Utils: Make TreeViews use setUniformRowHeights by default

When applicable, the flag makes a significant difference in
performacnce. However is easily forgotten in cases where it
is applicable, and cases where it is accidentally used are
easily spotted visually. So arguably, opt-out is a better
default than opt-in.

Change-Id: I88aeb05b42533ba4e23c39573a3ddd016343cd55
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/coreplugin/find/searchresulttreeview.cpp

@@ -44,7 +44,6 @@ SearchResultTreeView::SearchResultTreeView(QWidget *parent)
 
     setItemDelegate(new SearchResultTreeItemDelegate(8, this));
     setIndentation(14);
-    setUniformRowHeights(true);
     setExpandsOnDoubleClick(true);
     header()->setSectionResizeMode(QHeaderView::ResizeToContents);
     header()->setStretchLastSection(false);

src/plugins/coreplugin/locator/locatorsettingspage.cpp

@@ -277,6 +277,7 @@ public:
         filterEdit->setFiltering(true);
 
         m_filterList = new TreeView;
+        m_filterList->setUniformRowHeights(false);
         m_filterList->setSelectionMode(QAbstractItemView::SingleSelection);
         m_filterList->setSelectionBehavior(QAbstractItemView::SelectRows);
         m_filterList->setSortingEnabled(true);

src/plugins/coreplugin/locator/locatorwidget.cpp

@@ -250,7 +250,6 @@ CompletionList::CompletionList(QWidget *parent)
 
     setItemDelegate(new CompletionDelegate(this));
     setRootIsDecorated(false);
-    setUniformRowHeights(true);
     header()->hide();
     header()->setStretchLastSection(true);
     // This is too slow when done on all results

src/plugins/coreplugin/opendocumentstreeview.cpp

@@ -81,7 +81,6 @@ OpenDocumentsTreeView::OpenDocumentsTreeView(QWidget *parent) :
     m_delegate = new Internal::OpenDocumentsDelegate(this);
     setItemDelegate(m_delegate);
     setRootIsDecorated(false);
-    setUniformRowHeights(true);
     setTextElideMode(Qt::ElideMiddle);
     setFrameStyle(QFrame::NoFrame);
     setAttribute(Qt::WA_MacShowFocusRect, false);

src/plugins/coreplugin/sessionview.cpp

@@ -36,6 +36,7 @@ void RemoveItemFocusDelegate::paint(QPainter* painter, const QStyleOptionViewIte
 SessionView::SessionView(QWidget *parent)
     : Utils::TreeView(parent)
 {
+    setUniformRowHeights(false);
     setItemDelegate(new RemoveItemFocusDelegate(this));
     setSelectionBehavior(QAbstractItemView::SelectRows);
     setSelectionMode(QAbstractItemView::ExtendedSelection);