Gedit
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Description
gedit is the official text editor of the GNOME desktop environment. By default it is already equipped with a syntax highlighter for NSIS. If you need to install manually, follow the steps below.
Installation
1. Download nsis.lang
2. Move the file to ~/.local/share/gtksourceview-3.0/language-specs
Note: replace 3 with 2 in the path for GtkSourceView version 2.