public interface ValueControlledNode
Nodes implementing this interface and whose dialog component implements
have an additional method called when the dialog is opened. This allows them to display the currently used value
in the configuration dialog. E.g. a string quickform input has a default value of "foo" but the value as per
subnode configuration dialog is "bar" -- this will then be shown in the main config dialog of the QF node to
clarify why the current output is "bar" although it says "foo" in the dialog.
void saveCurrentValue(NodeSettingsWO content)
content- To save to, not null.
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