from Sindre Mehus <mehus@darmstadt.gmd.de> :
>class Hourglass {
> Hourglass() // constructor, displays hourglass
> {
> fl_set_cursor(fl_winget(), XC_watch);
> XFlush(fl_get_display());
> }
It is a nice trick, but a bit unsafe as fl_winget() may
return bogus windows. fl_winget() is guranteed to return
a valid and correct window while in the object's handler, but
outside of a handler, it may return a bad window (say when
the mouse is not on one of the forms because of
a form it was on was destroyed). In the next release, fl_winget()
will return 0 when there is no appropriate window to return and
will never return a bad window. spl's suggestion of keying the window
ID of an object/form is a sound one.
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