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This fixes an issue (#12573) where colorscheme files are sourced twice upon startup. This occurs when the startup script calls `:colorscheme`, which sets the `g:colors_name` global variable. When syntax highlighting is enabled in `syn_maybe_enable()` the `syntax.vim` script is sourced which in turn sources `synload.vim`. This script checks to see if `g:colors_name` is set and, if so, runs exe "colors " . colors_name This is done to ensure that highlight groups are defined before enabling the syntax highlighting engine. Instead, source syncolors.vim before the startup scripts which sets up default highlights and only load the full syntax engine after the startup scripts or when the user runs `:syntax on`. Add a guard variable `did_syncolor` to prevent syncolor.vim from being sourced twice and remove the line mentioned above from synload.vim so that the colorscheme file is not re-sourced when the syntax engine is loaded.
This directory contains Vim scripts for syntax highlighting. These scripts are not for a language, but are used by Vim itself: syntax.vim Used for the ":syntax on" command. Uses synload.vim. manual.vim Used for the ":syntax manual" command. Uses synload.vim. synload.vim Contains autocommands to load a language file when a certain file name (extension) is used. And sets up the Syntax menu for the GUI. nosyntax.vim Used for the ":syntax off" command. Undo the loading of synload.vim. A few special files: 2html.vim Converts any highlighted file to HTML (GUI only). colortest.vim Check for color names and actual color on screen. hitest.vim View the current highlight settings. whitespace.vim View Tabs and Spaces. If you want to write a syntax file, read the docs at ":help usr_44.txt". If you make a new syntax file which would be useful for others, please send it to Bram@vim.org. Include instructions for detecting the file type for this language, by file name extension or by checking a few lines in the file. And please write the file in a portable way, see ":help 44.12". If you have remarks about an existing file, send them to the maintainer of that file. Only when you get no response send a message to Bram@vim.org. If you are the maintainer of a syntax file and make improvements, send the new version to Bram@vim.org. For further info see ":help syntax" in Vim.