svx a11y: Switch to override new extended attr helper for OLE shape

Override the OAccessible::implGetExtendedAttributes
base class method newly introduced in

    Change-Id: Ie66f135fbf6cdc98c7cdca27fa3f5fe7db7f9a74
    Author: Michael Weghorn <m.weghorn@posteo.de>
    Date:   Thu Mar 5 12:12:45 2026 +0100

        a11y: Introduce helper to implement XAccessibleExtendedAttributes logic

instead of manually implementing
XAccessibleExtendedAttributes::getExtendedAttributes, to
unify/deduplicate the string concatenation and locking logic
by having it implemented (only) in the base class implementation.

Change-Id: I12ce4776dc489dd87ee509b10c14da25a5139de6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/201047
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

include/svx/AccessibleOLEShape.hxx

@@ -59,9 +59,9 @@ public:
         css::accessibility::XAccessibleKeyBinding> SAL_CALL getAccessibleActionKeyBinding (
             sal_Int32 nIndex) override;
 
-// ====== XAccessibleExtendedAttributes =====================================
-    virtual OUString SAL_CALL getExtendedAttributes() override;
 protected:
+    virtual std::unordered_map<OUString, OUString> implGetExtendedAttributes() override;
+
     /// Create a name string that contains the accessible name.
     virtual OUString
         CreateAccessibleBaseName () override;

svx/source/accessibility/AccessibleOLEShape.cxx

@@ -71,13 +71,12 @@ Reference<XAccessibleKeyBinding> SAL_CALL AccessibleOLEShape::getAccessibleActio
     throw lang::IndexOutOfBoundsException();
 }
 
-// XAccessibleExtendedAttributes
-OUString SAL_CALL AccessibleOLEShape::getExtendedAttributes()
+std::unordered_map<OUString, OUString> AccessibleOLEShape::implGetExtendedAttributes()
 {
-    if (m_pShape)
-        return "style:" + static_cast<SdrOle2Obj*>(m_pShape)->GetStyleString() + ";";
+    if (!m_pShape)
+        return {};
 
-    return OUString();
+    return { { u"style"_ustr, static_cast<SdrOle2Obj*>(m_pShape)->GetStyleString() } };
 }
 
 /// Set this object's name if is different to the current name.