Only use Draw button for new Oekaki.

src/General/css/style.css

@@ -1416,6 +1416,9 @@ input#qr-filename {
 #qr-no-file {
   color: #AAA;
 }
+.oekaki.has-file {
+  display: none;
+}
 .oekaki > label {
   -webkit-flex: 1 1 auto;
   flex: 1 1 auto;

src/Posting/QR.coffee

@@ -474,6 +474,7 @@ QR =
     setNode 'texPreview',     '#tex-preview'
     setNode 'dumpList',       '#dump-list'
     setNode 'addPost',        '#add-post'
+    setNode 'oekaki',         '.oekaki'
     setNode 'drawButton',     '#qr-draw-button'
     setNode 'fileSubmit',     '#file-n-submit'
     setNode 'fileButton',     '#qr-file-button'

src/Posting/QR.oekaki.coffee

@@ -51,6 +51,7 @@ QR.oekaki =
   draw: ->
     $.global ->
       {Tegaki} = window
+      Tegaki.destroy() if Tegaki.bg
       Tegaki.open
         onDone: ->
           Tegaki.flatten().toBlob (file) ->

src/Posting/QR.post.coffee

@@ -314,8 +314,10 @@ QR.post = class
     if @file
       @updateFilename()
       QR.nodes.filename.value = @filename
+      $.addClass QR.nodes.oekaki,     'has-file'
       $.addClass QR.nodes.fileSubmit, 'has-file'
     else
+      $.rmClass QR.nodes.oekaki,     'has-file'
       $.rmClass QR.nodes.fileSubmit, 'has-file'
     QR.nodes.spoiler.checked = @spoiler