patch 8.2.0816: terminal test fails when compiled with Athena Commit: https://github.com/vim/vim/commit/87202264f8e27f084c0e58f98aeb27fa5c6d5251 Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 24 17:23:45 2020 +0200 patch 8.2.0816: terminal test fails when compiled with Athena Problem: Terminal test fails when compiled with Athena. Solution: Do give an error when the GUI is not running. (hint by Dominique Pelle, closes #5928, closes #6132)

|f+0&#ffffff0|o@1| |4| @64
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|f|o@1| |1|0| @63
|b+9&&|a|r| +8&&|1@1| @63
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