diff --git a/lib/awful/layout/init.lua b/lib/awful/layout/init.lua
index 1718bcb80..e4af211b6 100644
--- a/lib/awful/layout/init.lua
+++ b/lib/awful/layout/init.lua
@@ -138,11 +138,11 @@ function layout.parameters(t, screen)
 
     local clients           = client.tiled(screen)
     local gap_single_client = true
-    
+
     if(t and t.gap_single_client ~= nil) then
         gap_single_client = t.gap_single_client
     end
-    
+
     local min_clients       = gap_single_client and 1 or 2
     local useless_gap       = t and (#clients >= min_clients and t.gap or 0) or 0
 
diff --git a/lib/awful/placement.lua b/lib/awful/placement.lua
index e56ff7512..7957ddf17 100644
--- a/lib/awful/placement.lua
+++ b/lib/awful/placement.lua
@@ -8,7 +8,7 @@
 --   [visitor objects](https://en.wikipedia.org/wiki/Visitor_pattern)
 -- * Turn each function into an API with various common customization parameters.
 -- * Re-use the same functions for the `mouse`, `client`s, `screen`s and `wibox`es
--- 
+--
 --
 -- <h3>Compositing</h3>
 --
diff --git a/lib/awful/tag.lua b/lib/awful/tag.lua
index 36f9c9704..7bd9bd17c 100644
--- a/lib/awful/tag.lua
+++ b/lib/awful/tag.lua
@@ -985,7 +985,7 @@ function tag.object.get_master_count(t)
         or defaults.master_count
 end
 
---- 
+---
 -- @deprecated awful.tag.setnmaster
 -- @see master_count
 -- @param nmaster The number of master windows.
diff --git a/lib/awful/titlebar.lua b/lib/awful/titlebar.lua
index c9e6f4e5b..c055349e2 100644
--- a/lib/awful/titlebar.lua
+++ b/lib/awful/titlebar.lua
@@ -249,8 +249,8 @@ end
 --- Get a client's titlebar
 -- @class function
 -- @tparam client c The client for which a titlebar is wanted.
--- @tparam[opt={}] table args A table with extra arguments for the titlebar. 
--- @tparam[opt=font.height*1.5] number args.size The height of the titlebar. 
+-- @tparam[opt={}] table args A table with extra arguments for the titlebar.
+-- @tparam[opt=font.height*1.5] number args.size The height of the titlebar.
 -- @tparam[opt=top] string args.position" values are `top`,
 -- `left`, `right` and `bottom`.
 -- @tparam[opt=top] string args.bg_normal
diff --git a/lib/awful/widget/watch.lua b/lib/awful/widget/watch.lua
index 112475df4..bc4c9af99 100644
--- a/lib/awful/widget/watch.lua
+++ b/lib/awful/widget/watch.lua
@@ -21,7 +21,7 @@
 --     222               end
 --     223             end),
 --     224             s.mylayoutbox,
--- 
+--
 -- ![Example screenshot](../images/awful_widget_watch.png)
 --
 -- @author Benjamin Petrenko
diff --git a/lib/gears/shape.lua b/lib/gears/shape.lua
index 08f580155..b89563c62 100644
--- a/lib/gears/shape.lua
+++ b/lib/gears/shape.lua
@@ -324,7 +324,7 @@ end
 -- @param cr A cairo context
 -- @tparam number width The shape width
 -- @tparam number height The shape height
--- @tparam number corner_radius 
+-- @tparam number corner_radius
 function module.octogon(cr, width, height, corner_radius)
     corner_radius = corner_radius or math.min(10, math.min(width, height)/4)
     local offset = math.sqrt( (corner_radius*corner_radius) / 2 )
diff --git a/tests/examples/awful/mouse/coords.lua b/tests/examples/awful/mouse/coords.lua
index b4b0ed957..4a40430ff 100644
--- a/tests/examples/awful/mouse/coords.lua
+++ b/tests/examples/awful/mouse/coords.lua
@@ -3,7 +3,7 @@ mouse.coords {x=175+60,y=60} --DOC_HIDE
 
