iPad: "Choose image" popover moves around when rotating device

[rachelmcr]

When I add an image block, there's a "Choose Image" button. On Android and iPhone that brings up an action sheet, but on iPad it brings up an action popover. That popover moves around on the screen when I rotate my device between portrait and landscape.

Screencast: https://cloudup.com/cRavA8Zdr_N

@etoledom suggested that the popover should probably stay near the button, maybe with a little arrow. One example of that is the popover in WPiOS when you exit the editor after making changes:

[SergioEstevao]

At the moment we are just centering the alert on the middle of the screen. When the device is rotated we don't update the position to the center of the new layout.

To implement the arrow, like in the image above, we will need to have a way to detect what is the current view that is selected in the JS/RN side and keep a track of that.