Support 2D Mode #804
Description
react-split-grid, discussed here with a useful generator, is good at handling splits with multiple rows and multiple columns.
It would be great UX-wise for both sliders to be snapped with a single click, similar to how a 2d color picker works like react-colorful. Clicking anywhere on the 2D area makes the slider x and y value snaps to the mouse pointer, and both x and y slider values are edited with callback passing the 2d value.