Keep scroll position of form editor and preview view in sync

[christian-konrad]

Is your feature request related to a problem? Please describe.

When working on larger forms, keeping the editor and preview in sync becomes frustrating since you have to scroll both views manually, and the items in the editor and preview are likely to be of different heights, which increases the difficulty.

Describe the solution you'd like

Keep scroll position of form editor and preview view in sync. There are multiple ways to do so:

• if I have element A in the center of my viewport in the editor, it should also be in the center of my viewport in the preview
• or the same but referring to the top/bottom of the viewport
• scroll to the element in the preview only when I focus (click) an element in the editor

Priority

The priority of this issue is based on how complex forms become that are built with our tools—we recommend keeping forms short and precise, so probably we can ignore this.

[pinussilvestrus]

Related to bpmn-io/form-js#324