From: David Briscoe <idbrii@gmail.com>
Date: Fri, 7 Dec 2018 00:45:35 +0000 (-0800)
Subject: Prevent repeated sourcing of syntax
X-Git-Url: https://git.madduck.net/etc/vim.git/commitdiff_plain/da145debf80da5f38e244d2f968d43f5051590f1?hp=da145debf80da5f38e244d2f968d43f5051590f1

Prevent repeated sourcing of syntax

Bug: Using `vim --startuptime ~/time.log name.md` would show multiple
sourcing of syntax/markdown.vim indicating unnecessary startup cost.

Cause: As of vim/vim@7d76c804af900ba6dcc4b1e45373ccab3418c6b2, vim uses
.md for markdown instead of modula2. Since vim-markdown was using `set
filetype`, it was sourcing the files a second time after vim's runtime
files had already set the filetype.

Resolution: Using `setfiletype` prevents this double sourcing. To remain
backwards compatible, we remove the .md filetype detection for modula2
on old versions.

Related to sheerun/vim-polyglot#290.

Tested .md ftdetection with vim 7.4.052 and 8.1.527.
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