  -- Get the position
 print(mouse.coords().x)
- 
+
  -- Change the position
 mouse.coords {
     x = 185,
diff --git a/tests/examples/awful/placement/closest_mouse.lua b/tests/examples/awful/placement/closest_mouse.lua
index 4269d1d8b..6d6941c15 100644
--- a/tests/examples/awful/placement/closest_mouse.lua
+++ b/tests/examples/awful/placement/closest_mouse.lua
@@ -52,7 +52,7 @@ mouse.coords {x=0,y=230} --DOC_HIDE
 awful.placement.closest_corner(mouse, {include_sides=true, parent=c}) --DOC_HIDE
 mouse.push_history() --DOC_HIDE
 assert(mouse.coords().x == c.x and mouse.coords().y == c.y+c.height+2*bw) --DOC_HIDE
- 
+
  -- It is possible to emulate the mouse API to get the closest corner of
  -- random area
 local _, corner = awful.placement.closest_corner(
diff --git a/tests/examples/awful/placement/compose2.lua b/tests/examples/awful/placement/compose2.lua
index 68cbf5b30..88d0c998c 100644
--- a/tests/examples/awful/placement/compose2.lua
+++ b/tests/examples/awful/placement/compose2.lua
@@ -1,15 +1,14 @@
 screen[1]._resize {x = 175, width = 128, height = 96} --DOC_NO_USAGE --DOC_HIDE
 local awful = {placement = require("awful.placement")} --DOC_HIDE
 local c = client.gen_fake {x = 220, y = 35, width=40, height=30} --DOC_HIDE
- 
 
     -- Simulate Windows 7 "edge snap" (also called aero snap) feature
     local axis = "vertically"
-    
+
     local f = awful.placement.scale
       + awful.placement.left
       + (axis and awful.placement["maximize_"..axis] or nil)
-    
+
     local geo = f(client.focus, {honor_workarea=true, to_percent = 0.5})
 
