comphelper::OCommonAccessibleComponent's XAggregation is apparently unused

It had been using WeakAggComponentImplHelper2 ever since
2f79d5f4794ec7f076bb290702b4c9c0afb2a6c8 "initial checkin - helper for
implementing an XAccessibleContext", but all the classes that derive from it
(comphelper::OAccessibleComponentHelper,
comphelper::OAccessibleExtendedComponentHelper, and classes that in turn derive
from those) implement queryInterface (in a way not just forwarding to the base
class queryInterface, as would be required for classes implementing
XAggregation) rather than queryAggregation, so aggregation was broken and any
delegator would be ignored when calling queryInterface on one of the derived
classes.

Also, without this commit but instead with a local

> --- a/include/comphelper/accessiblecomponenthelper.hxx
> +++ b/include/comphelper/accessiblecomponenthelper.hxx
> @@ -49,6 +49,7 @@ namespace comphelper
>                  :public ::cppu::BaseMutex
>                  ,public OCommonAccessibleComponent_Base
>      {
> +        void SAL_CALL setDelegator(css::uno::Reference<css::uno::XInterface> const &) final { assert(false); }
>          friend class OContextEntryGuard;
>      private:
>          css::uno::WeakReference< css::accessibility::XAccessible > m_aCreator;         // the XAccessible which created our XAccessibleContext

on all of Linux, macOS, and Windows: `make check` still succeeded, and running
the resulting LibreOffice with the system in some assistive technology narration
mode produced audio, all without hitting that injected assert that should have
fired if the XAggregation mechanism had been used after all.

Change-Id: I47045824d0762a5f3de150a11576694621b163b0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/145330
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

2 files changed, 5 insertions, 4 deletions

diff --git a/include/comphelper/accessiblecomponenthelper.hxx b/include/comphelper/accessiblecomponenthelper.hxx
index 0c738d0e6df0..8743b322a4d8 100644
--- a/include/comphelper/accessiblecomponenthelper.hxx
+++ b/include/comphelper/accessiblecomponenthelper.hxx
@@ -26,7 +26,7 @@
 #include <com/sun/star/accessibility/XAccessibleExtendedComponent.hpp>
 #include <comphelper/accessibleeventnotifier.hxx>
 #include <cppuhelper/basemutex.hxx>
-#include <cppuhelper/compbase2.hxx>
+#include <cppuhelper/compbase.hxx>
 #include <cppuhelper/implbase1.hxx>
 #include <comphelper/uno3.hxx>
 #include <comphelper/comphelperdllapi.h>
@@ -38,9 +38,9 @@ namespace comphelper
 
     //= OCommonAccessibleComponent
 
-    typedef ::cppu::WeakAggComponentImplHelper2 <   css::accessibility::XAccessibleContext2,
-                                                    css::accessibility::XAccessibleEventBroadcaster
-                                                >   OCommonAccessibleComponent_Base;
+    typedef ::cppu::WeakComponentImplHelper <   css::accessibility::XAccessibleContext2,
+                                                css::accessibility::XAccessibleEventBroadcaster
+                                            >   OCommonAccessibleComponent_Base;
 
     /** base class encapsulating common functionality for the helper classes implementing
         the XAccessibleComponent respectively XAccessibleExtendendComponent
diff --git a/svx/source/inc/charmapacc.hxx b/svx/source/inc/charmapacc.hxx
index 3831c3485ccf..201f53db3f37 100644
--- a/svx/source/inc/charmapacc.hxx
+++ b/svx/source/inc/charmapacc.hxx
@@ -23,6 +23,7 @@
 #include <comphelper/accessibleselectionhelper.hxx>
 #include <com/sun/star/accessibility/XAccessibleAction.hpp>
 #include <com/sun/star/accessibility/XAccessibleTable.hpp>
+#include <cppuhelper/implbase2.hxx>
 #include <tools/gen.hxx>
 #include <rtl/ref.hxx>