Add wxIcon::CreateFromHICON() to wxMSW.

Provide a public method properly assigning an HICON to wxIcon, instead of
asking people to call SetHICON() and SetSize().

Closes #15023.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73489 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/icon.h

@@ -179,6 +179,22 @@ public:
     */
     virtual ~wxIcon();
 
+    /**
+        Attach a Windows icon handle.
+
+        This wxMSW-specific method allows to assign a native Windows @c HICON
+        (which must be castes to @c WXHICON opaque handle type) to wxIcon.
+        Notice that this means that the @c HICON will be destroyed by wxIcon
+        when it is destroyed.
+
+        @return @true if successful.
+
+        @onlyfor{wxmsw}
+
+        @since 2.9.5
+    */
+    bool CreateFromHICON(WXHICON icon);
+
     /**
         Returns disabled (dimmed) version of the icon.