 local wa = screen[1].workarea--DOC_HIDE
diff --git a/tests/examples/gears/shape/arc.lua b/tests/examples/gears/shape/arc.lua
index 6fc696d4a..088fb8d15 100644
--- a/tests/examples/gears/shape/arc.lua
+++ b/tests/examples/gears/shape/arc.lua
@@ -1,10 +1,10 @@
 local shape,cr,show = ... --DOC_HIDE
- 
+
 shape.arc(cr,70,70, 10)
 show(cr) --DOC_HIDE
- 
+
 shape.arc(cr,70,70, 10, nil, nil, true, true)
 show(cr) --DOC_HIDE
- 
+
 shape.arc(cr,70,70, nil, 0, 2*math.pi)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/arrow.lua b/tests/examples/gears/shape/arrow.lua
index 37862fee5..981608da5 100644
--- a/tests/examples/gears/shape/arrow.lua
+++ b/tests/examples/gears/shape/arrow.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.arrow(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.arrow(cr,70,70, 30, 10, 60)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.arrow) : rotate_at(35,35,math.pi/2)(cr,70,70)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/circle.lua b/tests/examples/gears/shape/circle.lua
index 35814a009..0cb1b9fcd 100644
--- a/tests/examples/gears/shape/circle.lua
+++ b/tests/examples/gears/shape/circle.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.circle(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.circle(cr,20,70)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.circle) : scale(0.5, 1)(cr,70,70)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/cross.lua b/tests/examples/gears/shape/cross.lua
index b98d20d12..08c692e66 100644
--- a/tests/examples/gears/shape/cross.lua
+++ b/tests/examples/gears/shape/cross.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.cross(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.cross(cr,20,70)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.cross) : scale(0.5, 1)(cr,70,70)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/hexagon.lua b/tests/examples/gears/shape/hexagon.lua
index 110833411..d08beacb4 100644
--- a/tests/examples/gears/shape/hexagon.lua
+++ b/tests/examples/gears/shape/hexagon.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.hexagon(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.hexagon) : translate(0,15)(cr,70,20)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.hexagon) : rotate_at(35,35,math.pi/2)(cr,70,40)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/infobubble.lua b/tests/examples/gears/shape/infobubble.lua
index 9f0710234..c78ed8e0f 100644
--- a/tests/examples/gears/shape/infobubble.lua
+++ b/tests/examples/gears/shape/infobubble.lua
@@ -2,11 +2,11 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.infobubble(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.infobubble) : translate(0, 20)
    : rotate_at(35,35,math.pi) (cr,70,20,10, 5, 35 - 5)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.infobubble)
    : rotate_at(35,35,3*math.pi/2) (cr,70,70, nil, nil, 40)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/isosceles_triangle.lua b/tests/examples/gears/shape/isosceles_triangle.lua
index 933b52705..e20c5b8cf 100644
--- a/tests/examples/gears/shape/isosceles_triangle.lua
+++ b/tests/examples/gears/shape/isosceles_triangle.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.isosceles_triangle(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.isosceles_triangle(cr,20,70)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.isosceles_triangle) : rotate_at(35, 35, math.pi/2)(cr,70,70)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/losange.lua b/tests/examples/gears/shape/losange.lua
index 2205f8bb6..61b115c6a 100644
--- a/tests/examples/gears/shape/losange.lua
+++ b/tests/examples/gears/shape/losange.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.losange(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.losange(cr,20,70)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.losange) : scale(0.5, 1)(cr,70,70)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/octogon.lua b/tests/examples/gears/shape/octogon.lua
index 1c02da8e2..083cc7d89 100644
--- a/tests/examples/gears/shape/octogon.lua
+++ b/tests/examples/gears/shape/octogon.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.octogon(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.octogon(cr,70,70,70/2.5)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.octogon) : translate(0, 25) (cr,70,20)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/parallelogram.lua b/tests/examples/gears/shape/parallelogram.lua
index 6ae49ca54..1ba1c22fe 100644
--- a/tests/examples/gears/shape/parallelogram.lua
+++ b/tests/examples/gears/shape/parallelogram.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.parallelogram(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.parallelogram(cr,70,20)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.parallelogram) : scale(0.5, 1)(cr,70,70)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/partially_rounded_rect.lua b/tests/examples/gears/shape/partially_rounded_rect.lua
index cb8e87bea..18734a2aa 100644
--- a/tests/examples/gears/shape/partially_rounded_rect.lua
+++ b/tests/examples/gears/shape/partially_rounded_rect.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.partially_rounded_rect(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.partially_rounded_rect(cr, 70, 70, true)
 show(cr) --DOC_HIDE
- 
+
 shape.partially_rounded_rect(cr, 70, 70, true, true, false, true, 30)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/pie.lua b/tests/examples/gears/shape/pie.lua
index 60fafdd4d..60bead347 100644
--- a/tests/examples/gears/shape/pie.lua
+++ b/tests/examples/gears/shape/pie.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.pie(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.pie(cr,70,70, 1.0471975511966,   4.1887902047864)
 show(cr) --DOC_HIDE
- 
+
 shape.pie(cr,70,70, 0, 2*math.pi, 10)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/powerline.lua b/tests/examples/gears/shape/powerline.lua
index 37707a60e..dcaa9508d 100644
--- a/tests/examples/gears/shape/powerline.lua
+++ b/tests/examples/gears/shape/powerline.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.powerline(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.powerline) : translate(0, 25) (cr,70,20)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.powerline) : translate(0, 25) (cr,70,20, -20)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/radial_progress.lua b/tests/examples/gears/shape/radial_progress.lua
index ac9350e65..56ff74c26 100644
--- a/tests/examples/gears/shape/radial_progress.lua
+++ b/tests/examples/gears/shape/radial_progress.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.radial_progress(cr, 70, 20, .3)
 show(cr, true) --DOC_HIDE
- 
+
 shape.radial_progress(cr, 70, 20, .6)
 show(cr, true) --DOC_HIDE
- 
+
 shape.radial_progress(cr, 70, 20, .9)
 show(cr, true) --DOC_HIDE
diff --git a/tests/examples/gears/shape/rectangle.lua b/tests/examples/gears/shape/rectangle.lua
index 79c923968..92be78d24 100644
--- a/tests/examples/gears/shape/rectangle.lua
+++ b/tests/examples/gears/shape/rectangle.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.rectangle(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.rectangle(cr,20,70)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.rectangle) : scale(0.5, 1)(cr,70,70)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/rectangular_tag.lua b/tests/examples/gears/shape/rectangular_tag.lua
index ccc2684b8..b1444ffdd 100644
--- a/tests/examples/gears/shape/rectangular_tag.lua
+++ b/tests/examples/gears/shape/rectangular_tag.lua
@@ -5,9 +5,9 @@ show(cr) --DOC_HIDE
 
