Fix removal highlighting for multiple indented lines

src/renderer/source_map.rs

@@ -556,10 +556,8 @@ impl<'a> SourceMap<'a> {
                 }
             }
         }
-        // remove trailing newlines
-        while buf.ends_with('\n') {
-            buf.pop();
-        }
+        // remove trailing whitespace
+        buf.truncate(buf.trim_end().len());
         if highlights.iter().all(|parts| parts.is_empty()) {
             None
         } else {

tests/color/main.rs

@@ -16,6 +16,7 @@ mod highlight_source;
 mod highlight_source_multi_width_chars;
 mod highlight_source_zero_width_chars;
 mod issue_9;
+mod multiline_removal_indent;
 mod multiline_removal_last_line_tabs;
 mod multiline_removal_suggestion;
 mod multiple_annotations;

tests/color/multiline_removal_indent.rs

@@ -0,0 +1,19 @@
+use annotate_snippets::{Group, Level, Patch, Renderer, Snippet, renderer::DecorStyle};
+
+use snapbox::{assert_data_eq, file};
+
+#[test]
+fn test() {
+    let report = &[Group::with_level(Level::ERROR).element(
+        Snippet::source("do\n  local function f()\n    print()\n  end\nend\n")
+            .patch(Patch::new(5..41, "")),
+    )];
+
+    let expected_ascii = file!["multiline_removal_indent.ascii.term.svg": TermSvg];
+    let renderer = Renderer::styled();
+    assert_data_eq!(renderer.render(report), expected_ascii);
+
+    let expected_unicode = file!["multiline_removal_indent.unicode.term.svg": TermSvg];
+    let renderer = renderer.decor_style(DecorStyle::Unicode);
+    assert_data_eq!(renderer.render(report), expected_unicode);
+}