feat: swap cursor start/end if needed when sending

src/cursor/controller.rs

@@ -50,7 +50,11 @@ impl Controller<CursorEvent> for CursorController {
 	type Input = CursorPosition;
 
 	/// enqueue a cursor event to be broadcast to current workspace
-	fn send(&self, cursor: CursorPosition) -> Result<(), Error> {
+	/// will automatically invert cursor start/end if they are inverted
+	fn send(&self, mut cursor: CursorPosition) -> Result<(), Error> {
+		if cursor.start() < cursor.end() {
+			std::mem::swap(&mut cursor.start, &mut cursor.end);
+		}
 		Ok(self.op.send(CursorEvent {
 			user: self.uid.clone(),
 			position: Some(cursor),

src/cursor/mod.rs

@@ -37,3 +37,13 @@ impl CursorPosition {
 		self.end.clone().unwrap_or((0, 0).into())
 	}
 }
+
+impl PartialOrd for RowCol {
+	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+		match self.row.partial_cmp(&other.row) {
+			Some(core::cmp::Ordering::Equal) => {}
+			ord => return ord,
+		}
+		self.col.partial_cmp(&other.col)
+	}
+}