This problem happens when the modal is larger than the screen canvas.
Compared to original bootstrap modal, I found that the bootstrap add class 'modal-open' to the body tag when the modal is open, this seems to fix the scrolling bars of the model.
But when using ember-idx-modal, this class is not added to body, thus the scroll breaks (not actually break, but the scrolls bar work for the background body, not the modal)
This problem happens when the modal is larger than the screen canvas.
Compared to original bootstrap modal, I found that the bootstrap add class 'modal-open' to the body tag when the modal is open, this seems to fix the scrolling bars of the model.
But when using ember-idx-modal, this class is not added to body, thus the scroll breaks (not actually break, but the scrolls bar work for the background body, not the modal)