compose: add option to never include your own address when replying

Introduce an option in aerc.conf to disable the auto-including
of your own address when replying to your own emails (address
replies to the original To: and Cc: instead); default to true
(allow the auto-including)

commands/msg/reply.go

@@ -112,6 +112,19 @@ func (reply) Execute(aerc *widgets.Aerc, args []string) error {
 	} else {
 		to = msg.Envelope.From
 	}
+
+	if !aerc.Config().Compose.ReplyToSelf {
+		for i, v := range to {
+			if v.Address == from.Address {
+				to = append(to[:i], to[i+1:]...)
+				break
+			}
+		}
+		if len(to) == 0 {
+			to = append(msg.Envelope.To)
+		}
+	}
+
 	recSet.AddList(to)
 
 	if replyAll {

config/aerc.conf.in

@@ -194,6 +194,12 @@ header-layout=To|From,Subject
 # ignored.
 address-book-cmd=
 
+#
+# Allow to address yourself when replying
+#
+# Default: true
+reply-to-self=true
+
 [filters]
 #
 # Filters allow you to pipe an email body through a shell command to render

config/config.go

@@ -123,6 +123,7 @@ type ComposeConfig struct {
 	Editor         string     `ini:"editor"`
 	HeaderLayout   [][]string `ini:"-"`
 	AddressBookCmd string     `ini:"address-book-cmd"`
+	ReplyToSelf    bool       `ini:"reply-to-self"`
 }
 
 type FilterConfig struct {
@@ -595,6 +596,7 @@ func LoadConfigFromFile(root *string, sharedir string, logger *log.Logger) (*Aer
 				{"To", "From"},
 				{"Subject"},
 			},
+			ReplyToSelf: true,
 		},
 
 		Templates: TemplateConfig{

doc/aerc-config.5.scd

@@ -340,6 +340,13 @@ These options are configured in the *[compose]* section of aerc.conf.
 
 	Default: none
 
+*reply-to-self*
+	Allow to include your own address. Otherwise, if set to false, do not mail
+	yourself when replying (e.g., if replying to emails previously sent by
+	yourself, address your replies to the original To: and Cc:).
+
+	Default: true
+
 ## FILTERS
 
 Filters allow you to pipe an email body through a shell command to render