Hi James,

 

Checking the source, it means the following:

 

The code allocate a buffer 6 times bigger than the original string length to able to hold the escaped form of the utf-8 character.

 

The assert means, that the string, after escaping was not fit into this buffer for some reason. Or, to be more precise, the GString implementation decided that it should reallocate the string, which usually only happen if the string gets too big to fit into its original place. Currently I have no recent glib source to check if I’m right.

 

The original string could help a lot to find the root cause.

 

Ps.: the escaping works as replacing the original byte with \xHH, so theoretically it can only grows from 1 byte to 4, which should fit into a buffer 6 times bigger than the original size.