> possibly manifest the same bug, e.g. my recent fl_text_extents() mod ?

To reply this specific question ; I would say YES it can happen in your code 
IMHO because it heavily relies on fl_gc which has proven to be sometimes NULL 
(even if for a short period of time most of the time)
Note that my defensive approach consisting of providing a valid hdc in most 
situations will limit (quite a lot) such problem to cause a bug but may not 
prevent it as I said in my last reply especially if we happen to use these kind 
of api for non screen surfaces with different dpi as an example.

Ideally, we should change those API like fl_width(), fl_text_extents() and the 
like ; to include a gc parameter so that we force the developer to assume the 
responsibility for providing a valid one each time we use it.
I thought about that one but didn't dare to make such a change because of the 
large regression risk in the code as it would represent many changes as you can 
guess.

Hope this will help,
Fabien.

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