How to re-attach this piece?

I popped the door panel off my 68 Dart to have my door lock cylinder re-coded. In doing so, I noticed this piece disconnected from front window channel, where it's supposed to attach. I'm assuming it's some sort of support bracket.

Since I never even noticed it, I'm not convinced it's 100% necessary. But, is there any way to fix this and re-attach the bracket without completely disassembling the inner workings of the door and taking the window out? It looks as though it's supposed to be spot welded.

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