diff --git a/lib/awful/client.lua b/lib/awful/client.lua
index cda5dd061..68de1b38e 100644
--- a/lib/awful/client.lua
+++ b/lib/awful/client.lua
@@ -984,6 +984,7 @@ capi.client.connect_signal("property::fullscreen", update_implicitly_floating)
 capi.client.connect_signal("property::maximized_vertical", update_implicitly_floating)
 capi.client.connect_signal("property::maximized_horizontal", update_implicitly_floating)
 capi.client.connect_signal("property::maximized", update_implicitly_floating)
+capi.client.connect_signal("property::fullscreen", update_implicitly_floating)
 capi.client.connect_signal("property::size_hints", update_implicitly_floating)
 capi.client.connect_signal("request::manage", update_implicitly_floating)
 
diff --git a/lib/awful/permissions/init.lua b/lib/awful/permissions/init.lua
index 909544293..64673d3f7 100644
--- a/lib/awful/permissions/init.lua
+++ b/lib/awful/permissions/init.lua
@@ -608,32 +608,39 @@ end, "mouse_enter")
 function permissions.update_border(c, context)
     if not pcommon.check(c, "client", "border", context) then return end
 
-    local suffix, fallback = "", ""
+    local suffix, fallback1, fallback2 = "", ""
 
     -- Add the sub-namespace.
     if c.fullscreen then
-        suffix, fallback = "_fullscreen", "_fullscreen"
+        suffix, fallback1 = "_fullscreen", "_fullscreen"
     elseif c.maximized then
-        suffix, fallback = "_maximized", "_maximized"
+        suffix, fallback1 = "_maximized", "_maximized"
     elseif c.floating then
-        suffix, fallback = "_floating", "_floating"
+        suffix, fallback1 = "_floating", "_floating"
     end
 
     -- Add the state suffix.
     if c.urgent then
-        suffix = suffix .. "_urgent"
+        suffix, fallback2 = suffix .. "_urgent", "_urgent"
     elseif c.active then
-        suffix = suffix .. "_active"
+        suffix, fallback2 = suffix .. "_active", "_active"
     elseif context == "added" then
-        suffix = suffix .. "_new"
+        suffix, fallback2 = suffix .. "_new", "_new"
     else
-        suffix = suffix .. "_normal"
+        suffix, fallback2 = suffix .. "_normal", "_normal"
     end
 
     if not c._private._user_border_width then
-        c._border_width = beautiful["border_width"..suffix]
-            or beautiful["border_width"..fallback]
-            or beautiful.border_width
+        local bw = beautiful["border_width"..suffix]
+            or beautiful["border_width"..fallback1]
+            or beautiful["border_width"..fallback2]
+
+        -- The default `awful.permissions.geometry` handler removes the border.
+        if (not bw) and (c.fullscreen or c.maximized) then
+            bw = 0
+        end
+
+        c._border_width = bw or beautiful.border_width
     end
 
     if not c._private._user_border_color then
@@ -657,8 +664,12 @@ function permissions.update_border(c, context)
 
         local tv = beautiful["border_color"..suffix]
 
-        if fallback ~= "" and not tv then
-            tv = beautiful["border_color"..fallback]
+        if (not tv) and fallback1 ~= "" then
+            tv = beautiful["border_color"..fallback1]
+        end
+
+        if (not tv) and (fallback2 ~= "") then
+            tv = beautiful["border_color"..fallback2]
         end
 
         -- The old theme variable did not have "color" in its name.
@@ -688,8 +699,12 @@ function permissions.update_border(c, context)
     if not c._private._user_opacity then
         local tv = beautiful["opacity"..suffix]
 
