patch 8.2.0578: heredoc for interfaces does not support "trim" Commit: https://github.com/vim/vim/commit/6c2b7b8055b96463f78abb70f58c4c6d6d4b9d55 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Apr 14 20:15:49 2020 +0200 patch 8.2.0578: heredoc for interfaces does not support "trim" Problem: Heredoc for interfaces does not support "trim". Solution: Update the script heredoc support to be same as the :let command. (Yegappan Lakshmanan, closes #5916)

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