What version are you using now as your "current version"?
I'm using Windows--that may be the difference here--but in FMP 15, any changes that I make to increase or decrease the space needed for text in a text object on a layout, deleting/adding characters, changing the size, changing to/from Bold, all result in the text object auto-sizing for me with no need for added interaction on my part.
This is not always a good thing as I often find that I have to manually resize the text object to make it a bit larger when designing layouts for iOS use as the text seems to need a few pixels more space than what I've created in this fashion on my layout.
Thanks for the input!
I'm on FM15 on Mac. It has been like this since version 13 or 14 I think.
And yes, it's not always ideal. The autosize should be something like "minimum size +5 pixels in width and height". – But I guess that's too hard for Filemaker Inc to implement....