navigation: Decide what to do about custom/mod GstNavigationModifierTypes
The following discussion from !2931 (merged) should be addressed:
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@slomo started a discussion: (+11 comments) I have no idea if the X11 and GStreamer flags match at all except for the unknown ones (I get
1<<4
from X11, no idea what that is) but I assume you checked that @thiblahute ?