WXGUI attribute query might lead to accidental attribute data editing

[marisn]

Vector data attribute querying by default uses editing mode. This might lead to unintended data change (i.e. pressing cut instead of copy when copying value).

UI is also not helpful - what does "Submit" means in the context of querying attributes? And what is "Cancel"? Where's the "Close" button?

Enter key is also binded to "Submit" action.

It might make sense for editing session, still in a plain object attribute querying context it's dangerously confusing.