It used to return the path unchanged when the path didn't end in oldExtension,
so a caller that guessed wrong silently went on using the original file - and
"the screenshot next to this savestate" quietly becomes "this savestate".
Every caller had to know to check the extension first, and most didn't.
Now it's [[nodiscard]] bool with an out-param, in the style of ComputePathTo
next door, so the mismatch has to be handled. Changing the signature rather
than the behaviour means no call site can keep the old assumption by accident.
All four callers wanted "skip it" or "fall back", which they now say out loud.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Due to how we mount stuff, we need to be able to navigate one step up
from the executable, and then re-attach the executable filename. To
allow this, in content URIs, treat ':' as a directory separator for
navigation purposes.
End result, you can now download cube.elf from the website and run it directly
from Downloads without using a file manager to move it.
