New dashboard allows to include widgets such as graphs. If you zoom-in on a graph, you can't zoom-out anymore, not even reloading the page.

Steps to reproduce:

1. Install Zabbix 3.4.3
2. Navigate to Dashboard
3. Add a new graph element
4. Click-and-drag to zoom-in on the graph
5. Try to zoom-out

Result:
You cannot zoom-out from the graph, as clicking on the graph will try to keep zoom-in

Expected:
An alternative to zoom-out from the graph (like right-clicking, a reset button, something like that).