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Problem: If $NVIM_APPNAME is a relative dir path, Nvim fails to start its primary/default server, and `v:servername` is empty. Root cause isd34c64e342, but this wasn't noticed until96128a5076started reporting the error more loudly. Solution: - `server_address_new`: replace slashes "/" in the appname before using it as a servername. - `vim_mktempdir`: always prefer the system-wide top-level "nvim.user/" directory. That isn't intended to be specific to NVIM_APPNAME; rather, each *subdirectory* ("nvim.user/xxx") is owned by each Nvim instance. Nvim "apps" can be identified by the server socket(s) stored in those per-Nvim subdirs. fix #30256