Must undo twice to undo paredit delete-empty-list if reformat-as-you-type altered the document

[pbwolf]

If reformat-as-you-type is engaged, and you use paredit backspace or deleteForward to remove an empty list (which triggers reformat-as-you-type, if it's engaged), and the reformatter changes the document text (which it doesn't always), then you need to use Undo twice to get the empty list back.

For example, start with a flush-left outer form that contains an overly-indented line with an empty list; cursor positioned inside the empty list:

(do
    42 (|))

Backspace; now you have

(do
  42 |)

Undo once:

(do
    42 )

Undo again:

(do
    42 (|))

On the other hand, if reformat-as-you-type only moves the cursor, without changing the document text, then one Undo is enough: start with

(do
  42 (|),,,)

Backspace

(do
  42 ,,,|)

Undo just once, and it restores the empty list.

[pbwolf]

This might be a conflict between the resolution of #2611 and Calva's format-as-you-type. The same problem can be induced for another paredit command (slurp forward) by removing the undoStopAfter:false override from DocumentModel.edit. Backspace and deleteForward, which as of #2611 are registered with registerTextEditorCommand, do not control the undoStop settings of the TextEditorEdit that they receive from VS Code.