Currently delegates do not get deleted when removed from models. Due to
the complexity of drag state and other objects, we can't simply delete
the delegate when removed from the model because they might still be
involved in animations or other state at the time of removal. Use smart
pointers to have the delegate objects deleted instead.
QML unfortunately doesn't support QSharedPointer, so we need to expose raw pointers to it.
This fixes an issue where if the device is rotated in a folder, the page would not snap immediately back to the right position, but would instead animate icon position changes.
To achieve this, the following changes were made.
- changes were made to how the folder gird size is calculated to prevent an issue with the grid size changing for a brief period of time during screen rotation, causing problems with snapping to the correct page.
- icons position animations are now done by a animated index value to prevent it from animating when the device rotates
- when the device screen size changes (ex: device rotation), it now snaps to the current folder page, as before it would just stay in between the two pages.
This fixes an issue where if the device is rotated on the 2nd or further page, the page would not snap immediately back to the right position, but would instead animate.
