Check if the contents of Object Browser changed
Save the entire contents of the Object Browser in a buffer and compare
it with a backup buffer. Only send a message to Neovim telling it to
update the Object Browser if there is any difference between the two
buffers. This makes the option vimcom.alwaysls unnecessary. Previously,
there were two options: always update the object browser or update only
when the total number of objects has changed. The new method may be
slower, but is more precise.