Add support for disabling spell check (#22220)

Co-authored-by: Michael Telatynski <[email protected]>

src/vector/platform/ElectronPlatform.tsx

@@ -175,9 +175,7 @@ export default class ElectronPlatform extends VectorBasePlatform {
      * Return true if platform supports multi-language
      * spell-checking, otherwise false.
      */
-    public supportsMultiLanguageSpellCheck(): boolean {
-        // Electron uses OS spell checking on macOS, so no need for in-app options
-        if (isMac) return false;
+    public supportsSpellCheckSettings(): boolean {
         return true;
     }
 
@@ -305,7 +303,18 @@ export default class ElectronPlatform extends VectorBasePlatform {
         return this.ipc.call('setLanguage', preferredLangs);
     }
 
-    public setSpellCheckLanguages(preferredLangs: string[]) {
+    public setSpellCheckEnabled(enabled: boolean): void {
+        this.ipc.call('setSpellCheckEnabled', enabled).catch(error => {
+            logger.log("Failed to send setSpellCheckEnabled IPC to Electron");
+            logger.error(error);
+        });
+    }
+
+    public async getSpellCheckEnabled(): Promise<boolean> {
+        return this.ipc.call('getSpellCheckEnabled');
+    }
+
+    public setSpellCheckLanguages(preferredLangs: string[]): void {
         this.ipc.call('setSpellCheckLanguages', preferredLangs).catch(error => {
             logger.log("Failed to send setSpellCheckLanguages IPC to Electron");
             logger.error(error);