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The Apply Image dialog sends Channels-panel names in sourceChannel ("RGB" by
default, "Red", "Alpha 1"), but the export matched only lowercase keys, so a
dialog-recorded Apply Image failed strict .atn export. Channel names now map
case-insensitively (RGB/CMYK/Lab to the composite), an alpha channel is written
as a Chnl name reference and read back on import, and a numeric layer or channel
selector is refused instead of becoming the merged composite.
Tests: apply_image_dialog_channel_names_survive_a_strict_export (the dialog's
exact params) and apply_image_numeric_source_selectors_are_refused; both fail
without the fix.
Co-authored-by: VishnuByrraju <112673081+VishnuByrraju@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>