Add search result count to SearchAddon

addons/xterm-addon-search/src/SearchAddon.ts

@@ -106,6 +106,14 @@ export class SearchAddon implements ITerminalAddon {
     this._resultDecorations.clear();
   }
 
+  /**
+   * @returns the last search result count or 0
+   * if there are no results or decorations aren't enabled
+   */
+  public getSearchResultCount(): number {
+    return this._searchResults?.size || 0;
+  }
+
   /**
    * Find the next instance of the term, then scroll to and select it. If it
    * doesn't exist, do nothing.