From 59e11503f08ee3d37861609eb528c74a4fb8b131 Mon Sep 17 00:00:00 2001
From: ccd0 <admin@containerchan.org>
Date: Sun, 21 Dec 2014 20:35:22 -0800
Subject: [PATCH] Stop anomalous scrolling on space/tab in captcha iframe. #231

This is seriously hacky, but probably better than ignoring the issue.
Improvements welcome.
---
 src/Posting/QR.coffee | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/Posting/QR.coffee b/src/Posting/QR.coffee
index 7c3288ff3..66acfd418 100644
--- a/src/Posting/QR.coffee
+++ b/src/Posting/QR.coffee
@@ -140,6 +140,19 @@ QR =
       if $.hasClass(QR.nodes.el, 'autohide') and focus isnt $.hasClass(QR.nodes.el, 'focus')
         QR.captcha[if focus then 'setup' else 'destroy']()
       $[if focus then 'addClass' else 'rmClass'] QR.nodes.el, 'focus'
+      if chrome?
+        # XXX Stop anomalous scrolling on space/tab in captcha iframe.
+        if d.activeElement and QR.nodes.el.contains(d.activeElement) and d.activeElement.nodeName is 'IFRAME'
+          QR.scrollY = window.scrollY
+          $.on d, 'scroll', QR.scrollLock
+          $.one d, 'mousemove wheel', -> $.off d, 'scroll', QR.scrollLock
+        else
+          $.off d, 'scroll', QR.scrollLock
+  scrollLock: (e) ->
+    if d.activeElement and QR.nodes.el.contains(d.activeElement) and d.activeElement.nodeName is 'IFRAME'
+      window.scroll window.scrollX, QR.scrollY
+    else
+      $.off d, 'scroll', QR.scrollLock
   hide: ->
     QR.captcha.destroy()
     d.activeElement.blur()