reindent when modifying an atom at head position
treee3acdc9cfca1a2842127f3271e142b6b3e1d9c5e
-rw-r--r-- 1112 HACKING
-rw-r--r-- 19664 edit.lua
-rw-r--r-- 173 init.lua
-rw-r--r-- 4936 input.lua
drwxr-xr-x - parser
drwxr-xr-x - vis
-rw-r--r-- 9660 walker.lua