Add wxProgressDialog::Was{Cancelled,Skipped}() convenience methods.

Although the information about "Cancel" and "Skip" buttons presses is returned
from Update(), sometimes it may be more convenient to ask the dialog about
whether it was cancelled or skipped instead of storing it in the program
itself.

Add the methods which allow to check for this.

Closes #10903.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64057 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/progdlg.h

@@ -137,6 +137,32 @@ public:
     */
     void SetRange(int maximum);
 
+
+      /**
+         Returns true if the "Cancel" button was pressed.
+
+         Normally a Cancel button press is indicated by Update() returning
+         @false but sometimes it may be more convenient to check if the dialog
+         was cancelled from elsewhere in the code and this function allows to
+         do it.
+
+         It always returns @false if the Cancel button is not shown at all.
+
+         @since 2.9.1
+     */
+    bool WasCancelled() const;
+
+     /**
+         Returns true if the "Skip" button was pressed.
+
+         This is similar to WasCancelled() but returns @true if the "Skip"
+         button was pressed, not the "Cancel" one.
+
+         @since 2.9.1
+     */
+    bool WasSkipped() const;
+
+
     /**
         Updates the dialog, setting the progress bar to the new value and
         updating the message if new one is specified.