Mid-frame video capture DMA behavior is incorrect #2017
Description
In mGBA 0.8.4, video capture DMA transfers data on the remaining visible scanlines when enabled mid-frame. This is not the case on hardware, which seems to transfer data in the next frame (always starting on scanline 2) when enabled on scanlines 0-161, and in the frame after the next frame when enabled on scanlines >= 162. The following test ROM transfers a bitmap using video capture DMA enabled on scanline 96.
