Issue #329: Add button scroll up/scroll down in dialog detail (dismine/valentina)

New issue 329: Add button scroll up/scroll down in dialog detail https://bitbucket.org/valentinateam/valentina/issue/329/add-button-scroll-up-scroll-down-in-dialog

Roman Telezhinskyi:

Allow user scroll list of objects in the dialog detail. This will help select correct place for “open” seam allowence.