Add a method to reset(null) the value of the selection column.

[bosskmk]

In the case of the selection column, values other than items are not changed.

Currently, you can change the value in the following way.

stateManager.currentCell.value = '';
stateManager.notifyListeners();

I will add a method to reset the value later.

And changing the value is as follows.

// For force, the default is false. 
// This is when the mode of the grid is select, 
// only the row can be selected and the value cannot be modified. 
// In this case, the value can be forcibly modified.
stateManager.changeCellValue(stateManager.currentCell.key, null, force: true);

Originally posted by @bosskmk in https://github.com/bosskmk/pluto_grid/discussions/129#discussioncomment-292111

[henry2man]

I've achieved something more user-friendly, allowing using a keyboard shortcut (supr) + adding an empty value (null) to my select items parameter:

// Add null to the list of valid items
var items = [null]..addAll(computedItems);

...

PlutoGrid(
 onLoaded: (PlutoGridOnLoadedEvent event) {
                            stateManager = event.stateManager;
                            removeKeyboardListener = stateManager!
                                .keyManager!.subject.stream
                                // Keyboard listener
                                .listen(handleKeyboard);
                            stateManager!
                                .setSelectingMode(PlutoGridSelectingMode.none);
                          },

...

 // Column definition
 PlutoColumn(
        title: 'Nullable column',
        field: 'columnId',
        type: PlutoColumnType.select(items)),

...

// Keyboard listener to delete values
void handleKeyboard(PlutoKeyManagerEvent event) {
    // Specify the desired shortcut key.
    var currentCell = stateManager?.currentCell;
    if (currentCell != null) {
      if (event.isKeyDownEvent) {
        // On SUPR
        if (event.event.logicalKey == LogicalKeyboardKey.delete) {
          var column = stateManager?.currentColumn?.field;
          if (column == 'columnId') {
            // Empty the cell
            currentCell.value = '';
            stateManager!.notifyListeners();
          } 
        }
      }
    }
  }

It could be great to have something like this when a default PlutoGrid is created (using, of course, the wanted new "reset(null)" method you said.

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