1 files changed, 19 insertions, 18 deletions

diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
index 3bb0d08da9..a01104a8e3 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
@@ -74,10 +74,13 @@ QT_BEGIN_NAMESPACE
 
 using namespace QWindowsUiAutomation;
 
+QMutex QWindowsUiaMainProvider::m_mutex;
 
 // Returns a cached instance of the provider for a specific acessible interface.
 QWindowsUiaMainProvider *QWindowsUiaMainProvider::providerForAccessible(QAccessibleInterface *accessible)
 {
+    QMutexLocker locker(&m_mutex);
+
     if (!accessible)
         return nullptr;
 
@@ -108,19 +111,11 @@ void QWindowsUiaMainProvider::notifyFocusChange(QAccessibleEvent *event)
 {
     if (QAccessibleInterface *accessible = event->accessibleInterface()) {
         // If this is a table/tree/list, raise event for the focused cell/item instead.
-        if (accessible->tableInterface()) {
-            int count = accessible->childCount();
-            for (int i = 0; i < count; ++i) {
-                QAccessibleInterface *item = accessible->child(i);
-                if (item && item->isValid() && item->state().focused) {
-                    accessible = item;
-                    break;
-                }
-            }
-        }
-        if (QWindowsUiaMainProvider *provider = providerForAccessible(accessible)) {
+        if (accessible->tableInterface())
+            if (QAccessibleInterface *child = accessible->focusChild())
+                accessible = child;
+        if (QWindowsUiaMainProvider *provider = providerForAccessible(accessible))
             QWindowsUiaWrapper::instance()->raiseAutomationEvent(provider, UIA_AutomationFocusChangedEventId);
-        }
     }
 }
 
@@ -214,12 +209,16 @@ void QWindowsUiaMainProvider::notifyValueChange(QAccessibleValueChangeEvent *eve
 void QWindowsUiaMainProvider::notifyNameChange(QAccessibleEvent *event)
 {
     if (QAccessibleInterface *accessible = event->accessibleInterface()) {
-        if (QWindowsUiaMainProvider *provider = providerForAccessible(accessible)) {
-            VARIANT oldVal, newVal;
-            clearVariant(&oldVal);
-            setVariantString(accessible->text(QAccessible::Name), &newVal);
-            QWindowsUiaWrapper::instance()->raiseAutomationPropertyChangedEvent(provider, UIA_NamePropertyId, oldVal, newVal);
-            ::SysFreeString(newVal.bstrVal);
+        // Restrict notification to combo boxes, which need it for accessibility,
+        // in order to avoid slowdowns with unnecessary notifications.
+        if (accessible->role() == QAccessible::ComboBox) {
+            if (QWindowsUiaMainProvider *provider = providerForAccessible(accessible)) {
+                VARIANT oldVal, newVal;
+                clearVariant(&oldVal);
+                setVariantString(accessible->text(QAccessible::Name), &newVal);
+                QWindowsUiaWrapper::instance()->raiseAutomationPropertyChangedEvent(provider, UIA_NamePropertyId, oldVal, newVal);
+                ::SysFreeString(newVal.bstrVal);
+            }
         }
     }
 }
@@ -275,6 +274,8 @@ ULONG QWindowsUiaMainProvider::AddRef()
 
 ULONG STDMETHODCALLTYPE QWindowsUiaMainProvider::Release()
 {
+    QMutexLocker locker(&m_mutex);
+
     if (!--m_ref) {
         delete this;
         return 0;