Allow priority and identity selections to be given by callers. Looks to have been intended to work this way, but never tested.

src/compose.php

@@ -73,6 +73,7 @@ if (isset($send) && $send) {
 }
 sqgetGlobalVar('session',$session, $SQ_GLOBAL);
 sqgetGlobalVar('mailbox',$mailbox, $SQ_GLOBAL);
+sqgetGlobalVar('identity',$orig_identity, $SQ_GLOBAL);
 if(!sqgetGlobalVar('identity',$identity, $SQ_GLOBAL)) {
     $identity=0;
 }
@@ -753,6 +754,12 @@ elseif (isset($sigappend)) {
     if (isset($subject)) {
         $values['subject'] = $subject;
     }
+    if (isset($mailprio)) {
+        $values['mailprio'] = $mailprio;
+    }
+    if (isset($orig_identity)) {
+        $values['identity'] = $orig_identity;
+    }
     showInputForm($session, $values);
 }