HGrid.Col.Name.showExpander() not refreshing in all situations

[brianjgeiger]

There are a few issues in https://github.com/CenterForOpenScience/openscienceframework.org/issues/726 that seem to be because I have a showExpander function that returns the correct value but the view isn't being updated all the time.

The specific items from the original are: There are a number of cases when one would expect the ± button to be hidden when it is shown and vice-versa. Here's what I've found:

• A project dragged from "All my projects" into a folder that previous had no children will not cause the ± button to appear, although it should. This occurs in any case that doesn't cause the parent folder to refresh.
• The final project being deleted from a folder will not cause the ± button to disappear on that folder, although it should.
• In some cases with an unknown cause, a folder will continue to have a ± regardless of what happens to it. This may be related to the smart-folder issue.

This may not have been the original cause in all cases, but I am maintaining a separate "childrenCount" now (so we know whether to show the disclosure control for a folder that isn't already lazy-loaded), and I'm updating it under circumstances when the HGrid wouldn't necessarily know that things have changed.

The only way I can force things to work is to reload the folder above the folder with the control that isn't updating.

[brianjgeiger]

This is fixed in the Project Organizer, but HGrid should be able to track unloaded children counts on loaded nodes and show the expand controls as appropriate. Presuming the back-end gave a children count to the HGrid, of course.