Merge remote-tracking branch 'origin/master' into 7FM/master

# Conflicts:
#	include/modules/pulseaudio_slider.hpp
#	include/util/audio_backend.hpp
#	man/waybar-pulseaudio-slider.5.scd
#	src/modules/pulseaudio_slider.cpp
#	src/util/audio_backend.cpp

man/waybar-pulseaudio-slider.5.scd

@@ -28,9 +28,20 @@ The volume can be controlled by dragging the slider across the bar or clicking o
     The orientation of the slider. Can be either `horizontal` or `vertical`.
 
 *expand*: ++
-	typeof: bool ++
-	default: false ++
-	Enables this module to consume all left over space dynamically.
+    typeof: bool ++
+    default: false ++
+    Enables this module to consume all left over space dynamically.
+
+*zero-on-mute*: ++
+    typeof: bool ++
+    default: true ++
+    `true` = The slider will be set to `min` when the source/sink is muted. ++
+    `false` = The slider will continue to show the unmuted volume level when the source/sink is muted.
+
+*unmute-on-volume-change*: ++
+    typeof: bool ++
+    default: true ++
+    Specifies whether to unmute a muted souce/sink when its volume is changed by the user moving the slider.
 
 *target*: ++
 	typeof: string ++
@@ -47,7 +58,9 @@ The volume can be controlled by dragging the slider across the bar or clicking o
 "pulseaudio/slider#out": {
     "min": 0,
     "max": 100,
-    "orientation": "horizontal"
+    "orientation": "horizontal",
+    "zero-on-mute": false,
+    "unmute-on-volume-change": false
 },
 "pulseaudio/slider#in": {
     "min": 0,
@@ -64,6 +77,9 @@ The slider is a component with multiple CSS Nodes, of which the following are ex
 *#pulseaudio-slider*: ++
     Controls the style of the box *around* the slider and bar.
 
+*#pulseaudio-slider.muted*: ++
+    Controls the style when the audio source/sink is muted.
+
 *#pulseaudio-slider slider*: ++
     Controls the style of the slider handle.
 
@@ -97,4 +113,8 @@ The slider is a component with multiple CSS Nodes, of which the following are ex
     border-radius: 5px;
     background: green;
 }
+
+#pulseaudio-slider.muted highlight {
+    background-color: orange;
+}
 ```