When using "Sort Tabs by Filename", some tabs become light grey (typically the N last ones, where N is sometimes a different amount).
For clarity: This is about the tabs that have filename in them. The actual tabs themselves, whether tab placement is at top, right, left or bottom, get the same lightgrey colors as the active (currently open) tab gets, except they're not open.
Is this a feature, if so what does it mean? Or is it a bug?