Make Ctrl+'A' to Ctrl+'Z' working again (Issue specific to Windows and Linux)

Fixes: lp:1804326
https://bugs.launchpad.net/kicad/+bug/1804326

common/tool/tool_dispatcher.cpp

@@ -397,7 +397,16 @@ void TOOL_DISPATCHER::DispatchWxEvent( wxEvent& aEvent )
             // char events for ASCII letters in this case carry codes corresponding to the ASCII
             // value of Ctrl-Latter, i.e. 1 for Ctrl-A, 2 for Ctrl-B and so on until 26 for Ctrl-Z.
             // They are remapped here to be more easy to handle in code
+            // Note also on OSX wxWidgets has a differnt behavior and the mapping is made
+            // only for ctrl+'A' to ctlr+'Z' (unicode code return 'A' to 'Z').
+            // Others OS return WXK_CONTROL_A to WXK_CONTROL_Z, and Ctrl+'M' returns the same code as
+            // the return key, so the remapping does not use the unicode key value.
+#ifdef __APPLE__
             if( unicode >= 'A' && unicode <= 'Z' && key >= WXK_CONTROL_A && key <= WXK_CONTROL_Z )
+#else
+            (void) unicode; //not used: avoid compil warning
+            if( key >= WXK_CONTROL_A && key <= WXK_CONTROL_Z )
+#endif
                 key += 'A' - 1;
         }