LibGUI: Ensure that edit actions are disabled for password boxes

This ensures that the user can't copy/cut text from password boxes which
would reveal the password. It also makes sure that the undo/redo actions
stay disabled because it's difficult to reason about what these do
exactly without being able to see the result.

Userland/Libraries/LibGUI/TextBox.cpp

@@ -77,8 +77,7 @@ PasswordBox::PasswordBox()
  : TextBox()
 {
  set_substitution_code_point('*');
- undo_action().set_enabled(false);
- redo_action().set_enabled(false);
+ set_text_is_secret(true);
 }
 
 }

Userland/Libraries/LibGUI/TextEditor.cpp

@@ -1478,7 +1478,7 @@ void TextEditor::set_mode(const Mode mode)
  m_mode = mode;
  switch (mode) {
  case Editable:
- m_cut_action->set_enabled(has_selection());
+ m_cut_action->set_enabled(has_selection() && !text_is_secret());
  m_delete_action->set_enabled(true);
  m_paste_action->set_enabled(true);
  set_accepts_emoji_input(true);
@@ -1502,8 +1502,8 @@ void TextEditor::set_mode(const Mode mode)
 
 void TextEditor::did_update_selection()
 {
- m_cut_action->set_enabled(is_editable() && has_selection());
- m_copy_action->set_enabled(has_selection());
+ m_cut_action->set_enabled(is_editable() && has_selection() && !text_is_secret());
+ m_copy_action->set_enabled(has_selection() && !text_is_secret());
  if (on_selection_change)
  on_selection_change();
  if (is_wrapping_enabled()) {
@@ -1774,8 +1774,8 @@ void TextEditor::document_did_update_undo_stack()
  return builder.to_string();
  };
 
- m_undo_action->set_enabled(can_undo());
- m_redo_action->set_enabled(can_redo());
+ m_undo_action->set_enabled(can_undo() && !text_is_secret());
+ m_redo_action->set_enabled(can_redo() && !text_is_secret());
 
  m_undo_action->set_text(make_action_text("&Undo", document().undo_stack().undo_action_text()));
  m_redo_action->set_text(make_action_text("&Redo", document().undo_stack().redo_action_text()));
@@ -1980,4 +1980,11 @@ void TextEditor::redo()
  document().redo();
 }
 
+void TextEditor::set_text_is_secret(bool text_is_secret)
+{
+ m_text_is_secret = text_is_secret;
+ document_did_update_undo_stack();
+ did_update_selection();
+}
+
 }

Userland/Libraries/LibGUI/TextEditor.h

@@ -203,6 +203,9 @@ class TextEditor
 
  void delete_text_range(TextRange);
 
+ bool text_is_secret() const { return m_text_is_secret; }
+ void set_text_is_secret(bool text_is_secret);
+
 protected:
  explicit TextEditor(Type = Type::MultiLine);
 
@@ -387,6 +390,8 @@ class TextEditor
  Gfx::IntPoint m_last_mousemove_position;
 
  RefPtr<Gfx::Bitmap> m_icon;
+
+ bool m_text_is_secret { false };
 };
 
 }