[SDPhantom]

It's a series of function calls, but ultimately, it's handled by ChatEdit_InsertLink().


Here's what the call stack should look like:

• ContainerFrameItemButton_OnModifiedClick() - FrameXML/ContainerFrame.lua:1010
• HandleModifiedItemClick() - FrameXML/ItemButtonTemplate.lua:113
• ChatEdit_InsertLink() - FrameXML/ChatFrame.lua:3808

(Note: All except the last reference the line number for the next call.
The last is the function definition itself.)