expand plan for addressing to-do list in todo.md a bit

todo.md

@@ -1,6 +1,11 @@
 # To-do list
-- Add tests for indent, dedent and remove-line-break motions
 - Add normal-delete tests for each motion, checking that searchList is as expected
+  - Three cases for searchList:
+    1. Deletion causes two words to join to form a new match
+    2. Deletion causes an existing match to be extended
+    3. Deletion introduces no match
+- Add tests for indent, dedent and remove-line-break motions
+  - Add tests that searchList updates as expected too
 - Add tests for other yank motoins
   - Tests should be based on existing tests for delete-motions, and in the same order.
 - Bind gamepad functions from GLFW and/or RGFW