-        if fallback ~= "" and not tv then
-            tv = beautiful["opacity"..fallback]
+        if fallback1 ~= "" and not tv then
+            tv = beautiful["opacity"..fallback1]
+        end
+
+        if fallback2 ~= "" and not tv then
+            tv = beautiful["opacity"..fallback2]
         end
 
         if tv then
diff --git a/lib/awful/placement.lua b/lib/awful/placement.lua
index d57b817e9..f25569a69 100644
--- a/lib/awful/placement.lua
+++ b/lib/awful/placement.lua
@@ -383,7 +383,7 @@ end
 area_common = function(d, new_geo, ignore_border_width, args)
     -- The C side expect no arguments, nil isn't valid
     if new_geo and args.zap_border_width then
-        d.border_width = 0
+        d._border_width = 0
     end
     local geometry = new_geo and d:geometry(new_geo) or d:geometry()
     local border = ignore_border_width and 0 or d.border_width or 0
@@ -1633,7 +1633,7 @@ function placement.restore(d, args)
 
     end
 
-    d.border_width = memento.border_width
+    d._border_width = memento.border_width
 
     -- Don't use the memento as it would be "destructive", since `x`, `y`
     -- and `screen` have to be modified.
diff --git a/lib/awful/titlebar.lua b/lib/awful/titlebar.lua
index fe16719a7..9952a743a 100644
--- a/lib/awful/titlebar.lua
+++ b/lib/awful/titlebar.lua
@@ -583,6 +583,7 @@ local function new(c, args)
         bars[position] = {
             args = args,
             drawable = ret,
+            font = args.font or beautiful.titlebar_font,
             update_colors = update_colors
         }
 
@@ -683,6 +684,20 @@ local function update_on_signal(c, signal, widget)
     table.insert(widgets, widget)
 end
 
+--- Honor the font.
+local function draw_title(self, ctx, cr, width, height)
+    if ctx.position and ctx.client then
+        local bars = all_titlebars[ctx.client]
+        local data = bars and bars[ctx.position]
+
+        if data and data.font then
+            self:set_font(data.font)
+        end
+    end
+
+    textbox.draw(self, ctx, cr, width, height)
+end
+
 --- Create a new title widget.
 --
 -- A title widget displays the name of a client.
@@ -694,6 +709,9 @@ end
 -- @constructorfct awful.titlebar.widget.titlewidget
 function titlebar.widget.titlewidget(c)
     local ret = textbox()
+
+    rawset(ret, "draw", draw_title)
+
     local function update()
         ret:set_text(c.name or titlebar.fallback_name)
     end
diff --git a/lib/awful/widget/layoutlist.lua b/lib/awful/widget/layoutlist.lua
index a9c8ccaca..5fac6cd86 100644
--- a/lib/awful/widget/layoutlist.lua
+++ b/lib/awful/widget/layoutlist.lua
@@ -245,7 +245,7 @@ local layoutlist = {}
 
 --- The space between the layouts.
 -- @beautiful beautiful.layoutlist_spacing
--- @tparam[opt=0] number spacing The spacing between tasks.
+-- @tparam[opt=0] number spacing The spacing between layouts.
 
 --- The default layoutlist elements shape.
 -- @beautiful beautiful.layoutlist_shape
@@ -314,10 +314,10 @@ function layoutlist:set_base_layout(layout)
         layout or wibox.layout.fixed.horizontal
     )
 
-    if self._private.layout.set_spacing then
-        self._private.layout:set_spacing(
-            self._private.style.spacing or beautiful.tasklist_spacing or 0
-        )
+    local spacing = self._private.style.spacing or beautiful.tasklist_spacing
+
+    if self._private.layout.set_spacing and spacing then
+        self._private.layout:set_spacing(spacing)
     end
 
     assert(self._private.layout.is_widget)
@@ -363,7 +363,7 @@ end
 --- Create a layout list.
 --
 -- @tparam table args
--- @tparam widget args.layout The widget layout (not to be confused with client
+-- @tparam widget args.base_layout The widget layout (not to be confused with client
 --  layout).
 -- @tparam table args.buttons A table with buttons binding to set.
 -- @tparam[opt=awful.widget.layoutlist.source.for_screen] function args.source A
@@ -400,6 +400,8 @@ local function update_common()
 end
 
 local function new(_, args)
+    args = args or {}
+
     local ret = wibox.widget.base.make_widget(nil, nil, {
         enable_properties = true,
     })
@@ -413,11 +415,15 @@ local function new(_, args)
 
     reload_cache(ret)
 
