Change to a KEY_DOWN event instead of CHAR event

This should prevent pasting and backspace as well.

src/widgets/wxTextCtrlWrapper.h

@@ -33,17 +33,19 @@ public:
    {
       mReadOnly = false;
 
-      Bind(wxEVT_CHAR, [&](wxKeyEvent &event)
+      Bind(wxEVT_KEY_DOWN, [&](wxKeyEvent &event)
       {
-         auto keyCode = event.GetUnicodeKey();
+         auto keyCode = event.GetKeyCode();
-         if (!mReadOnly || keyCode < WXK_SPACE || keyCode == WXK_DELETE)
+         if (mReadOnly)
          {
-            event.Skip();
+            if (keyCode >= WXK_SPACE || keyCode == WXK_DELETE || keyCode == WXK_BACK)
-         }
-         else
             {
                event.Skip(false);
+               return;
             }
+         }
+
+         event.Skip();
       });
    };