Add logging to spellcheck dictionaries loading

app/main.ts

@@ -797,7 +797,8 @@ async function createWindow() {
   setupSpellChecker(
     mainWindow,
     getPreferredSystemLocales(),
-    getResolvedMessagesLocale().i18n
+    getResolvedMessagesLocale().i18n,
+    getLogger()
   );
   if (!startInTray && windowConfig && windowConfig.maximized) {
     mainWindow.maximize();

app/spell_check.ts

@@ -11,6 +11,7 @@ import { maybeParseUrl } from '../ts/util/url';
 import type { MenuListType } from '../ts/types/menu';
 import type { LocalizerType } from '../ts/types/Util';
 import { strictAssert } from '../ts/util/assert';
+import type { LoggerType } from '../ts/types/Logging';
 
 export const FAKE_DEFAULT_LOCALE = 'en-x-ignore'; // -x- is an extension space for attaching other metadata to the locale
 
@@ -55,9 +56,24 @@ export function getLanguages(
 export const setup = (
   browserWindow: BrowserWindow,
   preferredSystemLocales: ReadonlyArray<string>,
-  i18n: LocalizerType
+  i18n: LocalizerType,
+  logger: LoggerType
 ): void => {
   const { session } = browserWindow.webContents;
+
+  session.on('spellcheck-dictionary-download-begin', (_event, lang) => {
+    logger.info('spellcheck: dictionary download begin:', lang);
+  });
+  session.on('spellcheck-dictionary-download-failure', (_event, lang) => {
+    logger.error('spellcheck: dictionary download failure:', lang);
+  });
+  session.on('spellcheck-dictionary-download-success', (_event, lang) => {
+    logger.info('spellcheck: dictionary download success:', lang);
+  });
+  session.on('spellcheck-dictionary-initialized', (_event, lang) => {
+    logger.info('spellcheck: dictionary initialized:', lang);
+  });
+
   const availableLocales = session.availableSpellCheckerLanguages;
   const languages = getLanguages(
     preferredSystemLocales,