LibGUI: Add TextEditor::force_rehighlight() method

Userland/Libraries/LibGUI/TextEditor.cpp

@@ -1902,6 +1902,11 @@ void TextEditor::rehighlight_if_needed()
 {
     if (!m_needs_rehighlight)
         return;
+    force_rehighlight();
+}
+
+void TextEditor::force_rehighlight()
+{
     if (m_highlighter)
         m_highlighter->rehighlight(palette());
     m_needs_rehighlight = false;
@@ -1912,6 +1917,11 @@ Syntax::Highlighter const* TextEditor::syntax_highlighter() const
     return m_highlighter.ptr();
 }
 
+Syntax::Highlighter* TextEditor::syntax_highlighter()
+{
+    return m_highlighter.ptr();
+}
+
 void TextEditor::set_syntax_highlighter(OwnPtr<Syntax::Highlighter> highlighter)
 {
     if (m_highlighter)

Userland/Libraries/LibGUI/TextEditor.h

@@ -175,6 +175,7 @@ public:
     void set_cursor(size_t line, size_t column);
     virtual void set_cursor(TextPosition const&);
 
+    Syntax::Highlighter* syntax_highlighter();
     Syntax::Highlighter const* syntax_highlighter() const;
     void set_syntax_highlighter(OwnPtr<Syntax::Highlighter>);
 
@@ -209,6 +210,7 @@ public:
 
     bool text_is_secret() const { return m_text_is_secret; }
     void set_text_is_secret(bool text_is_secret);
+    void force_rehighlight();
 
 protected:
     explicit TextEditor(Type = Type::MultiLine);