setProp question

[Neville Smythe]

Is there any way to intercept setProp messages for properties you *don’t* want to set?

I find with my poor typing skills I keep typing

Set the <NonexistentProperty> of <something>

where NonexistentProperty is a mistype of SomePropertyWhichHasASetPropHandler

and so I keep creating lots of superfluous properties for the object. Annoying and sometime painful to clean up.
When you are initially creating the object properties this is not a problem but once the structure is set up I'd like to declare “enough”, maybe with a LockProperties command
(come to think of it locking changes to existing properties might be useful too, though that can be coded into each SetProp handler)

Also, on another topic: my LiveCode windows have suddenly acquired a second title line, which when dragged tends to miniaturise the window and then display it somewhere else or at full screen, and each time a script editor window is opened it is moved higher up the screen until it moves under the menubar and becomes unusable. Looks look a system thing (Mac High Sierra) but I’ve never seen it before and only just changed to LC9.0.1. Any suggestions as to how to stop this major annoyance would be appreciated - or at least configure it if it really is a new LC ”feature".