Show linkages between widget controls and widgets in preview #5
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When beginning to edit a widget or when hitting Update, the preview window should scroll the widget into view, or make sure it is in view. Likewise, when hovering over a widget control, the widget in the preview window should highlight with a red outline, and likewise when clicking on a widget in the preview, the corresponding widget control should expand in the customizer panel.
This issue resolves a major usability problem illustrated by the user test video via @shaunandrews. Clicking a widget in the preview will now will open up the widget form control in the customizer panel.