Regression from rB12c71508c2d7.
Now, we systematically first try keycode from `XLookupKeysym()`, and only fall back to
the one from `XLookupString()` if it failed to convert to a valid gkey.
The issue was caused by fix for 31017 which resulted in some
missing intersecitons recorded which screwed inner/outer checks.
This is an old bug, so didn't bother with forcing re-distribution
to happen on file open to avoid possible other regressions.
The issue was introduced by a fix for T44713 which only made GLSL
consistent with Cycles.
Now we do have conditional averaging or proper luma weighting based
on whether we're new old old shading system. Not totally ideal but
should work for until we re-design viewport possibly breaking how
Blender Internal does implicit conversion.
Original change in d631252 was not quite correct because it
was missing release since the acquire() will return NULL.
Hopefully now all the cases are covered.
Such configuration used to cause quite confusing situation when
stamp will use actual scene's statistics but metadata from strip
will be used for the saved file (basically, causing different
information stamped and saved as metadata).
Don't think it was desired behavior and it's something what
artists here in the studio wants to be fixed.
This way it's possible to have some color-correction modifications on
top of the render result and yet still have proper metadata stored.
Usecase: Access per-frame render-time of the movie frames from the
final export.
In some cases transform modes would use the custom-data pointer,
other times the transform conversion functions would.
However with some combinations (bone mirror + bend for eg),
both conversion & transform mode would use this pointer causing a crash.
Fix this by having 2 custom-data pointers:
one for the mode, another for the data-type.
This also simplifies time-slide which was conditionally mixing mode/type data in the one array.
Those two were the only one rotating around some world axis (turntable mode),
so better make their behavior consistent with other rotating numpad keys.
This breaks the turntable-rotation with numpad keys, though.
That was the main issue (in both T46455 and T46690), solved by 'flattening' those chains (v1 -> v2 ->v3 etc.)
before calling `CDDM_merge_verts()`.
Also added note to `CDDM_merge_verts()` that it does not support chained mapping, along with
a basic assert that should catch most of those cases in future.
The logic of 'following mapping' was also rather broken, making a special case here when using
object-controlled offset is very weak. Further more, blindly following mapping in this case
was far from ideal, this could end to merging vertices rather far from each other.
To address this issue, we now always follow mapping, but only as long as 'final' vertex remains
close enough from mapped one.
Finally, the search of 'closest' vertex to merge with was also quite bad, would just pick the first
one matching distance limit, instead of using the actual closest one - could lead to rather ugly
geometry deformations in case one would use not-so-small merge threashold!
