Add KeepQuotedReply option for matrix to fix regression (#1823)

Matrix quotes replies and as of matterbridge 1.24.0 we strip those as this causes
issues with bridges support threading and have PreserveThreading enabled.

Introduced via 9a8ce9b17e

But if you for example use mattermost or discord with webhooks you'll need to enable
this if you want something that looks like a reply from matrix.
See issues:
- https://github.com/42wim/matterbridge/issues/1819
- https://github.com/42wim/matterbridge/issues/1780

bridge/discord/discord.go

@@ -272,8 +272,6 @@ func (b *Bdiscord) Send(msg config.Message) (string, error) {
 	// Handle prefix hint for unthreaded messages.
 	if msg.ParentNotFound() {
 		msg.ParentID = ""
-		msg.Text = strings.TrimPrefix(msg.Text, "\n")
-		msg.Text = fmt.Sprintf("> %s %s", msg.Username, msg.Text)
 	}
 
 	// Use webhook to send the message

bridge/matrix/matrix.go

@@ -428,6 +428,8 @@ func (b *Bmatrix) handleReply(ev *matrix.Event, rmsg config.Message) bool {
 	}
 
 	body := rmsg.Text
+
+	if !b.GetBool("keepquotedreply") {
 		for strings.HasPrefix(body, "> ") {
 			lineIdx := strings.IndexRune(body, '\n')
 			if lineIdx == -1 {
@@ -436,6 +438,7 @@ func (b *Bmatrix) handleReply(ev *matrix.Event, rmsg config.Message) bool {
 				body = body[(lineIdx + 1):]
 			}
 		}
+	}
 
 	rmsg.Text = body
 	rmsg.ParentID = relation.InReplyTo.EventID

bridge/mattermost/helpers.go

@@ -183,6 +183,7 @@ func (b *Bmattermost) sendWebhook(msg config.Message) (string, error) {
 	if b.GetBool("PrefixMessagesWithNick") {
 		msg.Text = msg.Username + msg.Text
 	}
+
 	if msg.Extra != nil {
 		// this sends a message only if we received a config.EVENT_FILE_FAILURE_SIZE
 		for _, rmsg := range helper.HandleExtra(&msg, b.General) {

matterbridge.toml.sample

@@ -1328,6 +1328,15 @@ HTMLDisable=false
 # UseUserName shows the username instead of the server nickname
 UseUserName=false
 
+# Matrix quotes replies and as of matterbridge 1.24.0 we strip those as this causes
+# issues with bridges support threading and have PreserveThreading enabled.
+# But if you for example use mattermost or discord with webhooks you'll need to enable 
+# this (and keep PreserveThreading disabled) if you want something that looks like a reply from matrix.
+# See issues: 
+# - https://github.com/42wim/matterbridge/issues/1819
+# - https://github.com/42wim/matterbridge/issues/1780
+KeepQuotedReply=false
+
 #Nicks you want to ignore.
 #Regular expressions supported
 #Messages from those users will not be sent to other bridges.