-    -- Apply all args properties
-    gtable.crush(ret, args)
+    -- Apply all args properties. Make sure "set_layout" doesn't override
+    -- the widget `layout` method.
+    local l = args.layout
+    args.layout = nil
+    gtable.crush(ret, args, false)
+    args.layout = l
 
     if not ret._private.layout then
-        ret:set_base_layout()
+        ret:set_base_layout(args.layout)
     end
 
     assert(ret._private.layout)
diff --git a/lib/wibox/widget/textbox.lua b/lib/wibox/widget/textbox.lua
index 26f6ea2f0..b733f4343 100644
--- a/lib/wibox/widget/textbox.lua
+++ b/lib/wibox/widget/textbox.lua
@@ -332,12 +332,47 @@ end
 
 --- Set a textbox font.
 --
+-- There is multiple valid font string representation. The most precise is
+-- [XFT](https://wiki.archlinux.org/title/X_Logical_Font_Description). It
+-- is also possible to use the family name, followed by the face and size
+-- such as `Monospace Bold 10`. This script lists the fonts present
+-- on your system:
+--
+--    #!/usr/bin/env lua
+--
+--    local lgi = require("lgi")
+--    local pangocairo = lgi.PangoCairo
+--
+--    local font_map = pangocairo.font_map_get_default()
+--
+--    for k, v in pairs(font_map:list_families()) do
+--        print(v:get_name(), "monospace?: "..tostring(v:is_monospace()))
+--        for k2, v2 in ipairs(v:list_faces()) do
+--            print("    ".. v2:get_face_name())
+--        end
+--    end
+--
+-- Save this script somewhere on your system, `chmod +x` it and run it. It
+-- will list something like:
+--
+--    Sans    monospace?: false
+--        Regular
+--        Bold
+--        Italic
+--        Bold Italic
+--
+-- In this case, the font could be `Sans 10` or `Sans Bold Italic 10`.
+--
 -- @property font
 -- @tparam string font The font description as string.
 -- @propemits true false
 -- @propbeautiful
 
