fix 'MakeNormalDelete.deleteLineBack' test, which failed because we were using the wrong way to check if cursor is currently at the start of the line. We checked '(endOfLine = cursorIdx) which works in most cases to verify that the current position is a newline, but fails when the cursor is at the last non-newline character of the line. This is fixed by being more precise and calling 'Cursor.isCursorAtStartOfLine' to check directly if the cursor is currently at the end of the line.

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

@@ -547,8 +547,9 @@ struct
            * then we only want to delete 1 character at this line, 
            * which is the newline the cursor is at.
            * Otherwise, we want to delete 2 chars by default. *)
+          val buffer = LineGap.goToIdx (endOfLine, buffer)
           val endOfLine =
-            if endOfLine = cursorIdx then endOfLine + 1 else endOfLine + 2
+            if Cursor.isCursorAtStartOfLine (buffer, endOfLine) then endOfLine + 1 else endOfLine + 2
         in
           finishDeleteLineBack (app, buffer, 0, endOfLine, endOfLine, time)
         end
@@ -560,8 +561,9 @@ struct
            * then we don't want to delete the newline
            * as we are already deleting the newline 
            * at the start of this range *)
+          val buffer = LineGap.goToIdx (endOfLine, buffer)
           val endOfLine =
-            if endOfLine = cursorIdx then endOfLine else endOfLine + 1
+            if Cursor.isCursorAtStartOfLine (buffer, endOfLine) then endOfLine else endOfLine + 1
 
           val buffer = LineGap.goToLine (newCursorLineNumber, buffer)
 

temp.txt

@@ -1,5 +1,4 @@
 hello
 world
-
 trello
 brillo