[grid] Automatic Tooltip on overflow

[knoobie]

Describe your motivation

Automatically show a tooltip for columns that have text that overflows.

Describe the solution you'd like

grid.addColumn(Object::getValue).setTooltipOnOverflow(true);

Describe alternatives you've considered

No response

Additional context

No response

[rolfsmeds]

The challenge with this is overflow detection on cells, as the Grid currently has no idea if a cell's contents overflow. Running that check on every cell might aversely affect the Grid's performance.

A more lightweight approach might be to run the check on mouseover (with a small delay/debounce to prevent it getting triggered a lot if the user moves the pointer around over the Grid, which is quite common), have a single Tooltip instance already instantiated (like with tooltipGenerator), and if overflow is detected, set its text to that of the cell, and open it.

The delay could probably be acceptable since tooltips generally open with a delay anyway.