[BUGFIX] Explicitly set variables should override local variables #849
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The default behavior of the newly introduced local and global variable scopes has been that existing local variables are preferred over global variables if both exist. While this makes sense in general, if a local variable gets overwritten by a VariableViewHelper, this value couldn't be used in the local context because the local variable still had its old value.
This change makes sure that both the local and the global variable get the new value. This eliminates the described inconsistencies when using a name of a local variable for a global variable.
Resolves #846