 function textbox:set_font(font)
+    if font == self._private.font then return end
+
+    self._private.font = font
+
     self._private.layout:set_font_description(beautiful.get_font(font))
     self:emit_signal("widget::redraw_needed")
     self:emit_signal("widget::layout_changed")
diff --git a/tests/test-client-borders.lua b/tests/test-client-borders.lua
new file mode 100644
index 000000000..d9d044e7c
--- /dev/null
+++ b/tests/test-client-borders.lua
@@ -0,0 +1,190 @@
+-- Brute force every possible states and see what blows up.
+--
+-- The goal is to detect "other" code paths within the core
+-- which have the side effect of accidentally marking the border
+-- to be user-specified. When this happens, all theme variables
+-- stop working.
+--
+-- For example, fullscreen caused an issue because the default
+-- request::geometry modified the border_width.
+local beautiful = require("beautiful")
+local aclient = require("awful.client")
+local test_client = require("_client")
+
+local steps = {}
+local used_colors = {}
+local state_colors, state_widths = {}, {}
+local state_setter = {}
+local c = nil
+
+-- Make sure it uses `beautiful.border_width` (default) again.
+local function reset()
+    client.focus = nil
+    c.urgent     = false
+    c.maximized  = false
+    c.fullscreen = false
+
+    -- Use the low level API because `floating` has an implicit/explicit
+    -- mode just like the border.
+    aclient.property.set(c, "floating", nil)
+end
+
+local function gen_random_color(state)
+    while true do
+        local str = "#"
+        for _=1, 3 do
+            local part = string.format("%x", math.ceil(math.random() * 255))
+            part = #part == 1 and ("0"..part) or part
+            str = str .. part
+        end
+
+        if not used_colors[str] then
+            used_colors[str] = state
+            return str
+        end
+    end
+end
+
+local function check_state(state)
+    reset()
+
+    if state_setter[state] then
+        local col = "border_color" .. state
+        local w = "border_width" .. state
+        state_setter[state](client.get()[1])
+
+        assert(c.border_color ~= nil)
+        assert(c.border_width ~= nil)
+        assert(
+            c.border_color == state_colors[col],
+            "Expected "..state_colors[col].." for "..state.. " but got "..c.border_color..
+            " for "..(used_colors[c.border_color] or "nil")
+        )
+
+        if not state:find("full") then
+            assert(c.border_width == state_widths[w])
+        else
+            assert(c.border_width == 0)
+        end
+
+        assert(not c._private._user_border_width)
+        assert(not c._private._user_border_color)
+    end
+
+    return true
+end
+
+local function clear_theme()
+    for k in pairs(beautiful) do
+        if k:find("border_") then
+            beautiful[k] = nil
+        end
+    end
+
+    return true
+end
+
+for _, state1 in ipairs {"_fullscreen", "_maximized", "_floating" } do
+    local color = "border_color" .. state1
+    local width = "border_width" .. state1
+
+    state_widths[width] = math.floor(math.random() * 10)
+    state_colors[color] = gen_random_color(color)
+
+    for _, state2 in ipairs {"_urgent", "_active", "_new", "_normal" } do
+        color = "border_color" .. state1 .. state2
+        width = "border_width" .. state1 .. state2
+
+        state_widths[width] = math.floor(math.random() * 10)
+        state_colors[color] = gen_random_color(color)
+    end
+end
+
+for _, state in ipairs {"_urgent", "_active", "_new", "_normal" } do
+    local color = "border_color" .. state
+    local width = "border_width" .. state
+
+    state_widths[width] = math.floor(math.random() * 10)
+    state_colors[color] = gen_random_color(color)
+    beautiful[width] = state_widths[width]
+    beautiful[color] = state_colors[color]
+end
+
+function state_setter._urgent()
+    c.urgent = true
+end
+
+function state_setter._fullscreen()
+    c.fullscreen = true
+end
+
+function state_setter._floating()
+    c.floating = true
+end
+
+function state_setter._active()
+    client.focus = c
+end
+
+function state_setter._maximized()
+    c.maximized = true
+end
+
+function state_setter._normal()
+    -- no-op
+end
+
+test_client()
+
+table.insert(steps, function()
+    c = client.get()[1]
+    return c and true or nil
+end)
+
+for _, state in ipairs {"_urgent", "_active", "_new", "_normal" } do
+    table.insert(steps, function()
+        return check_state(state)
+    end)
+end
+
+table.insert(steps, clear_theme)
+
+table.insert(steps, function()
+    for _, state in ipairs {"_fullscreen", "_maximized", "_floating" } do
+        local color = "border_color" .. state
+        local width = "border_width" .. state
+
+        beautiful[width] = state_widths[width]
+        beautiful[color] = state_colors[color]
+    end
+
+    return true
+end)
+
+for _, state in ipairs {"_fullscreen", "_maximized", "_floating" } do
+    table.insert(steps, function()
+        return check_state(state)
+    end)
+end
+
+table.insert(steps, clear_theme)
+
+table.insert(steps, function()
+    -- Add everything to the theme.
+    for _, mode in ipairs {state_colors, state_widths} do
+        for key, value in pairs(mode) do
+            beautiful[key] = value
+        end
+    end
+    return true
+end)
+
+for _, state1 in ipairs {"_fullscreen", "_maximized", "_floating" } do
+    for _, state2 in ipairs {"_urgent", "_active", "_new", "_normal" } do
+        table.insert(steps, function()
+            return check_state(state1 .. state2)
+        end)
+    end
+end
+
+require("_runner").run_steps(steps)
diff --git a/tests/test-selection-getter.lua b/tests/test-selection-getter.lua
index 9d9193556..afac47034 100644
--- a/tests/test-selection-getter.lua
+++ b/tests/test-selection-getter.lua
@@ -8,6 +8,8 @@ local lgi = require("lgi")
 local Gio = lgi.Gio
 local GdkPixbuf = lgi.GdkPixbuf
 
