[FIX]Fixed the issue of kanban group column's subtitle disappear when record is dragged from one group to another one, also set special context for read_group, current read_group return full group_by, if read_group return all groups then fix of kanban drag and aggregate update will be fruitless, passed specail key no_group_by_full in special scenario while recomputing aggregate for particular kanban column, current fix of kanban record drag and aggregate value reload is done based on calling read_group with domain=[group_by, =, group_value] i.e. domain of group(instance.web.QueryGroup) but due to group_by_full applied on model it returns full group_by, it also returns group which doens't have any record, hence it makes previous fix fruitless, created a controller to get result of read_group for both columns in one go as per suggestion.
[FIX]Fixed the issue for new column which does not having real group, skip such columns and hide its subtitles