 -- shape.rectangular_tag(cr,20,70) --TODO broken --DOC_HIDE
 -- show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.rectangular_tag) : translate(0, 30) (cr, 70, 10,  10)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.rectangular_tag) : translate(0, 30) (cr, 70, 10, -10)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/rounded_bar.lua b/tests/examples/gears/shape/rounded_bar.lua
index 01894e1c2..6c874865d 100644
--- a/tests/examples/gears/shape/rounded_bar.lua
+++ b/tests/examples/gears/shape/rounded_bar.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.rounded_bar(cr, 70, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.rounded_bar(cr, 20, 70)
 show(cr) --DOC_HIDE
- 
+
 shape.rounded_bar(cr, 70, 20)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/gears/shape/rounded_rect.lua b/tests/examples/gears/shape/rounded_rect.lua
index 237650a1c..d8cfada8e 100644
--- a/tests/examples/gears/shape/rounded_rect.lua
+++ b/tests/examples/gears/shape/rounded_rect.lua
@@ -2,9 +2,9 @@ local shape,cr,show = ... --DOC_HIDE
 
 shape.rounded_rect(cr, 70, 70, 10)
 show(cr) --DOC_HIDE
- 
+
 shape.rounded_rect(cr,20,70, 5)
 show(cr) --DOC_HIDE
- 
+
 shape.transform(shape.rounded_rect) : translate(0,25) (cr,70,20, 5)
 show(cr) --DOC_HIDE
diff --git a/tests/examples/text/gears/object/properties.lua b/tests/examples/text/gears/object/properties.lua
index 0c80d8b32..6ea87bc06 100644
--- a/tests/examples/text/gears/object/properties.lua
+++ b/tests/examples/text/gears/object/properties.lua
@@ -4,12 +4,12 @@ local gears = require("gears") --DOC_HIDE
  -- methods and accessors. It is also possible to set them directly on the
  -- object.
 local class = {}
- 
+
 function class:get_foo()
     print("In get foo", self._foo or "bar")
     return self._foo or "bar"
 end
- 
+
 function class:set_foo(value)
     print("In set foo", value)
 
@@ -32,11 +32,11 @@ local o = gears.object {
 }
 
 print(o.foo)
- 
+
 o.foo = 42
- 
+
 print(o.foo)
- 
+
 o:method(1, 2, 3)
 
  -- Random properties can also be added, the signal will be emitted automatically.
@@ -46,7 +46,7 @@ o:connect_signal("property::something", function(obj, value)
 end)
 
 print(o.something)
- 
+
 o.something = "a cow"
- 
+
 print(o.something)
diff --git a/tests/examples/text/gears/object/signal.lua b/tests/examples/text/gears/object/signal.lua
index 090aa2143..ca83f1e16 100644
--- a/tests/examples/text/gears/object/signal.lua
+++ b/tests/examples/text/gears/object/signal.lua
@@ -1,24 +1,24 @@
 local gears = require("gears") --DOC_HIDE
 
