Flipbook functionality break

[itr-tayyababbas]

@ts1 @MaikoTan @siderisng @vivekKodira
flipbook.page becomes greater than flipbook.numPages because when we do flip through dragging the page it changes the current page number even flipbook.canFlipRight or flipbook.canFlipLeft are false. It should also not allow the user to drag the flipbook when it's loading otherwise these slot variables remain false and the current page number will be increased from its total number of pages.
Let me know if you guys need any help in it so I will contribute.
Regard: Tayyab