From d29b097216dd47b546955aac73e6a6f74d80b0ef Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 26 Nov 2012 14:20:13 +0530
Subject: [PATCH] Viewer: Fix vertical margin at the top of the first page
 incorrect in a certain rare circumstance (first child of body being an empty
 paragraph). Fixes #1082640 (ebook-viewer: top line of the text is cut off
 when using two-paged mode)

---
 resources/compiled_coffeescript.zip         | Bin 59820 -> 60149 bytes
 src/calibre/ebooks/oeb/display/paged.coffee |  12 ++++++++++++
 2 files changed, 12 insertions(+)

diff --git a/resources/compiled_coffeescript.zip b/resources/compiled_coffeescript.zip
index 215d6a2cb488d9db43dbe9cf77f3e74f6db1e24e..72ed709700d477b436218df4f01ac5ff9abfbd77 100644
GIT binary patch
delta 508
zcmZ2;nfdEgW|;tQW)=|!5U?n!a-8*A^36RD1_lt8W|(a7QgpMgiaVc>jzV&NPJDT0
zN=XKYS(;a}d5+N@*7{@xTZNST<kH;Kyb`^n{FF+)w9KO766cJ}oD^#=1uy_B2dXoG
z36uk6Qx!Bck`)wf74k}Raun<plJ)ZPQ&K}J3sM!V6w2~5Qxps|fzq}Lh6-wG5E~V2
z6pVm^)lg#<6p|GzY=H!dA*mH5!I?=pnR)4Ob70m2HGmwhpba#1a-gq>31J7=f*gQi
z<s>hW$?MHIWOEaX(lhgPlTy?2i&E8f6x0pWHDMOjZVt3qZoHX`OGauT7uV#|F9bGo
z<V>g*#0cQYE1#=O_Eq7Sy!(Z~WG*fN9&kK>32{$Q;7``&;-1X%QebkZ6tZMeBv`US
xif?kyb1f$GWH9&ab19%*QcT9VVD6t6Mof>YfJ|4WPq)D$Juju$uD$>n4*+NjnUnwk

delta 205
zcmex*m3hr&W|jbNW|qnOUrKEbO@70<S=CcUN-$_+iKEDb6&h3B85lrVdeTd|jh6O&
z9Qir%<(VlZ8JoNK_OMQlmJrxHRdj;!WRX__lbK%%Z%)art)6`JrQGEIFT^MRdMPzo
z@1+#eAI`~)FGVNEzcgiXmjW|azm!tIuz~>@$fy7n>H^J`VtSPg*5mrhh-qdenA!Kr
SfNA9|F!SmwDYl;HAe{g=?n}l1

diff --git a/src/calibre/ebooks/oeb/display/paged.coffee b/src/calibre/ebooks/oeb/display/paged.coffee
index b8a7310659..c5f2dbc97a 100644
--- a/src/calibre/ebooks/oeb/display/paged.coffee
+++ b/src/calibre/ebooks/oeb/display/paged.coffee
@@ -116,6 +116,18 @@ class PagedDisplay
         # above the columns, which causes them to effectively be added to the
         # page margins (the margin collapse algorithm)
         bs.setProperty('-webkit-margin-collapse', 'separate')
+        # Remove any webkit specified default margin from the first child of body
+        # Otherwise, you could end up with an effective negative margin, I dont
+        # understand exactly why, but see:
+        # https://bugs.launchpad.net/calibre/+bug/1082640 for an example
+        c = document.body.firstChild
+        count = 0
+        while c?.nodeType != 1 and count < 20
+            c = c?.nextSibling
+            count += 1
+        if c?.nodeType == 1
+            c.style.setProperty('-webkit-margin-before', '0')
+
 
         bs.setProperty('overflow', 'visible')
         bs.setProperty('height', (window.innerHeight - this.margin_top - this.margin_bottom) + 'px')