"Linking" two adjustment widgets?

[Daniel Haude <dunno stoptrick com>]

Hi there,

suppose I have a GtkHScrollbar and a GtkEntry both of which control the 
same numerical quantity. Whenever the user changes the position of the 
slider I want this change to be reflected in the GtkEntry and vice versa.

Obviously it won't do to connect the "changed" signals of each widget to 
callbacks that change the setting of the other widget because the other 
one in turn would emit a "changed" signal as well, creating an infinite 
loop.

Actually I find it strange that this isn't even in the FAQ, considering 
that many applications have such functionality.

In my case there may or may not be added complications because the entry 
setting and the slider setting don't have 1:1 correspondence but an 
exponential / loigarithmic one.

Thanks, --Daniel