Containing Group/Sub-Group relationships (#5105)

* Add UI support for setting containing groups
* Show containing groups in group details panel
* Move tag hierarchical filter code into separate type
* Add depth to scene_count and add sub_group_count
* Add sub-groups tab to groups page
* Add containing groups to edit groups dialog
* Show containing group description in sub-group view
* Show group scene number in group scenes view
* Add ability to drag move grid cards
* Add sub group order option
* Add reorder sub-groups interface
* Separate page size selector component
* Add interfaces to add and remove sub-groups to a group
* Separate MultiSet components
* Allow setting description while setting containing groups

pkg/group/reorder.go

@@ -0,0 +1,33 @@
+package group
+
+import (
+	"context"
+	"errors"
+
+	"github.com/stashapp/stash/pkg/models"
+)
+
+var ErrInvalidInsertIndex = errors.New("invalid insert index")
+
+func (s *Service) ReorderSubGroups(ctx context.Context, groupID int, subGroupIDs []int, insertPointID int, insertAfter bool) error {
+	// get the group
+	existing, err := s.Repository.Find(ctx, groupID)
+	if err != nil {
+		return err
+	}
+
+	// ensure it exists
+	if existing == nil {
+		return models.ErrNotFound
+	}
+
+	// TODO - ensure the subgroups exist in the group
+
+	// ensure the insert index is valid
+	if insertPointID < 0 {
+		return ErrInvalidInsertIndex
+	}
+
+	// reorder the subgroups
+	return s.Repository.ReorderSubGroups(ctx, groupID, subGroupIDs, insertPointID, insertAfter)
+}