From 76fc9c955e773bd28acfbc780937b77d9843c07b Mon Sep 17 00:00:00 2001
From: Max Brunsfeld <maxbrunsfeld@gmail.com>
Date: Tue, 15 Mar 2022 13:13:33 -0700
Subject: [PATCH] Restore underline for warnings about unused code

---
 crates/editor/src/editor.rs  |  2 +-
 crates/editor/src/element.rs | 25 ++++++++++++++-----------
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/crates/editor/src/editor.rs b/crates/editor/src/editor.rs
index a80af9ea5f..8c6904d136 100644
--- a/crates/editor/src/editor.rs
+++ b/crates/editor/src/editor.rs
@@ -4211,7 +4211,7 @@ impl Editor {
             };
             let group = diagnostics.find_map(|entry| {
                 if entry.diagnostic.is_primary
-                    && !entry.diagnostic.is_unnecessary
+                    && entry.diagnostic.severity <= DiagnosticSeverity::WARNING
                     && !entry.range.is_empty()
                     && Some(entry.range.end) != active_primary_range.as_ref().map(|r| *r.end())
                 {
diff --git a/crates/editor/src/element.rs b/crates/editor/src/element.rs
index 1aed9791c4..ad8057db4e 100644
--- a/crates/editor/src/element.rs
+++ b/crates/editor/src/element.rs
@@ -21,7 +21,7 @@ use gpui::{
     MutableAppContext, PaintContext, Quad, Scene, SizeConstraint, ViewContext, WeakViewHandle,
 };
 use json::json;
-use language::Bias;
+use language::{Bias, DiagnosticSeverity};
 use smallvec::SmallVec;
 use std::{
     cmp::{self, Ordering},
@@ -665,19 +665,22 @@ impl EditorElement {
                     }
                 }
 
-                let mut diagnostic_highlight = HighlightStyle {
-                    ..Default::default()
-                };
+                let mut diagnostic_highlight = HighlightStyle::default();
 
                 if chunk.is_unnecessary {
                     diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
-                } else if let Some(severity) = chunk.diagnostic_severity {
-                    let diagnostic_style = super::diagnostic_style(severity, true, style);
-                    diagnostic_highlight.underline = Some(Underline {
-                        color: Some(diagnostic_style.message.text.color),
-                        thickness: 1.0.into(),
-                        squiggly: true,
-                    });
+                }
+
+                if let Some(severity) = chunk.diagnostic_severity {
+                    // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
+                    if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
+                        let diagnostic_style = super::diagnostic_style(severity, true, style);
+                        diagnostic_highlight.underline = Some(Underline {
+                            color: Some(diagnostic_style.message.text.color),
+                            thickness: 1.0.into(),
+                            squiggly: true,
+                        });
+                    }
                 }
 
                 if let Some(highlight_style) = highlight_style.as_mut() {