Fix to avoid negative width assertion when drawing fitted text in very deep TreeView file trees.

modules/juce_gui_basics/widgets/juce_TreeView.cpp

@@ -861,7 +861,7 @@ void TreeView::recalculateIfNeeded()
         if (rootItem != nullptr)
         {
             viewport->getViewedComponent()
-                ->setSize (jmax (viewport->getMaximumVisibleWidth(), rootItem->totalWidth),
+                ->setSize (jmax (viewport->getMaximumVisibleWidth(), rootItem->totalWidth + 50),
                            rootItem->totalHeight - (rootItemVisible ? 0 : rootItem->itemHeight));
         }
         else