LibGUI: Update ShellSyntaxHighlighter to also highlight brace expansions

Author: https://github.com/alimpfard
Commit: 107a083b5a
Pull-request: https://github.com/SerenityOS/serenity/pull/3835
Issue: https://github.com/SerenityOS/serenity/issues/3832
Reviewed-by: https://github.com/bugaevc
Reviewed-by: https://github.com/linusg

Libraries/LibGUI/ShellSyntaxHighlighter.cpp

@@ -140,6 +140,10 @@ private:
         span.color = m_palette.syntax_punctuation();
         span.font = &Gfx::Font::default_bold_fixed_width_font();
     }
+    virtual void visit(const AST::BraceExpansion* node) override
+    {
+        NodeVisitor::visit(node);
+    }
     virtual void visit(const AST::BarewordLiteral* node) override
     {
         NodeVisitor::visit(node);
@@ -350,6 +354,15 @@ private:
     {
         NodeVisitor::visit(node);
     }
+    virtual void visit(const AST::Range* node) override
+    {
+        NodeVisitor::visit(node);
+
+        auto& span = span_for_node(node->start());
+        span.range.set_start(span.range.end());
+        set_offset_range_end(span.range, node->start()->position().end_line, 2);
+        span.color = m_palette.syntax_punctuation();
+    }
     virtual void visit(const AST::ReadRedirection* node) override
     {
         NodeVisitor::visit(node);