Migrate to touchimageview from photoview, and adjust the touch logic to correctly handle single finger drag, two finger pinch/stretch, flings, taps, and swipes.
As before, the features are:
- Single tap, show/hide controls and media description
- Double tap, zoom in/out
- Single finger drag up/down, scale/translate image, dismiss if scrolled too far
- Single finger drag left/right
- When not zoomed, swipe to next image if multiple images present
- When zoomed, scroll to edge of image, then to next image if multiple images present
- Two finger pinch/zoom, zoom in/out on the image
Behaviour differences to previous code
1. Bug fix: The image can't get "stuck" when zoomed, and impossible to scroll
2. Bug fix: Pinching is not mis-interpreted as a fling, closing the image
3. Bug fix: The zoom state of images is not lost or misinterpreted when the user swipes through multiple images
4. Bug fix: Double-tap zooms all the way, instead of stopping
5. Tapping outside the image does not dismiss it, controls and description show/hide
Fixes https://github.com/tuskyapp/Tusky/issues/3562, https://github.com/tuskyapp/Tusky/issues/2297
79ee2dc32c