fix: commenting full lines

helix-core/src/comment.rs

@@ -137,10 +137,10 @@ pub fn toggle_line_comments(doc: &Rope, range: &Range, token: Option<&str>) -> V
     let comment = Tendril::from(format!("{} ", token));
 
     let start = text.char_to_line(range.from());
-    let end = text.char_to_line(range.to());
+    let end = text.char_to_line(range.to().saturating_sub(1));
-
+    let line_count = text.len_lines();
-    let start = start.clamp(0, text.len_lines());
+    let start = start.clamp(0, line_count);
-    let end = (end + 1).min(text.len_lines());
+    let end = (end + 1).min(line_count);
 
     let mut lines = vec![];
     lines.extend(start..end);

helix-term/tests/test/comments.rs

@@ -179,6 +179,64 @@ async fn test_injected_comment_tokens_multiple_selections() -> anyhow::Result<()
     ))
     .await?;
 
+    // Full-line selection commenting
+    test((
+        indoc! {r#"\
+            <p>Comment toggle on this line should use the HTML comment token(s).</p>
+            <script type="text/javascript">
+              // Comment toggle on this line should use the javascript comment token(s).
+            #[  foo();
+              css`
+            |]#    html {
+                  background-color: red;
+                }
+              `;
+            </script>
+        "#},
+        ":lang html<ret> c",
+        indoc! {r#"\
+            <p>Comment toggle on this line should use the HTML comment token(s).</p>
+            <script type="text/javascript">
+              // Comment toggle on this line should use the javascript comment token(s).
+            #[  // foo();
+              // css`
+            |]#    html {
+                  background-color: red;
+                }
+              `;
+            </script>
+        "#},
+    ))
+    .await?;
+    test((
+        indoc! {r#"\
+            <p>Comment toggle on this line should use the HTML comment token(s).</p>
+            <script type="text/javascript">
+              // Comment toggle on this line should use the javascript comment token(s).
+            #[  // foo();
+              // css`
+            |]#    html {
+                  background-color: red;
+                }
+              `;
+            </script>
+        "#},
+        ":lang html<ret> c",
+        indoc! {r#"\
+            <p>Comment toggle on this line should use the HTML comment token(s).</p>
+            <script type="text/javascript">
+              // Comment toggle on this line should use the javascript comment token(s).
+            #[  foo();
+              css`
+            |]#    html {
+                  background-color: red;
+                }
+              `;
+            </script>
+        "#},
+    ))
+    .await?;
+
     // Works with block comment toggle across different layers
     test((
         indoc! {r#"\