Fix MultiProgress println when having no bars

Fixes #447

src/draw_target.rs

@@ -549,7 +549,15 @@ impl DrawState {
             if idx != 0 {
                 term.write_line("")?;
             }
-            term.write_str(line)?;
+
+            if idx + 1 != len || self.lines.len() == self.orphan_lines_count {
+                term.write_line(line)?;
+            } else {
+                // Don't append a '\n' if this is the last line and we're not
+                // just going to orphan all the lines
+                term.write_str(line)?;
+            }
+
             if idx + 1 == len {
                 // Keep the cursor on the right terminal side
                 // So that next user writes/prints will happen on the next line
@@ -736,4 +744,22 @@ mod tests {
             assert_eq!(result, case.expectation.into(), "case: {:?}", case);
         }
     }
+
+    #[cfg(feature = "in_memory")]
+    #[test]
+    fn multi_progress_println_newline() {
+        let in_mem = crate::InMemoryTerm::new(10, 10);
+        let mp = MultiProgress::with_draw_target(ProgressDrawTarget::term_like(Box::new(
+            in_mem.clone(),
+        )));
+
+        mp.println("This line is tooooooo long for the terminal\r\n")
+            .unwrap();
+        mp.println("but it should wrap correctly\r\n").unwrap();
+
+        assert_eq!(
+            in_mem.contents(),
+            "This line\nis toooooo\no long for\n the termi\nnal\nbut it sho\nuld wrap c\norrectly"
+        );
+    }
 }