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openfoam: problem with broadcast sync (fixes #18505)

olesen requested to merge olesen/vtk:openfoam-broadcast-error into master

  • errors on the root processes would broadcast and return, except there was no corresponding broadcast on the other processes (ie, it would block).

  • reworked logic to simplify the handling.

  • misc code cleanup for broadcasts (code style only).

  • replace memmove with memcpy for broadcasting vtkStringArray contents (guaranteed to be non-overlapping)

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