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In the dev builds there doesn't appear to be a way to see the cvs command line that's going to be executed before executing the command from the gui (e.g. cvs update -dAP). I found this to be a useful feature of the old built in cvs client just as a sanity check when using the cvs gui.
Scheduling to promotion-D. A generic framework for that needs to be made in VariableInputDialog class in vcscore module.