3 files changed, 21 insertions, 3 deletions
diff --git a/alacritty_terminal/src/ansi.rs b/alacritty_terminal/src/ansi.rs
index 51a3394e..d5574f59 100644
--- a/alacritty_terminal/src/ansi.rs
+++ b/alacritty_terminal/src/ansi.rs
@@ -768,8 +768,10 @@ pub enum Attr {
     Underline,
     /// Underlined twice.
     DoubleUnderline,
-    /// Underlined twice.
+    /// Undercurl twice.
     Undercurl,
+    /// Underlined with dots.
+    DottedUnderline,
     /// Blink cursor slowly.
     BlinkSlow,
     /// Blink cursor fast.
@@ -971,6 +973,7 @@ where
                         .trim()
                         .to_owned();
                     self.handler.set_title(Some(title));
+                    
                     return;
                 }
                 unhandled(params);
@@ -1325,6 +1328,7 @@ fn attrs_from_sgr_parameters(params: &mut ParamsIter<'_>) -> Vec<Option<Attr>> {
             [4, 0] => Some(Attr::CancelUnderline),
             [4, 2] => Some(Attr::DoubleUnderline),
             [4, 3] => Some(Attr::Undercurl),
+            [4, 4] => Some(Attr::DottedUnderline),
             [4, ..] => Some(Attr::Underline),
             [5] => Some(Attr::BlinkSlow),
             [6] => Some(Attr::BlinkFast),
diff --git a/alacritty_terminal/src/term/cell.rs b/alacritty_terminal/src/term/cell.rs
index 4f5ac1e2..a393b332 100644
--- a/alacritty_terminal/src/term/cell.rs
+++ b/alacritty_terminal/src/term/cell.rs
@@ -25,7 +25,8 @@ bitflags! {
         const LEADING_WIDE_CHAR_SPACER  = 0b0000_0100_0000_0000;
         const DOUBLE_UNDERLINE          = 0b0000_1000_0000_0000;
         const UNDERCURL                 = 0b0001_0000_0000_0000;
-        const OVERLINE                  = 0b0010_0000_0000_0000;
+        const DOTTED_UNDERLINE          = 0b0010_0000_0000_0000;
+        const OVERLINE                  = 0b0100_0000_0000_0000;
     }
 }
 
@@ -125,6 +126,7 @@ impl GridCell for Cell {
                     | Flags::UNDERLINE
                     | Flags::DOUBLE_UNDERLINE
                     | Flags::UNDERCURL
+                    | Flags::DOTTED_UNDERLINE
                     | Flags::OVERLINE
                     | Flags::STRIKEOUT
                     | Flags::WRAPLINE
diff --git a/alacritty_terminal/src/term/mod.rs b/alacritty_terminal/src/term/mod.rs
index 5a641a7b..ba170e32 100644
--- a/alacritty_terminal/src/term/mod.rs
+++ b/alacritty_terminal/src/term/mod.rs
@@ -1514,21 +1514,33 @@ impl<T: EventListener> Handler for Term<T> {
             Attr::Underline => {
                 cursor.template.flags.remove(Flags::DOUBLE_UNDERLINE);
                 cursor.template.flags.remove(Flags::UNDERCURL);
+                cursor.template.flags.remove(Flags::DOTTED_UNDERLINE);
                 cursor.template.flags.insert(Flags::UNDERLINE);
             },
             Attr::DoubleUnderline => {
                 cursor.template.flags.remove(Flags::UNDERLINE);
                 cursor.template.flags.remove(Flags::UNDERCURL);
+                cursor.template.flags.remove(Flags::DOTTED_UNDERLINE);
                 cursor.template.flags.insert(Flags::DOUBLE_UNDERLINE);
             },
             Attr::Undercurl => {
                 cursor.template.flags.remove(Flags::UNDERLINE);
                 cursor.template.flags.remove(Flags::DOUBLE_UNDERLINE);
+                cursor.template.flags.remove(Flags::DOTTED_UNDERLINE);
                 cursor.template.flags.insert(Flags::UNDERCURL);
             },
+            Attr::DottedUnderline => {
+                cursor.template.flags.remove(Flags::UNDERLINE);
+                cursor.template.flags.remove(Flags::DOUBLE_UNDERLINE);
+                cursor.template.flags.remove(Flags::UNDERCURL);
+                cursor.template.flags.insert(Flags::DOTTED_UNDERLINE);
+            },
             Attr::CancelUnderline => {
                 cursor.template.flags.remove(
-                    Flags::UNDERLINE | Flags::DOUBLE_UNDERLINE | Flags::UNDERCURL);
+                    Flags::UNDERLINE |
+                    Flags::DOUBLE_UNDERLINE |
+                    Flags::UNDERCURL |
+                    Flags::DOTTED_UNDERLINE);
             },
             Attr::Overline => {
                 cursor.template.flags.insert(Flags::OVERLINE);