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a717b85e2e
A new widget which handles parameter values for child algorithms within a model. Instead of the previous approach of requiring individual widget wrappers to handle creation of a suitable model widget, we do all this automatically for them. This widget uses a stacked widget with a toolbutton to select the parameter's source, instead of the previous combo box approach (which didn't scale well for large models). I.e. users select first whether the value is taken from a static value, a model input, or an output from a different child algorithm. The widget then changes appearance and behavior based on this choice. Additionally, a new option is present for all parameters of using a "precalculated expression". This expression is evaluated once before the child algorithm is executed and used during the execution of that algorithm.