don't show subject field for replies to thread

src/General/css/style.css

@@ -869,6 +869,9 @@ span.hide-announcement {
   flex: 1;
   width: 0;
 }
+#qr.reply-to-thread input[data-name=sub] {
+  display: none;
+}
 #qr textarea.field {
   height: 14.8em;
   min-height: 9em;

src/Posting/QR.coffee

@@ -424,6 +424,7 @@ QR =
       g.THREADID
     else
       'new'
+    (if g.VIEW is 'thread' then $.addClass else $.rmClass) QR.nodes.el, 'reply-to-thread'
 
   dialog: ->
     QR.nodes = nodes =
@@ -520,7 +521,7 @@ QR =
     $.on nodes.fileInput,  'change', QR.handleFiles
 
     # save selected post's data
-    items = ['name', 'email', 'sub', 'com', 'filename', 'flag']
+    items = ['thread', 'name', 'email', 'sub', 'com', 'filename', 'flag']
     i = 0
     save = -> QR.selected.save @
     while name = items[i++]

src/Posting/QR.post.coffee

@@ -118,6 +118,7 @@ QR.post = class
     for name in ['thread', 'name', 'email', 'sub', 'com', 'filename', 'flag']
       continue unless node = QR.nodes[name]
       node.value = @[name] or node.dataset.default or null
+    (if @thread isnt 'new' then $.addClass else $.rmClass) QR.nodes.el, 'reply-to-thread'
     @showFileData()
     QR.characterCount()
 
@@ -129,6 +130,7 @@ QR.post = class
     @[name] = input.value or input.dataset.default or null
     switch name
       when 'thread'
+        (if @thread isnt 'new' then $.addClass else $.rmClass) QR.nodes.el, 'reply-to-thread'
         QR.status()
       when 'com'
         @nodes.span.textContent = @com