GItemView: Elide item names that won't fit

This isn't perfect since now you will just see "Long name..." instead
of the whole name, but at least it doesn't look totally wrong either.

Libraries/LibGUI/GItemView.cpp

@@ -167,6 +167,7 @@ void GItemView::paint_event(GPaintEvent& event)
         Rect text_rect { 0, icon_rect.bottom() + 6 + 1, font.width(item_text.to_string()), font.glyph_height() };
         text_rect.center_horizontally_within(item_rect);
         text_rect.inflate(6, 4);
+        text_rect.intersect(item_rect);
 
         Color text_color;
         if (is_selected_item)
@@ -174,7 +175,7 @@ void GItemView::paint_event(GPaintEvent& event)
         else
             text_color = model()->data(model_index, GModel::Role::ForegroundColor).to_color(Color::Black);
         painter.fill_rect(text_rect, background_color);
-        painter.draw_text(text_rect, item_text.to_string(), font, TextAlignment::Center, text_color);
+        painter.draw_text(text_rect, item_text.to_string(), font, TextAlignment::Center, text_color, TextElision::Right);
     };
 }