapshot";
 
-chrome.runtime.connect();
-
 const client = new Client(chrome.runtime);
 
 let snapshot = new DamageSnapshotDisplay(client);
diff --git a/src/js/entrypoints/pages/osapi.dmm.js b/src/js/entrypoints/pages/osapi.dmm.js
index 8bbb9d75..874cdf1c 100644
--- a/src/js/entrypoints/pages/osapi.dmm.js
+++ b/src/js/entrypoints/pages/osapi.dmm.js
@@ -4,8 +4,6 @@ import DamageSnapshotDisplay from "../../Components/Routine/DamageSnapshot";
 import LaunchPositionRecorder from "../../Components/Routine/LaunchPositionRecorder";
 import InAppActionButtons from "../../Components/Routine/InAppActionButtons";
 
-chrome.runtime.connect();
-
 import {Client} from "chomex";
 const client = new Client(chrome.runtime);
 
@@ -28,7 +26,9 @@ client.message("/config/get", {key: "use-inapp-action-buttons"}).then(({data}) =
   window.onbeforeunload = () => onBeforeUnloadFuncs.map(f => f()).filter(r => !!r).length ? true : null;
 });
 
-(new LaunchPositionRecorder(client)).mainGameWindow(15 * 1000);
+(new LaunchPositionRecorder(client)).mainGameWindow(15 * 1000).catch(() => {
+  window.alert(LaunchPositionRecorder.disconnectedMessage);
+});
 
 let snapshot = new DamageSnapshotDisplay(client);
 let router = new Router();