TODO.txt

IMPROVEMENTS
============
[x] Refactor internal state (3).
[x] Ensure that UI updates correctly on state change (column, row, group) (3).
[x] Fix sorting (column and group) - sorting by columns seems to sort groups, and collapses groups (2)?
[x] Be able to specify which groups are initially expanded (by entire group) (2).
[x] Add filler column to the right.
[x] Look at moving sort details off the column and remove 'none (1).
[x] Sort appropriate groups if sorted by column.
[x] Fix keyboard navigation (4).
[x] Row hover/highlight colour change.
[x] Toggle column separators/lines (1).
TOTAL: 16/16

FEATURES
========
[x] Add drag & drop group bar (3).
[x] Add total/footer/summary row - should apply to each group as well (4).
[-] Add filter support (10).
[ ] Add paging support (7).
[x] Add fixed columns (3)
[x] Add date support and visualizer (1).
[x] Add array value support (and default visualizer) (2).
[x] Add formatter support to columns - simpler than visualizers (works with default and custom visualizers) (3).
[ ] Add max group count (1).
[x] Hidden columns (1).
[ ] Column Groups (multilevel columns)?
[x] Resizable columns (2).
[x] Reorder columns (1).
[ ] Row editing.
[ ] Ability to freeze a row at the top.
[ ] Virtualization
TOTAL: 20/38

FIXES
=====
[-] Clean up styling (use CSS custom variables, etc.) (2).


https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_refs_focus_management


Keyboard Navigation
===================
TAB  : Navigate between form elements.
            Checkboxes and actions on rows (space/enter invokes).
            Filter elements on filter row.
            Sort elements on header.
            Group elements on grouper.
ARROW: Up/Down navigates between rows (needs row highlight).

Editing
=======
Inline (on cell click or edit action).
Form (row transforms into an inline form row, like the details).
Popup (similar to the above, but a dialog).