BaseFileFilter: export Iterator

and deinline dtor. It saves 1 copy.
Similar to 184695be92

Change-Id: I2a55b00aa65bc3d0ac7f45d7321ea099882c776e
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/coreplugin/locator/basefilefilter.cpp

@@ -72,6 +72,9 @@ public:
 } // Internal
 } // Core
 
+BaseFileFilter::Iterator::~Iterator()
+{}
+
 BaseFileFilter::BaseFileFilter()
   : d(new Internal::BaseFileFilterPrivate)
 {

src/plugins/coreplugin/locator/basefilefilter.h

@@ -45,9 +45,9 @@ class CORE_EXPORT BaseFileFilter : public ILocatorFilter
     Q_OBJECT
 
 public:
-    class Iterator {
+    class CORE_EXPORT Iterator {
     public:
-        virtual ~Iterator() { }
+        virtual ~Iterator();
         virtual void toFront() = 0;
         virtual bool hasNext() const = 0;
         virtual QString next() = 0;