additional keys for history mode

ambient.d.ts

@@ -349,7 +349,7 @@ interface Utils {
 	complete_do_target(actions: {self: unknown, others: unknown}): Set<string>
 	complete_do(this: Optional<ICommand, 'Tag'>): undefined
 	replace_me(_match: string, _offset: number, whole: string): string
-	//pad_chat(chat: HTMLDivElement): undefined
+	scroll(): true
 }
 
 interface Complete {
@@ -445,15 +445,25 @@ interface InputHistory {
 	 */
 	ids: Set<number> | undefined
 
+	/**
+	 * Specific key handlers.
+	 */
+	key: Record<string, (textarea: HTMLTextAreaElement) => true>
+
+	/**
+	 * Set or unset the readonly mode on the input.
+	 */
+	icro(textarea: HTMLTextAreaElement, readonly: boolean): true
+
 	/**
 	 * Enter the history mode.
 	 */
 	enter(textarea: HTMLTextAreaElement, input: string, bottom: boolean, ids: Set<number>): true
 
 	/**
-	 * Exit the history mode and optionally restore original input.
+	 * Exit the history mode and proc the key event.
 	 */
-	exit(textarea: HTMLTextAreaElement, restore_input: boolean): true
+	exit(textarea: HTMLTextAreaElement, key: KeyboardEvent['key']): true
 }
 
 // FIXME spread around readonly where appropriate