Ensure that inline display without color has newlines

This was broken in 3147eb8e6a when
newline splitting was made consistent, and
2071517621 only fixed the inline case
when color was enabled.

Fixed #383

CHANGELOG.md

@@ -12,6 +12,9 @@ errors.
 Line numbers styling has been tweaked to make it more visually
 distinct from file content.
 
+Fixed an issue with inline display discarding newlines when color is
+disabled, leading to broken display.
+
 ## 0.37 (released 14th October 2022)
 
 ### Manual

src/display/inline.rs

@@ -45,11 +45,11 @@ pub fn print(
         (
             split_on_newlines(lhs_src)
                 .iter()
-                .map(|s| (*s).to_owned())
+                .map(|s| format!("{}\n", s))
                 .collect(),
             split_on_newlines(rhs_src)
                 .iter()
-                .map(|s| (*s).to_owned())
+                .map(|s| format!("{}\n", s))
                 .collect(),
         )
     };