Cross-file copy of LU / LG resources

[yeze322]

Describe the bug

If a user copies a SendActivity action to another dialog file, the LG content inside that action won't be copied along with the action.

We should also cover the copy behavior of LU resources.

Version

Browser

• Chrome
• Safari
• Firefox
• Edge

OS

• macOS
• Windows
• Ubuntu

To Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

Screenshots

Additional context

Follows #2199

[hibrenda]

As discussed with Ze and Dong, we plan to support shallow copy for LG & LU . we may need further discussion on how to handle the custom template editing. eg. only common.lg could be toggled into edit mode. so that all the referenced templates could only be defined in common.lg.
for other lg file, user can only get the list view in all up and could do inline editing in list view. This will solve the shallow copy for nested template reference. @cwhitten @sangwoohaan

[cwhitten]

addressed via #2236

[yeze322]

As discussed with Ze and Dong, we plan to support shallow copy for LG & LU . we may need further discussion on how to handle the custom template editing. eg. only common.lg could be toggled into edit mode. so that all the referenced templates could only be defined in common.lg.
for other lg file, user can only get the list view in all up and could do inline editing in list view. This will solve the shallow copy for nested template reference. @cwhitten @sangwoohaan

Yes, I and Zhixiang came up with a same conclusion that a dialog's correlated lg file shouldn't contain any self-referenced templates. As you said, all the referenced templates should only be defined in common.lg.

The new copy-paste behavior of LG templates in Visual Editor is right based on this policy. I think @zhixzhan can follow up the LGEditor / all-up-view part.