Fix handling of signatures on draft edit: Don't add new signature

and don't remove the old-one, the same for Edit as new (#1488798)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix handling of signatures on draft edit (#1488798)
 - Fix so compacting of non-empty folder is possible also when messages list is empty (#1488858)
 - Allow forwarding of multiple emails (#1486854)
 - Fix big memory consumption of DB layer (#1488856)

program/steps/mail/compose.inc

@@ -169,14 +169,15 @@ else if ($msg_uid = $COMPOSE['param']['uid']) {
 }
 
 $config_show_sig = $RCMAIL->config->get('show_sig', 1);
-if ($config_show_sig == 1)
+if ($compose_mode == RCUBE_COMPOSE_EDIT || $compose_mode == RCUBE_COMPOSE_DRAFT) {
+  // don't add signature in draft/edit mode, we'll also not remove the old-one
+}
+else if ($config_show_sig == 1)
   $OUTPUT->set_env('show_sig', true);
-else if ($config_show_sig == 2 && (empty($compose_mode) || $compose_mode == RCUBE_COMPOSE_EDIT || $compose_mode == RCUBE_COMPOSE_DRAFT))
+else if ($config_show_sig == 2 && empty($compose_mode))
   $OUTPUT->set_env('show_sig', true);
 else if ($config_show_sig == 3 && ($compose_mode == RCUBE_COMPOSE_REPLY || $compose_mode == RCUBE_COMPOSE_FORWARD))
   $OUTPUT->set_env('show_sig', true);
-else
-  $OUTPUT->set_env('show_sig', false);
 
 // set line length for body wrapping
 $LINE_LENGTH = $RCMAIL->config->get('line_length', 72);
@@ -741,8 +742,10 @@ function rcmail_compose_part_body($part, $isHtml = false)
         }
         else {
             // try to remove the signature
-            if ($RCMAIL->config->get('strip_existing_sig', true)) {
-                $body = rcmail_remove_signature($body);
+            if ($compose_mode != RCUBE_COMPOSE_DRAFT && $compose_mode != RCUBE_COMPOSE_EDIT) {
+                if ($RCMAIL->config->get('strip_existing_sig', true)) {
+                    $body = rcmail_remove_signature($body);
+                }
             }
             // add HTML formatting
             $body = rcmail_plain_body($body);
@@ -773,8 +776,10 @@ function rcmail_compose_part_body($part, $isHtml = false)
             }
 
             // try to remove the signature
-            if ($RCMAIL->config->get('strip_existing_sig', true)) {
-                $body = rcmail_remove_signature($body);
+            if ($compose_mode != RCUBE_COMPOSE_DRAFT && $compose_mode != RCUBE_COMPOSE_EDIT) {
+                if ($RCMAIL->config->get('strip_existing_sig', true)) {
+                    $body = rcmail_remove_signature($body);
+                }
             }
         }
     }