Move a window without a title bar

I've been working on a patch recently which I've removed the title bar - using 'notitle' to [thispatcher]. The only downside to this is that the window is now immovable.

I've experimented with [mousestate] and the 'window size' message although this causes problems with the appearance of the patch when the window gets moved. Can anyone suggest an elegant way of moving the window without bringing back the title bar?

I'd love to hear any suggestions, thanks!

PS

For my [mousestate] experiment I incorporated a little 'move window' icon into my GUI and I'd like to maintain an indicator like this if possible.