grc-qt: Variable editor: fix several bugs #7357
Merged
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Description
The Variable editor in grc-qt is an incomplete port of the Variable editor in grc --gtk
But as all the functionsof the editor like add/delete/enable/disable block are already coded int the Mainwindow it's sufficient to map this functions from the editor by signal and slot mechanism to the correspondend functions in the Mainwindow.
Related Issue
Fixes #7305
Fixes #7306
Fixes #7307
Testing Done
Setup several fg's and edit the variables within the variable editor
Checklist