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vbo/dlist: add vertices to incomplete primitives

Pierre-Eric Pelloux-Prayer requested to merge pepp/mesa:backport_dcbf2423_21_3 into staging/21.3

If a primitive is added with missing vertices, this will shift all the vertices and produce incorrect rendering.

In issue #5786 (closed) the app uses GL_LINE_STRIPS with a single vertex.

Adding extra vertices can make the initial estimation for the index buffer size incorrect, so this buffer can now be growed if needed.

Fixes: ac3d4c76 ("vbo/dlist: convert LINE_STRIPS to LINES") Closes: #5786 (closed) Acked-by: Marek Olšák marek.olsak@amd.com Part-of: !14243 (merged)

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