Enhancement request for Grid.set columns using the JsonRest store

[lixopmstp]

Would it be possible to have a flag or something so that setting columns would not trigger a data request? Here's my use case: I have a Edit Mode button which when users click it puts editors on certain columns. What happens is when I call set columns the grid initiates a refresh and makes a request to the backend server for data. If the server has to run a slow query (or one that returns a lot of data) there is a noticeable delay, plus the grid data rows are blanked/deleted. I my scenario the data does not change, just the widgets used to display/interact with it. BTW, I do understand that in the more general case it makes sense to refresh the data and the UI.

[kfranqueiro]

This sounds like a duplicate of #384, so I'm closing this one.

Accommodating this may require some refactoring in order to make dgrid reuse data that was previously obtained.

In the interim, perhaps dstore/Cache could help in these cases (with dgrid 0.4).