LibGUI: Remove calculated_min_size() for ListViews

Originally implemented to handle resizable ComboBox windows, this
"feature" no longer exists, so calculating min size is no longer
necessary. The calculation was also failing to account for dynamic
ListViews properly.

This patch simplifies things by setting ComboBox ListView's minimum size
explicitly and deferring to AbstractScrollableWidget's more flexible
calculated implementation otherwise.

Fixes FontPicker resizing incorrectly due to overly rigid ListViews.

Userland/Libraries/LibGUI/ComboBox.cpp

@@ -257,6 +257,7 @@ void ComboBox::open()
     }
     rect.intersect(desktop);
     m_list_window->set_rect(rect);
+    m_list_view->set_min_size(rect.size());
 
     if (m_selected_index.has_value())
         m_list_view->set_cursor(m_selected_index.value(), AbstractView::SelectionUpdate::Set);

Userland/Libraries/LibGUI/ListView.cpp

@@ -44,7 +44,6 @@ void ListView::update_content_size()
         auto text = model()->index(row, m_model_column).data();
         content_width = max(content_width, font().width(text.to_deprecated_string()) + horizontal_padding() * 2);
     }
-    m_max_item_width = content_width;
     content_width = max(content_width, widget_inner_rect().width());
 
     int content_height = item_count() * item_height();
@@ -268,15 +267,4 @@ void ListView::scroll_into_view(ModelIndex const& index, bool scroll_horizontall
     AbstractScrollableWidget::scroll_into_view(content_rect(index.row()), scroll_horizontally, scroll_vertically);
 }
 
-Optional<UISize> ListView::calculated_min_size() const
-{
-    auto min_width = horizontal_scrollbar().effective_min_size().width().as_int() + vertical_scrollbar().width() + frame_thickness() * 2;
-    auto min_height = vertical_scrollbar().effective_min_size().height().as_int() + horizontal_scrollbar().height() + frame_thickness() * 2;
-    auto content_exceeds_minimums = content_width() > min_width && content_height() > min_height;
-    auto scrollbars_are_visible = horizontal_scrollbar().is_visible() && vertical_scrollbar().is_visible();
-    if (content_exceeds_minimums || scrollbars_are_visible)
-        return AbstractScrollableWidget::calculated_min_size();
-    return { { m_max_item_width + frame_thickness() * 2, content_height() + frame_thickness() * 2 } };
-}
-
 }

Userland/Libraries/LibGUI/ListView.h

@@ -56,15 +56,12 @@ private:
     virtual void mousemove_event(MouseEvent&) override;
     virtual void layout_relevant_change_occurred() override;
 
-    virtual Optional<UISize> calculated_min_size() const override;
-
     Gfx::IntRect content_rect(int row) const;
     void update_content_size();
 
     int m_horizontal_padding { 2 };
     int m_vertical_padding { 2 };
     int m_model_column { 0 };
-    int m_max_item_width { 0 };
     bool m_alternating_row_colors { true };
     bool m_hover_highlighting { false };
 };