Meld allows users to compare two or three different folders for differences. But if a user wants to 'zoom in' and compare files contained in these folders, Meld gives you the ability to do so and launch file comparisons between files contained in different folders or in the same folder.
Not all contextual elements are exposed to the cli. Specifically the ability to follow our not follow symlinks, but also things like file system metadata parsing. These options and others can only be toggled via the gui's settings window.