Filtering segment properties with negative numerical properties does not work

[ceesem]

Negative numerical properties display correctly in terms of the CDF and the individual object info displayed in the "Selection" widget. Filters with positive numbers work correctly, updating both the graph and the list of segment IDs. However, if a filter with a negative number is used (e.g. my_prop<=-1.0), all segment IDs are filtered out regardless of the value they were assigned.