[XForms] slider does not respond to right mouse click

[jos]

Hi all,

just a quick question.

I've been tinkering on some software I wrote many years ago for a few 
days now, adding some new features.

I've noticed that when I use a slider I can not distinguish it being 
clicked by a left or a right mouse button. For a row of sliders I used a 
left mouse click for normal setting and a right mouse click to set a 
slider with a value which depended on its neighbouring sliders.

This used to work fine when I built earlier versions of the program. But 
now it does not anymore. Odd thing is that if I print the value of 
fl_mouse_button() I only see left mouse button clicks. I can see the 
left or the right buttons being clicked on buttons and panels etc. but 
not on sliders.

Have there been any changes in the library (I'm linking to 
libforms.so.2.0.0) in this respect over the years that I'm not aware of? 
The manual says nothing of the sort.
It mentions that for positioners one can set which mouse button it 
should respond to, but I could not find a similar function for a slider.
Anyone know of a remedy?

Best regards,

Jos