Themes: Add a Materia Gruvbox theme

.local/share/themes/Materia-Gruvbox/gtk-2.0/gtkrc

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+# Based on Bridge by ScionicSpectre and Adwaita by GNOME
+# vim:set ts=2 sw=2 sts=2 ai et:
+#
+# This is the GTK 2 version of oomox-Dark. It's whole purpose is to look as the
+# GTK 3 version as much as possible until GTK 2 dies completely.
+#
+# Note: comments for explaining styles are on the bottom of each file beside the
+# widget matches.
+
+# Declare the colours used throughout the theme.
+# There shouldn't be any fiddling with them in the theme files themselves in
+# order to not mess up the dark theme.
+
+# Text/base
+gtk-color-scheme = "base_color:#282828"
+gtk-color-scheme = "text_color:#ebdbb2"
+# Foreground/background
+gtk-color-scheme = "bg_color:#282828"
+gtk-color-scheme = "fg_color:#ebdbb2"
+# Selected foreground/background
+gtk-color-scheme = "selected_bg_color:#83a598"
+gtk-color-scheme = "selected_fg_color:#212121"
+# Titlebar foreground/background
+gtk-color-scheme = "titlebar_bg_color:#32302f"
+gtk-color-scheme = "titlebar_fg_color:#ebdbb2"
+# Menus
+gtk-color-scheme = "menu_color:#282828"
+# Tooltips foreground/background
+gtk-color-scheme = "tooltip_bg_color:#616161"
+gtk-color-scheme = "tooltip_fg_color:#ebdbb2"
+# Links
+gtk-color-scheme = "link_color:#83a598"
+gtk-color-scheme = "visited_link_color:#ce93d8"
+
+# Set GTK settings
+gtk-auto-mnemonics              = 1
+gtk-primary-button-warps-slider = 1
+
+# And hand over the control to the theme files
+include "main.rc"
+include "apps.rc"
+include "hacks.rc"