GIMP Script-fu

sg-merge-linked
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Command:
Merge linked
Menu:
"<Image>/Image/Merge linked"
PDB Name:
script-fu-sg-merge-linked
Download:
sg-merge-linked.scm (after the page appears, click on the "Download" command)
License:
GPLv2+

Description:

Merges all linked layers. Hidden layers that are linked will be included in the merge.