Commits on Nov 20, 2020

1. keyboard: use SmallVec for the Enter event's currently pressed keys …

   The Event enum used string slices referencing stack-allocated Vecs (that were not reused anywhere else).
   The lifetime makes it awkward for consumers (no way to e.g. store the Event somewhere) but I doubt
   that it was a useful optimization (even if the optimizer can't allocate the Vec directly in the resulting enum,
   creating a slice of it is hardly better than moving it: you still write the address and size, just not the capacity).
   
   However, we can use SmallVec (already a dependency of wayland-rs) for an actual optimization:
   this will avoid allocating Vec contents if 1-2 keys are held when the surface gets keyboard focus.

   

   valpackett committed Nov 20, 2020
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