resolves #1170 and #841 expand tabs properly

- introduce tabsize attribute to control size of tab character
- expand tabs in verbatim blocks if tab present and value of tabsize attribute is positive
- rename reset_block_indent! to adjust_indentation!
- only use adjust_indentation! on include if indent is specified
- only expand tabs in included content if indent attribute is set
- use adjust_indentation! to remove left margin in paragraphs marked normal
- don't add indentation to empty lines
- set tab-size property to 4 in default stylesheet
- increase letter spacing in blockquote cite in default stylesheet
- add and fix tests

1 files changed, 2 insertions, 1 deletions

diff --git a/data/stylesheets/asciidoctor-default.css b/data/stylesheets/asciidoctor-default.css
index b9675787..f49e7b03 100644
--- a/data/stylesheets/asciidoctor-default.css
+++ b/data/stylesheets/asciidoctor-default.css
@@ -107,6 +107,7 @@ table thead tr th,table thead tr td,table tfoot tr th,table tfoot tr td{padding:
 table tr th,table tr td{padding:.5625em .625em;font-size:inherit;color:rgba(0,0,0,.8)}
 table tr.even,table tr.alt,table tr:nth-of-type(even){background:#f8f8f7}
 table thead tr th,table tfoot tr th,table tbody tr td,table tr td,table tfoot tr td{display:table-cell;line-height:1.6}
+body{tab-size:4}
 h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{line-height:1.2;word-spacing:-.05em}
 h1 strong,h2 strong,h3 strong,#toctitle strong,.sidebarblock>.content>.title strong,h4 strong,h5 strong,h6 strong{font-weight:400}
 .clearfix:before,.clearfix:after,.float-group:before,.float-group:after{content:" ";display:table}
@@ -227,7 +228,7 @@ table.pyhltable .linenodiv{background:none!important;padding-right:0!important}
 .verseblock .attribution{margin-top:1.25rem;margin-left:.5ex}
 .quoteblock .attribution,.verseblock .attribution{font-size:.9375em;line-height:1.45;font-style:italic}
 .quoteblock .attribution br,.verseblock .attribution br{display:none}
-.quoteblock .attribution cite,.verseblock .attribution cite{display:block;letter-spacing:-.05em;color:rgba(0,0,0,.6)}
+.quoteblock .attribution cite,.verseblock .attribution cite{display:block;letter-spacing:-.025em;color:rgba(0,0,0,.6)}
 .quoteblock.abstract{margin:0 0 1.25em 0;display:block}
 .quoteblock.abstract blockquote,.quoteblock.abstract blockquote p{text-align:left;word-spacing:0}
 .quoteblock.abstract blockquote:before,.quoteblock.abstract blockquote p:first-of-type:before{display:none}