How do I use custom row actions with editingMode='row'?

[githorse]

The custom row actions example in the docs shows an example of an edit button that triggers the modal editor. This works because the modal editor itself knows how to save the data.

But I want to use custom row actions to trigger an inline row edit. To do that, I need to:

1. Inside renderRowActions, detect whether the row is currently being edited or not, so I can flip the edit button to a save button; and
2. In the save button, call some method to trigger the save (like the modal editor does).

Basically, I need two methods along the lines of row.isEditing() and table.saveRow(row), I think:

renderRowActions=(({row, table}) => (
  row.isEditing() ? (
    <SaveButton onClick={() => table.saveRow(row)}
  ) : (
    <EditButton onClick={() => table.setEditingRow(row)}
  )
)}

(Maybe methods like these are available -- I looked but may have missed them.)

So how do I (1) detect that a row is in editing mode, and (2) trigger a save on that row? More generally, how do I use a custom edit button in inline editing mode?

[githorse]

Here is my latest attempt at this:

renderRowActions: ({row, table}) => {
  const originalRecord = row.original
  const editedRecord   = {...originalRecord, ...table.getState().editingRow?._valuesCache as Thingy}
  const startEditing   = () => table.setEditingRow(row)
  const stopEditing    = () => table.setEditingRow(null)
  const hasChanges     = !isEqual(originalRecord, editedRecord)
  const isEditing      = table.getState().editingRow?.id === row.id
  const index          = row.index
  return (
    isEditing ? (
      <Stack>
        <SaveButton onClick={() => saveThingy(editedRecord)} disabled={!hasChanges} />
        <CancelButton onClick={stopEditing} />
      </Stack>
    ) : (
      <Stack>
        <EditButton onClick={startEditing} />
        <DeleteButton onClick={() => deleteThingy(index)} />
      </Stack>
    )
  )
}

Obviously, this is pretty convoluted; perhaps future MRT versions might export higher level abstractions than row and table (like all my consts) to make this easier. However, this doesn't quite work yet. It works with built-in editors, but not when I use a custom editing widget, in which case it gets glitchy and fails to save correctly. Still trying to figure out why, but feel free to weigh in. I'll edit this if I figure it out.