fix failing test for 'd$' motion, which means completing tests for 'd$' motion too

fcore/normal-mode/make-normal-delete.sml

@@ -445,6 +445,10 @@ struct
            * after having performed the deletion. *)
           val buffer = LineGap.goToIdx (lineStart, buffer)
           val cursorIdx = Cursor.viDlr (buffer, lineStart, 1)
+          val buffer = LineGap.goToIdx (cursorIdx, buffer)
+          val cursorIdx =
+            if Cursor.isOnNewlineAfterChr (buffer, cursorIdx) then cursorIdx - 1
+            else cursorIdx
         in
           finishAfterDeletingBuffer (app, cursorIdx, buffer, time, initialMsg)
         end

shell/shell.sml

@@ -84,7 +84,6 @@ struct
       (* load file intol gap buffer and create initial app *)
       val io = TextIO.openIn "temp.txt"
       val lineGap = ioToLineGap (io, LineGap.empty)
-      val lineGap = LineGap.fromString "hello\nworld"
       val _ = TextIO.closeIn io
       val app = AppType.init (lineGap, 1920, 1080, Time.now ())
 

todo.md

@@ -1,7 +1,6 @@
 # To-do list
 
 - Add tests for:
-  - `d$`
   - `d^`
   - `dd`
   - `dn`