Convert SfxShellStack_Impl from SfxPtrArr to std::vector

Change-Id: I1ffd615a505029242a87337c9ef42c8156c42d70
Reviewed-on: https://gerrit.libreoffice.org/3394Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

sfx2/inc/sfx2/dispatch.hxx

@@ -28,11 +28,11 @@
 #include <sfx2/bindings.hxx>
 #include <sfx2/viewfrm.hxx>
 #include <map>
+#include <vector>
 
 class SfxSlotServer;
 class SfxShell;
 class SfxRequest;
-class SfxShellStack_Impl;
 class SfxHintPoster;
 class SfxViewFrame;
 class SfxBindings;
@@ -41,6 +41,8 @@ class SfxPopupMenuManager;
 class SfxModule;
 struct SfxDispatcher_Impl;
 
+typedef std::vector<SfxShell*> SfxShellStack_Impl;
+
 namespace com
 {
     namespace sun