When I try to use the Filter widget on my table, the Group stops collapsing.
I made 2 test tables. The "Group" is under SERVIDOR
http://stats.wotpt.tk/WOTPT_Filter_Off.php
with widgets : ['group', 'zebra', 'math', 'cssStickyHeaders'],
http://stats.wotpt.tk/WOTPT_Filter_On.php
with widgets : ['group', 'filter', 'zebra', 'math', 'cssStickyHeaders'],
This is the only difference between the tables.
On WOTPT_Filter_Off.php the Groups collapses, but they are not visible on page load. The table needs to be reordered to display the Groups.
On WOTPT_Filter_Off.php the Groups are shown at page load but they do not collapse.
I'm using: Tablesorter by Rob Garrison (Mottie) 2.20.1 and Jquery 1.11.2.
That problem turned out to be a bug in the filter widget. It was adding a "display:table-row" to every visible row so the "group-hidden" class was not able to hide the collapsed group.
I've fixed this problem in the latest version (v2.21.0) - The grouping widget demo now includes a filter row for testing ;P
Thanks for reporting this issue!