Not sure if this is a bug or not but it looks like one:
Tabbing is supposta ignore 'odd' leading spaces and take you rightward
to the next multiple of whatever the tab size is, yes? Of course -- we
use tabs to cure raggedness. But I noticed something: if a line has
auto-wrapped, then that changes -- if within the top part of a line
(that hasn't wrapped) I hit tab, I get moved rightward (whatever tab
size is set to) characters and what was ragged before the tab is exactly
the same raggedness after the tab. IOW, to appearances, the tab simply
adds (tab size) spaces. If I then go to the end of the wrapped line and
start deleting characters until the line no longer wraps, the above
problem cures itself and every thing snaps back to normal tab behavior.
Is this a bug or a feature?