LibGUI: Fix scroll_into_view flipping between left/top and right/bottom

This fixes flipping between left/top and right/bottom when the rectangle
to make visible doesn't fit into the visible portion each time the
function is called.

Libraries/LibGUI/AbstractView.cpp

@@ -438,10 +438,8 @@ void AbstractView::set_cursor(ModelIndex index, SelectionUpdate selection_update
 
         m_cursor_index = index;
 
-        if (scroll_cursor_into_view) {
-            // FIXME: We should scroll into view both vertically *and* horizontally.
-            scroll_into_view(index, false, true);
-        }
+        if (scroll_cursor_into_view)
+            scroll_into_view(index, true, true);
         update();
     }
 }

Libraries/LibGUI/ScrollableWidget.cpp

@@ -180,14 +180,14 @@ void ScrollableWidget::scroll_into_view(const Gfx::IntRect& rect, bool scroll_ho
     if (scroll_vertically) {
         if (rect.top() < visible_content_rect.top()) {
             m_vertical_scrollbar->set_value(rect.top());
-        } else if (rect.bottom() > visible_content_rect.bottom()) {
+        } else if (rect.top() > visible_content_rect.top() && rect.bottom() > visible_content_rect.bottom()) {
             m_vertical_scrollbar->set_value(rect.bottom() - visible_content_rect.height() + 1);
         }
     }
     if (scroll_horizontally) {
         if (rect.left() < visible_content_rect.left()) {
             m_horizontal_scrollbar->set_value(rect.left());
-        } else if (rect.right() > visible_content_rect.right()) {
+        } else if (rect.left() > visible_content_rect.left() && rect.right() > visible_content_rect.right()) {
             m_horizontal_scrollbar->set_value(rect.right() - visible_content_rect.width() + 1);
         }
     }