Method insertCharacter

packages/pi-tui/src/components/input.ts:213–222

(char: string)

	}

	private insertCharacter(char: string): void {
		// Undo coalescing: consecutive word chars coalesce into one undo unit
		if (isWhitespaceChar(char) || this.lastAction !== "type-word") {
			this.pushUndo();
		}
		this.lastAction = "type-word";

		this.value = this.value.slice(0, this.cursor) + char + this.value.slice(this.cursor);
		this.cursor += char.length;
	}

	private handleBackspace(): void {
		this.lastAction = null;