Method doClear

tools/xsbug/behaviors.js:76–81

(code)

		return this.historyIndex > 0;
	}
	doClear(code) {
		this.onChanging(code);
		code.insert()
		this.onChanged(code);
		this.onReveal(code);
	}
	doCopy(code) {
		system.setClipboardString(code.selectionString);
	}