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Reference issue (if any)

Fixes #13229.

What does this implement/fix?

Fix add_reference_channels() for calling it with two (ore more) channel names.

Also add a test to ensure that added channels do not share the same loc object, which was the cause of the bug.

Additional information

None.

@larsoner larsoner merged commit 3d7722f into mne-tools:main Oct 28, 2025
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Thanks @mistraube !

@mistraube mistraube deleted the refchan branch October 28, 2025 20:15
larsoner added a commit to BeiGeJin/mne-python that referenced this pull request Nov 5, 2025
* upstream/main: (230 commits)
  FIX: Fix ICA.apply when fitted including marked bad channels (mne-tools#13478)
  FIX: Correctly set the calibration factor in Nihon Kohden reader (mne-tools#13468)
  [pre-commit.ci] pre-commit autoupdate (mne-tools#13479)
  MAINT: Update code credit (mne-tools#13477)
  Fix `versionadded` directive formatting (mne-tools#13471)
  typo in mailmap (mne-tools#13475)
  FIX: Fix _plot_topomap channel names plotting when using a mask (mne-tools#13470)
  FIX: Handle an Eyelink File with blank lines injected throughout file (mne-tools#13469)
  ENH: adds annotation filtering to raw and ica source figures (mne-tools#13460)
  MAINT: Restore VTK nightly wheel on Linux and bump changelog checker (mne-tools#13436)
  [pre-commit.ci] pre-commit autoupdate (mne-tools#13465)
  FIX: Fix add_reference_channels for passing two channels names (mne-tools#13466)
  ENH: Add on_missing for combine_channels (mne-tools#13463)
  Bump the actions group with 2 updates (mne-tools#13464)
  Move development dependencies into a dependency group (no more extra) (mne-tools#13452)
  ENH: add on_missing for rename_channels (mne-tools#13456)
  add advisory board to website (mne-tools#13462)
  ENH: Support Nihon Kohden EEG-1200A V01.00 (mne-tools#13448)
  MAINT: Update dependency specifiers (mne-tools#13459)
  ENH: Add encoding parameter to Nihon Kohden reader (mne-tools#13458)
  ...
larsoner added a commit to szz-dvl/mne-python that referenced this pull request Nov 5, 2025
* upstream/main: (85 commits)
  FIX: Fix ICA.apply when fitted including marked bad channels (mne-tools#13478)
  FIX: Correctly set the calibration factor in Nihon Kohden reader (mne-tools#13468)
  [pre-commit.ci] pre-commit autoupdate (mne-tools#13479)
  MAINT: Update code credit (mne-tools#13477)
  Fix `versionadded` directive formatting (mne-tools#13471)
  typo in mailmap (mne-tools#13475)
  FIX: Fix _plot_topomap channel names plotting when using a mask (mne-tools#13470)
  FIX: Handle an Eyelink File with blank lines injected throughout file (mne-tools#13469)
  ENH: adds annotation filtering to raw and ica source figures (mne-tools#13460)
  MAINT: Restore VTK nightly wheel on Linux and bump changelog checker (mne-tools#13436)
  [pre-commit.ci] pre-commit autoupdate (mne-tools#13465)
  FIX: Fix add_reference_channels for passing two channels names (mne-tools#13466)
  ENH: Add on_missing for combine_channels (mne-tools#13463)
  Bump the actions group with 2 updates (mne-tools#13464)
  Move development dependencies into a dependency group (no more extra) (mne-tools#13452)
  ENH: add on_missing for rename_channels (mne-tools#13456)
  add advisory board to website (mne-tools#13462)
  ENH: Support Nihon Kohden EEG-1200A V01.00 (mne-tools#13448)
  MAINT: Update dependency specifiers (mne-tools#13459)
  ENH: Add encoding parameter to Nihon Kohden reader (mne-tools#13458)
  ...
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When passing two channel names to add_reference_channels(), their location is incorrect

2 participants