Attach handlePointerUp to ownerDocument body #475
Merged
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This PR changes which element the handlePointerUp event handler is added to, it now adds the event handler to the body element of each owner docment where a panelResizeHandle is rendered. This accounts for use cases where the panelResizeHandle is rendered in a document that is in a child window.
This PR also adds a test for checking which document body the event handler is added to, which demonstrates a usecase where PanelResizeHandles are rendered to a separate document.
addresses #468