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Ell authored
GUM is a small language for controlling some UI attributes of operation properties dynamically, based on context. It is currently used by GIMP, as of commit bb2417c29943e68baecd87f6c8c7808ebc3d091e. See the comment at the top of app/widget/gimppropgui-eval.c, in the GIMP tree, for a description of the language. This commit adds ui_meta keys containing GUM expression for a bunch of ops, to make their UI more context aware. The list of ops is not necessarily exhaustive -- there may be more ops that can be GUMified. Note that the new ui_meta keys augment, rather than replace, the existing static attributes of properties (in particular, their label and description), so that they still retain a meaningful value for users that don't support GUM.
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