Document how to Press and hold

[codingedgar]

You can also click near the first item, press and hold the trackpad or mouse button, then drag over all of the items. This method’s especially useful in the Icon view in the Finder.

[codingedgar]

This can be expressed with:

• Detect drag-to-select
• Deselect all
• Select adjacent (mouse over item)

but i guess it still will be nice to have it documented