fix: Always style primary_title

src/renderer/mod.rs

@@ -219,10 +219,10 @@ impl Renderer {
                 let mut message_iter = group.elements.iter().enumerate().peekable();
                 if let Some(title) = &group.title {
                     let peek = message_iter.peek().map(|(_, s)| s).copied();
-                    let title_style = if g == 0 {
-                        TitleStyle::MainHeader
-                    } else {
+                    let title_style = if title.allows_styling {
                         TitleStyle::Header
+                    } else {
+                        TitleStyle::MainHeader
                     };
                     let buffer_msg_line_offset = buffer.num_lines();
                     self.render_title(

tests/color/main.rs

@@ -12,6 +12,7 @@ mod fold_trailing;
 mod issue_9;
 mod multiline_removal_suggestion;
 mod multiple_annotations;
+mod primary_title_second_group;
 mod simple;
 mod strip_line;
 mod strip_line_char;

tests/color/primary_title_second_group.rs

@@ -0,0 +1,25 @@
+use annotate_snippets::{AnnotationKind, Group, Level, Renderer, Snippet};
+
+use snapbox::{assert_data_eq, file};
+
+#[test]
+fn case() {
+    let report =
+        &[
+            Group::with_title(Level::ERROR.primary_title("mismatched types").id("E0308")).element(
+                Snippet::source("        slices: vec![\"A\",")
+                    .line_start(13)
+                    .path("src/multislice.rs")
+                    .annotation(AnnotationKind::Primary.span(21..24).label(
+                        "expected struct `annotate_snippets::snippet::Slice`, found reference",
+                    )),
+            ),
+            Group::with_title(Level::NOTE.primary_title(
+                "expected type: `snippet::Annotation`\n   found type: `__&__snippet::Annotation`",
+            )),
+        ];
+
+    let expected = file!["primary_title_second_group.term.svg"];
+    let renderer = Renderer::styled();
+    assert_data_eq!(renderer.render(report), expected);
+}