bdd6eec95c
Previously the group-tab extended all the way down to the last track. Potentially with a widget height of > 2^15 px. This caused issues with gtk widgets (notably on Windows) ``` unhandled exception (type std::exception) in signal handler: what: invalid value (typically too big) for the size of the input (surface, pattern, etc.) ``` This also prepares for Mixer Tab-Group to use the same separation between visible and total extent.
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