LibGUI: Only repaint the affected indices on AbstractView item hover

Previously, moving the cursor over items in an item view would cause it
to repaint itself completely. Now we only repaint the two affected
items (the old hovered item and the new hovered item.)

1 files changed, 6 insertions, 1 deletions

diff --git a/Userland/Libraries/LibGUI/AbstractView.cpp b/Userland/Libraries/LibGUI/AbstractView.cpp
index e3c704eefb..623e22355a 100644
--- a/Userland/Libraries/LibGUI/AbstractView.cpp
+++ b/Userland/Libraries/LibGUI/AbstractView.cpp
@@ -249,7 +249,12 @@ void AbstractView::set_hovered_index(const ModelIndex& index)
     auto old_index = m_hovered_index;
     m_hovered_index = index;
     did_change_hovered_index(old_index, index);
-    update();
+
+    if (old_index.is_valid())
+        update(to_widget_rect(paint_invalidation_rect(old_index)));
+
+    if (index.is_valid())
+        update(to_widget_rect(paint_invalidation_rect(index)));
 }
 
 void AbstractView::leave_event(Core::Event& event)