added wxWindowDisabler ctor for conditionally disabling all windows and use it in WaitForChild()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52671 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/utilsunx.cpp

@@ -1447,8 +1447,7 @@ int wxGUIAppTraits::WaitForChild(wxExecuteData& execData)
     // prepare to wait for the child termination: show to the user that we're
     // busy and refuse all input unless explicitly told otherwise
     wxBusyCursor bc;
-    wxWindowDisabler *wd = flags & wxEXEC_NODISABLE ? NULL
-                                                    : new wxWindowDisabler;
+    wxWindowDisabler wd(!(flags & wxEXEC_NODISABLE));
 
     // endProcData.pid will be set to 0 from wxHandleProcessTermination() when
     // the process terminates
@@ -1480,8 +1479,6 @@ int wxGUIAppTraits::WaitForChild(wxExecuteData& execData)
         wxYield();
     }
 
-    delete wd;
-
     return endProcData.exitcode;
 }