find_snap_point_y() function
Search for snap point in the min..max range.
Arguments
obj
the object on which snap point should be found
min
ignore snap points smaller than this. (Absolute coordinate)
max
ignore snap points greater than this. (Absolute coordinate)
ofs
offset to snap points. Useful to get a snap point in an imagined case what if children are already moved by this value
Return value
the absolute y coordinate of the nearest snap point or `LV_COORD_MAX` if there is no snap point in the min..max range