OutputPane: Use setter for priority and fix default visibility

Do not show the buttons of output views with priority < 0 (instead of
only == -1). Reduce the number of buttons that are shown by default to
the essential ones.

Change-Id: I5b44f18537b3033ce9d616f044a8b54b76988783
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/todo/todooutputpane.cpp

@@ -28,6 +28,8 @@ TodoOutputPane::TodoOutputPane(TodoItemsModel *todoItemsModel, const Settings *s
 {
     setId("To-DoEntries");
     setDisplayName(Tr::tr("To-Do Entries"));
+    setPriorityInStatusBar(10);
+
     createTreeView();
     createScopeButtons();
     setScanningScope(ScanningScopeCurrentFile); // default
@@ -61,11 +63,6 @@ QList<QWidget*> TodoOutputPane::toolBarWidgets() const
     return widgets;
 }
 
-int TodoOutputPane::priorityInStatusBar() const
-{
-    return 1;
-}
-
 void TodoOutputPane::clearContents()
 {
     clearKeywordFilter();