xStream: renaming userdata/callback can throw error

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Scripting tools written by the Renoise team

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xStream: renaming userdata/callback can throw error #108

Closed bjorn-nesby closed 7 years ago

bjorn-nesby commented 7 years ago

Create some userdata, then rename the callback - throws this error (must have been overlooked during refactoring):

.\source/xStreamUILuaEditor.lua:179: attempt to call method 'rename_callback' (a nil value) stack traceback: *** .\source/xStreamUILuaEditor.lua:179: in function <.\source/xStreamUILuaEditor.lua:178>