When attempting to `copyArtifacts` using S3 manager, only the first matching glob in a list is copied when the filter contains whitespace after comma.

Example:

copyArtifacts(
  filter: '**/*file*.bin, **/*log*.bin, **/*data*.bin, **/*record*.bin',
  fingerprintArtifacts: true,
  flatten: true,
  projectName: 'artifact-producer',
  selector: lastSuccessful()
)

Removing the "optional whitespace" as documented in https://github.com/jenkinsci/copyartifact-plugin/blob/770.va_6c69e063442/src/main/resources/hudson/plugins/copyartifact/CopyArtifact/help-filter.html correctly downloads all matching artifacts.

This behavior was only seen when the S3 artifact manager was enabled and is not observed with the built-in artifact management.

Workaround:
It's simple enough to remove the whitespace either by modifying Jenksfiles or using a shared-library to wrap `copyArtifacts`, but in our case we have a substantial number of Jenkinsfiles that would have to be changed to workaround.