b084036c87
VST used the count of available of presets as URI: - add 2 presets (1,2) - remove first, add another one -> two presets with same URI (2,2) PluginInfo::get_presets() simply lists all (name only) in a vector. Plugin::find_presets() uses the URI in a map (unique by URI). ..various ensuing bugs: eg. Plugin::remove_preset() looked up by name, but didn't check for NULL.
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