Avoid deprecated ipcRenderer.sendTo.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

app/main/index.ts

@@ -1,7 +1,14 @@
 import type {Event} from "electron/common";
 import {clipboard} from "electron/common";
 import type {IpcMainEvent, WebContents} from "electron/main";
-import {BrowserWindow, app, dialog, powerMonitor, session} from "electron/main";
+import {
+  BrowserWindow,
+  app,
+  dialog,
+  powerMonitor,
+  session,
+  webContents,
+} from "electron/main";
 import {Buffer} from "node:buffer";
 import crypto from "node:crypto";
 import path from "node:path";
@@ -389,6 +396,21 @@ ${error}`,
     },
   );
 
+  ipcMain.on(
+    "forward-to",
+    <Channel extends keyof RendererMessage>(
+      _event: IpcMainEvent,
+      webContentsId: number,
+      listener: Channel,
+      ...parameters: Parameters<RendererMessage[Channel]>
+    ) => {
+      const contents = webContents.fromId(webContentsId);
+      if (contents !== undefined) {
+        send(contents, listener, ...parameters);
+      }
+    },
+  );
+
   ipcMain.on("update-menu", (_event, props: MenuProps) => {
     AppMenu.setMenu(props);
     if (props.activeTabIndex !== undefined) {

app/main/typed-ipc-main.ts

@@ -33,6 +33,15 @@ export const ipcMain: {
       ...args: Parameters<RendererMessage[Channel]>
     ) => void,
   ): void;
+  on(
+    channel: "forward-to",
+    listener: <Channel extends keyof RendererMessage>(
+      event: IpcMainEvent,
+      webContentsId: number,
+      channel: Channel,
+      ...args: Parameters<RendererMessage[Channel]>
+    ) => void,
+  ): void;
   on<Channel extends keyof MainMessage>(
     channel: Channel,
     listener: MainListener<Channel>,

app/renderer/js/components/webview.ts

@@ -226,7 +226,7 @@ export default class WebView {
     channel: Channel,
     ...args: Parameters<RendererMessage[Channel]>
   ): void {
-    ipcRenderer.sendTo(this.webContentsId, channel, ...args);
+    ipcRenderer.send("forward-to", this.webContentsId, channel, ...args);
   }
 
   private registerListeners(): void {

app/renderer/js/pages/preference/general-section.ts

@@ -356,7 +356,8 @@ export function initGeneralSection({$root}: GeneralSectionProps): void {
         const newValue = !ConfigUtil.getConfigItem("silent", true);
         ConfigUtil.setConfigItem("silent", newValue);
         updateSilentOption();
-        ipcRenderer.sendTo(
+        ipcRenderer.send(
+          "forward-to",
           currentBrowserWindow.webContents.id,
           "toggle-silent",
           newValue,

app/renderer/js/tray.ts

@@ -138,7 +138,7 @@ function sendAction<Channel extends keyof RendererMessage>(
     win.restore();
   }
 
-  ipcRenderer.sendTo(win.webContents.id, channel, ...args);
+  ipcRenderer.send("forward-to", win.webContents.id, channel, ...args);
 }
 
 const createTray = function (): void {

app/renderer/js/typed-ipc-renderer.ts

@@ -37,6 +37,12 @@ export const ipcRenderer: {
     rendererChannel: Channel,
     ...args: Parameters<RendererMessage[Channel]>
   ): void;
+  send<Channel extends keyof RendererMessage>(
+    channel: "forward-to",
+    webContentsId: number,
+    rendererChannel: Channel,
+    ...args: Parameters<RendererMessage[Channel]>
+  ): void;
   send<Channel extends keyof MainMessage>(
     channel: Channel,
     ...args: Parameters<MainMessage[Channel]>
@@ -56,11 +62,6 @@ export const ipcRenderer: {
       : never,
     transfer?: MessagePort[],
   ): void;
-  sendTo<Channel extends keyof RendererMessage>(
-    webContentsId: number,
-    channel: Channel,
-    ...args: Parameters<RendererMessage[Channel]>
-  ): void;
   sendToHost<Channel extends keyof RendererMessage>(
     channel: Channel,
     ...args: Parameters<RendererMessage[Channel]>