LibWeb: Also invalidate placeholder style on focus change

Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp

@@ -1137,6 +1137,9 @@ void HTMLInputElement::did_receive_focus()
         return;
     m_text_node->invalidate_style();
 
+    if (m_placeholder_text_node)
+        m_placeholder_text_node->invalidate_style();
+
     document().set_cursor_position(DOM::Position::create(realm(), *m_text_node, 0));
 }
 
@@ -1145,6 +1148,9 @@ void HTMLInputElement::did_lose_focus()
     if (m_text_node)
         m_text_node->invalidate_style();
 
+    if (m_placeholder_text_node)
+        m_placeholder_text_node->invalidate_style();
+
     commit_pending_changes();
 }
 

Userland/Libraries/LibWeb/HTML/HTMLTextAreaElement.cpp

@@ -72,6 +72,9 @@ void HTMLTextAreaElement::did_receive_focus()
         return;
     m_text_node->invalidate_style();
 
+    if (m_placeholder_text_node)
+        m_placeholder_text_node->invalidate_style();
+
     document().set_cursor_position(DOM::Position::create(realm(), *m_text_node, 0));
 }
 
@@ -80,6 +83,9 @@ void HTMLTextAreaElement::did_lose_focus()
     if (m_text_node)
         m_text_node->invalidate_style();
 
+    if (m_placeholder_text_node)
+        m_placeholder_text_node->invalidate_style();
+
     // The change event fires when the value is committed, if that makes sense for the control,
     // or else when the control loses focus
     queue_an_element_task(HTML::Task::Source::UserInteraction, [this] {