tdf#121855 like osx case don't search near-infinite calc grid for focus

Change-Id: Ie6bccd2781fbbdc5f4d5dc2eb6903191aafe8265
Reviewed-on: https://gerrit.libreoffice.org/64521
Tested-by: Jenkins
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
(cherry picked from commit 78c52b1a)

vcl/osx/a11ywrapper.mm

@@ -992,7 +992,7 @@ Reference < XAccessibleContext > hitTestRunner ( css::awt::Point point,
             bool bSafeToIterate = true;
             sal_Int32 nCount = rxAccessibleContext -> getAccessibleChildCount();
 
-            if ( nCount < 0 || nCount > SAL_MAX_UINT16 /* slow enough for anyone */ )
+            if (nCount < 0 || nCount > SAL_MAX_UINT16 /* slow enough for anyone */)
                 bSafeToIterate = false;
             else { // manages descendants is an horror from the a11y standards guys.
                 Reference< XAccessibleStateSet > xStateSet;

vcl/unx/gtk/gtksalframe.cxx

@@ -3757,6 +3757,13 @@ uno::Reference<accessibility::XAccessibleEditableText>
         }
     }
 
+    bool bSafeToIterate = true;
+    sal_Int32 nCount = xContext->getAccessibleChildCount();
+    if (nCount < 0 || nCount > SAL_MAX_UINT16 /* slow enough for anyone */)
+        bSafeToIterate = false;
+    if (!bSafeToIterate)
+        return uno::Reference< accessibility::XAccessibleEditableText >();
+
     for (sal_Int32 i = 0; i < xContext->getAccessibleChildCount(); ++i)
     {
         uno::Reference< accessibility::XAccessible > xChild = xContext->getAccessibleChild(i);

vcl/unx/gtk3/gtk3gtkframe.cxx

@@ -4153,6 +4153,13 @@ uno::Reference<accessibility::XAccessibleEditableText>
         }
     }
 
+    bool bSafeToIterate = true;
+    sal_Int32 nCount = xContext->getAccessibleChildCount();
+    if (nCount < 0 || nCount > SAL_MAX_UINT16 /* slow enough for anyone */)
+        bSafeToIterate = false;
+    if (!bSafeToIterate)
+        return uno::Reference< accessibility::XAccessibleEditableText >();
+
     for (sal_Int32 i = 0; i < xContext->getAccessibleChildCount(); ++i)
     {
         uno::Reference< accessibility::XAccessible > xChild = xContext->getAccessibleChild(i);