I think we want forceContentCheck to be true here.  This is primarily used only by IndexDiff.  IndexDiff is used only by tools that are trying to create a commit for the user.

If the user modifies a file, and then reverts its content back to what was already committed (or staged) but doesn't revert the last modified time of the file, we shouldn't show the file as modified in IndexDiff just because the timestamp is wrong.  So we should force a content check to ensure this isn't the case.