Do not include whitespace at the end of value.

org_mode_samples/object/macro/whitespace_in_args.org

@@ -0,0 +1,4 @@
+{{{foo(bar  baz)}}}
+
+{{{foo(bar
+baz)}}}

src/compare/diff.rs

@@ -3082,7 +3082,7 @@ fn compare_org_macro<'b, 's>(
         ),
         (
             EmacsField::Required(":value"),
-            |r| Some(r.source),
+            |r| Some(r.macro_value),
             compare_property_quoted_string
         ),
         (

src/parser/org_macro.rs

@@ -26,6 +26,7 @@ pub(crate) fn org_macro<'b, 'g, 'r, 's>(
     let (remaining, macro_name) = org_macro_name(context, remaining)?;
     let (remaining, macro_args) = opt(parser_with_context!(org_macro_args)(context))(remaining)?;
     let (remaining, _) = tag("}}}")(remaining)?;
+    let macro_value = get_consumed(input, remaining);
     let (remaining, _trailing_whitespace) =
         maybe_consume_object_trailing_whitespace_if_not_exiting(context, remaining)?;
 
@@ -40,6 +41,7 @@ pub(crate) fn org_macro<'b, 'g, 'r, 's>(
                 .into_iter()
                 .map(|arg| arg.into())
                 .collect(),
+            macro_value: Into::<&str>::into(macro_value),
         },
     ))
 }

src/types/object.rs

@@ -150,6 +150,7 @@ pub struct OrgMacro<'s> {
     pub source: &'s str,
     pub macro_name: &'s str,
     pub macro_args: Vec<&'s str>,
+    pub macro_value: &'s str,
 }
 
 #[derive(Debug, PartialEq)]