Work without activating window

[gin]

Doing the shift+mouse rectangle method gives me this

Error (RT) in <open ":1541: /779">Macro2: this variable not initialized. <help #IDP_ERR>?

Also, the code doesn't have a.move. It has a.mouse.

Is that a problem?

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I tried the manual method by setrect and I get the same variable not initialized error

Error (RT) in <open ":1607: /991">Macro2: this variable not initialized. <help #IDP_ERR>?

The onscreen rectangle is in the right place though.