strip images down to only the image data
fdroidclient only uses the image data in icons, graphics, etc. but images can contain all sorts of metadata. For example, there was a vulnerability caused by bugs in EXIF handling in JPEGs, that also affected many other platforms. Given that the fix looks like [they copied code from one place into another]https://android.googlesource.com/platform/frameworks/base/+/e739d9ca5469ed30129d0fa228e3d0f2878671ac), it is likely we will see more bugs like this.
fdroidclient should therefore strip out all unused data from images before caching or displaying them.