+local pids = {}
+
 local lua_executable = os.getenv("LUA")
 if lua_executable == nil or lua_executable == "" then
     lua_executable = "lua"
@@ -53,8 +55,9 @@ runner.run_steps{
 
     -- Clear the clipboard to get to a known state
     function()
-        spawn.with_line_callback({ lua_executable, "-e", acquire_and_clear_clipboard },
+        local pid = spawn.with_line_callback({ lua_executable, "-e", acquire_and_clear_clipboard },
             { exit = function() continue = true end })
+        table.insert(pids, pid)
         return true
     end,
 
@@ -84,13 +87,15 @@ runner.run_steps{
 
         -- Now set the clipboard to some text
         continue = false
-        spawn.with_line_callback({ lua_executable, "-e", acquire_clipboard_text },
+        local pid = spawn.with_line_callback({ lua_executable, "-e", acquire_clipboard_text },
             { stdout = function(line)
                 assert(line == "initialisation done",
                     "Unexpected line: " .. line)
                 continue = true
             end })
 
+        table.insert(pids, pid)
+
         return true
     end,
 
@@ -148,13 +153,15 @@ runner.run_steps{
 
         -- Now set the clipboard to an image
         continue = false
-        spawn.with_line_callback({ lua_executable, "-e", acquire_clipboard_pixbuf },
+        local pid = spawn.with_line_callback({ lua_executable, "-e", acquire_clipboard_pixbuf },
             { stdout = function(line)
                 assert(line == "initialisation done",
                     "Unexpected line: " .. line)
                 continue = true
             end })
 
+        table.insert(pids, pid)
+
         return true
     end,
 
@@ -194,6 +201,12 @@ runner.run_steps{
             return
         end
 
+        -- There are now "windows", so they have no "clients", however,
+        -- they talk to X11 and wont exit by themselves and must be killed.
+        for _, pid in ipairs(pids) do
+            awesome.kill(pid, 9)
+        end
+
         return true
     end,
 }
diff --git a/tests/test-selection-watcher.lua b/tests/test-selection-watcher.lua
index 3721a67f8..2e9d6a647 100644
--- a/tests/test-selection-watcher.lua
+++ b/tests/test-selection-watcher.lua
@@ -3,6 +3,8 @@
 local runner = require("_runner")
 local spawn = require("awful.spawn")
 
+local pids = {}
+
 local lua_executable = os.getenv("LUA")
 if lua_executable == nil or lua_executable == "" then
     lua_executable = "lua"
@@ -67,8 +69,11 @@ runner.run_steps{
     -- Clear the clipboard to get to a known state
     function()
         check_state(0, 0)
-        spawn.with_line_callback({ lua_executable, "-e", acquire_and_clear_clipboard },
+        local pid = spawn.with_line_callback({ lua_executable, "-e", acquire_and_clear_clipboard },
             { exit = function() continue = true end })
+
+        table.insert(pids, pid)
+
         return true
     end,
 
@@ -86,13 +91,15 @@ runner.run_steps{
 
         -- Set the clipboard
         continue = false
-        spawn.with_line_callback({ lua_executable, "-e", acquire_clipboard },
+        local pid = spawn.with_line_callback({ lua_executable, "-e", acquire_clipboard },
             { stdout = function(line)
                 assert(line == "initialisation done",
                     "Unexpected line: " .. line)
                 continue = true
             end })
 
