Pinch to zoom: see if we can align to top/center for taller than 9:16 devices (currently it aligns to top/left)

[mzorz]

With devices taller than 9:16 and images with a width equal or greater than the device's screen width, we're causing the pivot point in PhotoView library introduced in #651 to be anchored at the top-left of the screen (by using FIT_START).

IMG_1187.MOV

This behavior comes from this part of code:

                    if (isScreenTallerThan916(screenWidth, screenHeight) &&
                            (drawable.intrinsicHeight > drawable.intrinsicWidth)
                    ) {
                        val transformToUse = if (drawable.intrinsicWidth >= screenWidth) {
                            // this aligns to top so there's no top black bar
                            photoEditorView.source.scaleType = FIT_START
                            null
                    } [...]

The thing is on Android we can’t really anchor the image to top|center but only to either top|left or top|right as per the predefined ScaleType (see FIT_START, FIT_END). We could probably override this but it’d involve programming the scaling behavior ourselves to anchor to the center.

[mzorz]

As an alternative, I thought of disabling pinch to “zoom out” when the condition to use FIT_START is met (this is only for screens taller than 9:16 using an image whose width is equal or larger than the device’s screen width - that image is 1080x1920 and the Pixel 5 is 1080x2340, hence it falls into this case where we'd want to be “aligning to top” but we’re using FIT_START for that as we can’t “center to top” as explained).

I tried enabling / disabling zoom attaching the call to a ScaleChangedListener but the thing is it internally resets the matrix each time, so decided to file the issue here for later.