 local o = gears.object{}
- 
+
  -- Function can be attached to signals
 local function slot(obj, a, b, c)
     print("In slot", obj, a, b, c)
 end
- 
+
 o:connect_signal("my_signal", slot)
- 
- -- Emit can be done without argument. In that case, the object will be 
+
+ -- Emitting can be done without arguments. In that case, the object will be
  -- implicitly added as an argument.
 o:emit_signal "my_signal"
- 
+
  -- It is also possible to add as many random arguments are required.
 o:emit_signal("my_signal", "foo", "bar", 42)
- 
+
  -- Finally, to allow the object to be garbage collected (the memory freed), it
  -- is necessary to disconnect the signal or use `weak_connect_signal`
 o:disconnect_signal("my_signal", slot)
- 
+
  -- This time, the `slot` wont be called as it is no longer connected.
 o:emit_signal "my_signal"
diff --git a/tests/examples/wibox/container/background/bg.lua b/tests/examples/wibox/container/background/bg.lua
index 9ef3e9595..4bfef12ac 100644
--- a/tests/examples/wibox/container/background/bg.lua
+++ b/tests/examples/wibox/container/background/bg.lua
@@ -5,7 +5,7 @@ local text_widget = {
     text   = "Hello world!",
     widget = wibox.widget.textbox
 }
- 
+
 parent : setup {
     {
         text_widget,
diff --git a/tests/examples/wibox/container/background/fg.lua b/tests/examples/wibox/container/background/fg.lua
index 8e3c9450d..30e958a41 100644
--- a/tests/examples/wibox/container/background/fg.lua
+++ b/tests/examples/wibox/container/background/fg.lua
@@ -5,7 +5,7 @@ local text_widget = {
     text   = "Hello world!",
     widget = wibox.widget.textbox
 }
- 
+
 parent : setup {
     {
         text_widget,
diff --git a/tests/examples/wibox/container/rotate/angle.lua b/tests/examples/wibox/container/rotate/angle.lua
index 4fc8a0630..0e5db3789 100644
--- a/tests/examples/wibox/container/rotate/angle.lua
+++ b/tests/examples/wibox/container/rotate/angle.lua
@@ -26,31 +26,27 @@ local function create_arrow(text)                           --DOC_HIDE
 end                                                         --DOC_HIDE
 
 local normal = create_arrow("Normal")
- 
+
 local north  = wibox.container {
     create_arrow("North"),
- 
     direction = "north",
     widget    = wibox.container.rotate
 }
- 
+
 local south  = wibox.container {
     create_arrow("South"),
- 
     direction = "south",
     widget    = wibox.container.rotate
 }
- 
+
 local east  = wibox.container {
     create_arrow("East"),
- 
     direction = "east",
     widget    = wibox.container.rotate
 }
- 
+
 local west  = wibox.container {
     create_arrow("West"),
- 
     direction = "west",
     widget    = wibox.container.rotate
 }
diff --git a/tests/examples/wibox/layout/defaults/ratio.lua b/tests/examples/wibox/layout/defaults/ratio.lua
index 149109a08..397d74905 100644
--- a/tests/examples/wibox/layout/defaults/ratio.lua
+++ b/tests/examples/wibox/layout/defaults/ratio.lua
@@ -7,7 +7,7 @@ local w = wibox.widget {
     generic_widget( "third"  ),
     layout  = wibox.layout.ratio.horizontal
 }
- 
+
 w:ajust_ratio(2, 0.44, 0.33, 0.22)
 
 return w --DOC_HIDE
diff --git a/tests/examples/wibox/widget/checkbox/custom.lua b/tests/examples/wibox/widget/checkbox/custom.lua
index 2309a4445..f88fd8df4 100644
--- a/tests/examples/wibox/widget/checkbox/custom.lua
+++ b/tests/examples/wibox/widget/checkbox/custom.lua
@@ -11,7 +11,7 @@ parent:add( --DOC_HIDE
         forced_height = 20, --DOC_HIDE
         check_shape   = function(cr, width, height)
             local rs = math.min(width, height)
-            
+
             cr:move_to( 0  , 0  )
             cr:line_to( rs , 0  )
             cr:move_to( 0  , 0  )
diff --git a/themes/xresources/theme.lua b/themes/xresources/theme.lua
index 6be76e7bc..d31a07ddc 100644
--- a/themes/xresources/theme.lua
+++ b/themes/xresources/theme.lua
@@ -62,7 +62,7 @@ theme = theme_assets.recolor_titlebar_normal(theme, theme.fg_normal)
 theme = theme_assets.recolor_titlebar_focus(theme, theme.fg_focus)
 theme = theme_assets.recolor_layout(theme, theme.fg_normal)
 
--- Define the icon theme for application icons. If not set then the icons 
+-- Define the icon theme for application icons. If not set then the icons
 -- from /usr/share/icons and /usr/share/icons/hicolor will be used.
 theme.icon_theme = nil