Thanks @dcalhoun for figuring this out, in David's words:
Atom has now deprecated the resize-panes package. This means the package will not be returned when searching. Atom also blocks the package from activating even if you already have resize-panes installed.
The reason Atom did this is because the abilities of this package have been folded into core. One ability still missing is the keybindings for resizing panes, but there is a open PR to add this.
Grows the active pane gradually shrinking other panes proportionally.
Shrinks the active pane gradually growing other panes proportionally.
| Command name | Default key binding |
|---|---|
resize-panes:enlarge-active-pane |
cmd-alt-= |
resize-panes:shrink-active-pane |
cmd-alt-- |