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/usr/share/themes/Adwaita/gtk-2.0/apps.rc is in gnome-themes-extra-data 3.28-1ubuntu1.

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# vim:set ft=gtkrc ts=2 sw=2 sts=2 ai et:
#
# This file, unlike hacks.rc, contains legitimate cases we need to handle, e.g.
# custom widgets, programs giving us a chance to alter their UI to fit more with
# the theme or stuff that is supposed to look different, like panels.

# TODO: This could really look nicer
style "gimp_spin_scale" {

  # Spin background
  bg[NORMAL] = @base_color

  engine "pixmap" {

    image {
      function        = BOX
      state           = NORMAL
      detail          = "spinbutton_up"
      overlay_file    = "assets/spin-up.png"
      overlay_stretch = FALSE
    }

    image {
      function        = BOX
      state           = PRELIGHT
      detail          = "spinbutton_up"
      overlay_file    = "assets/spin-up.png"
      overlay_stretch = FALSE
    }

    image {
      function        = BOX
      state           = ACTIVE
      detail          = "spinbutton_up"
      overlay_file    = "assets/spin-up.png"
      overlay_stretch = FALSE
    }

    image {
      function        = BOX
      state           = INSENSITIVE
      detail          = "spinbutton_up"
      overlay_file    = "assets/spin-up-insensitive.png"
      overlay_stretch = FALSE
    }

    image {
      function        = BOX
      state           = NORMAL
      detail          = "spinbutton_down"
      overlay_file    = "assets/spin-down.png"
      overlay_stretch = FALSE
    }

    image {
      function        = BOX
      state           = PRELIGHT
      detail          = "spinbutton_down"
      overlay_file    = "assets/spin-down.png"
      overlay_stretch = FALSE
    }

    image {
      function        = BOX
      state           = ACTIVE
      detail          = "spinbutton_down"
      overlay_file    = "assets/spin-down.png"
      overlay_stretch = FALSE
    }

    image {
      function        = BOX
      state           = INSENSITIVE
      detail          = "spinbutton_down"
      overlay_file    = "assets/spin-down-insensitive.png"
      overlay_stretch = FALSE
    }

 }

}

style "chrome_gtk_frame" {

  ChromeGtkFrame::frame-color          = @window_color
  ChromeGtkFrame::frame-gradient-color = @window_color
  ChromeGtkFrame::inactive-frame-color = @bg_color

  ChromeGtkFrame::incognito-frame-color          = "#cbd2d9"
  ChromeGtkFrame::incognito-frame-gradient-color = "#cbd2d9"
  ChromeGtkFrame::incognito-inactive-frame-color = mix (0.5, @bg_color, "#cbd2d9")

}

# Disable spin button assets for GimpSpinScale
class "GimpSpinScale" style "gimp_spin_scale"

# Chromium lets us define some colours and settings for better integration
class "ChromeGtkFrame" style "chrome_gtk_frame"