+        table.insert(pids, pid)
+
         return true
     end,
 
@@ -105,9 +112,11 @@ runner.run_steps{
 
         -- Now clear the clipboard again
         continue = false
-        spawn.with_line_callback({ lua_executable, "-e", acquire_and_clear_clipboard },
+        local pid = spawn.with_line_callback({ lua_executable, "-e", acquire_and_clear_clipboard },
             { exit = function() continue = true end })
 
+        table.insert(pids, pid)
+
         return true
     end,
 
@@ -118,6 +127,13 @@ runner.run_steps{
         end
 
         check_state(2, 1)
+
+        -- There are now "windows", so they have no "clients", however,
+        -- they talk to X11 and wont exit by themselves and must be killed.
+        for _, pid in ipairs(pids) do
+            awesome.kill(pid, 9)
+        end
+
         return true
     end
 }
diff --git a/tests/test-titlebar.lua b/tests/test-titlebar.lua
index d80f19371..4b0b8d4b5 100644
--- a/tests/test-titlebar.lua
+++ b/tests/test-titlebar.lua
@@ -3,6 +3,7 @@ local titlebar = require("awful.titlebar")
 local rules = require("ruled.client")
 local spawn = require("awful.spawn")
 local gdebug = require("gears.debug")
+local textbox = require("wibox.widget.textbox")
 
 local lua_executable = os.getenv("LUA")
 if lua_executable == nil or lua_executable == "" then
@@ -17,10 +18,8 @@ window = Gtk.Window {default_width=100, default_height=100, title='title'}
 %s
 window:set_wmclass(class, class)
 local app = Gtk.Application {}
-function app:on_activate()
-    window.application = self
-    window:show_all()
-end
+window:show_all()
+Gtk:main{...}
 app:run {''}
 ]]
 local tiny_client = { lua_executable, "-e", string.format(tiny_client_code_template, "") }
@@ -30,12 +29,21 @@ window.decorated = false
 ]])
 }
 
+local found_font = nil
+
 -- Use the test client props
 local dep = gdebug.deprecate
 gdebug.deprecate = function() end
 rules.rules = {}
 gdebug.deprecate = dep
 
+local function kill_client(c)
+    -- Make sure the process finishes. Just `c:kill()` only
+    -- closes the window. Adding some handlers to the GTK "app"
+    -- created some unwanted side effects in the CI.
+    awesome.kill(c.pid, 9)
+end
+
 -- Too bad there's no way to disconnect the rc.lua request::titlebars function
 
 local steps = {
@@ -69,7 +77,7 @@ local steps = {
         titlebar.toggle(c, "top")
         assert(c.height == 100)
 
-        c:kill()
+        kill_client(c)
 
         return true
     end,
@@ -100,7 +108,7 @@ local steps = {
 
         assert(c.width == 100 and c.height == h)
 
-        c:kill()
+        kill_client(c)
 
         return true
     end,
@@ -119,7 +127,7 @@ local steps = {
         assert(c.width == 100 and c.height > 100)
         assert(c._request_titlebars_called)
 
-        c:kill()
+        kill_client(c)
 
         return true
     end,
@@ -140,7 +148,7 @@ local steps = {
         assert(c.width == 100 and c.height > 100)
         assert(c._request_titlebars_called)
 
-        c:kill()
+        kill_client(c)
 
         return true
     end,
@@ -161,7 +169,26 @@ local steps = {
         assert(not c._request_titlebars_called)
         assert(c.width == 100 and c.height == 100)
 
-        c:kill()
+        function textbox:set_font(value)
+            found_font = value
+        end
+
+        local args = {size = 40, font = "sans 10", position = "bottom"}
+        titlebar(c, args).widget = titlebar.widget.titlewidget(c)
+
+        return true
+    end,
+    function()
+        local c = client.get()[1]
+
+        assert(found_font == "sans 10")
+
+        kill_client(c)
+
+        return true
+    end,
+    function()
+        if #client.get() > 0 then return end
 
         return true
     end,