edge-sobel: add doc-description to keep_signal property

parent b2e511e1
......@@ -29,6 +29,7 @@ property_boolean (horizontal, _("Horizontal"), TRUE)
property_boolean (vertical, _("Vertical"), TRUE)
property_boolean (keep_signal, _("Keep Signal"), TRUE)
description ("Keep negative values in result, when off the absolute value of the result is used instead.")
#else
......
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