Add wxConvAuto::IsFallbackEncoding()

include/wx/convauto.h

@@ -91,6 +91,12 @@ public:
         return m_bomType;
     }
 
+    // Return true if the fall-back encoding is used
+    bool IsFallbackEncoding() const
+    {
+        return m_ownsConv && m_bomType == wxBOM_None;
+    }
+
 private:
     // common part of all ctors
     void Init()

interface/wx/convauto.h

@@ -146,6 +146,13 @@ public:
     */
     wxBOM GetBOM() const;
 
+    /**
+        Check if the fall-back encoding is used.
+
+        @since 3.1.5
+    */
+    bool IsFallbackEncoding() const;
+
     /**
         Return a pointer to the characters that makes up this BOM.