Add MouseEnabled config setting

This patch adds the ability to control whether aerc captures mouseevents
or not. By default it will be set to not capture events.

config/aerc.conf.in

@@ -32,6 +32,11 @@ empty-message=(no messages)
 # Default: (no folders)
 empty-dirlist=(no folders)
 
+# Enable mouse events in the ui, e.g. clicking and scrolling with the mousewheel
+#
+# Default: false
+mouse-enabled=false
+
 [viewer]
 #
 # Specifies the pager to use when displaying emails. Note that some filters

config/config.go

@@ -31,6 +31,7 @@ type UIConfig struct {
 	PreviewHeight     int      `ini:"preview-height"`
 	EmptyMessage      string   `ini:"empty-message"`
 	EmptyDirlist      string   `ini:"empty-dirlist"`
+	MouseEnabled      bool     `ini:"mouse-enabled"`
 }
 
 const (
@@ -320,6 +321,7 @@ func LoadConfigFromFile(root *string, sharedir string) (*AercConfig, error) {
 			PreviewHeight:     12,
 			EmptyMessage:      "(no messages)",
 			EmptyDirlist:      "(no folders)",
+			MouseEnabled:      false,
 		},
 	}
 	// These bindings are not configurable

doc/aerc-config.5.scd

@@ -96,6 +96,11 @@ These options are configured in the *[ui]* section of aerc.conf.
 
 	Default: (no folders)
 
+*mouse-enabled*
+	Enable mouse events in the ui, e.g. clicking and scrolling with the mousewheel
+
+	Default: false
+
 ## VIEWER
 
 These options are configured in the *[viewer]* section of aerc.conf.

lib/ui/ui.go

@@ -32,7 +32,9 @@ func Initialize(conf *config.AercConfig,
 
 	screen.Clear()
 	screen.HideCursor()
+	if conf.Ui.MouseEnabled {
 		screen.EnableMouse()
+	}
 
 	width, height := screen.Size()