fix: don't setIsDragging unless the element is draggable

[pulsedemon]

Fixes an issue I've been having with not being able to click in shadow dom inputs.

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[adambarito]

This would close #288, which has been a pain point for me with drag-and-drop usage inside the drawer.

[artemis-prime]

Make sure you add proper support for the new "only drag handle" feature!