Implement #7877 (margin option in epub to mobi conversions)

src/calibre/ebooks/mobi/mobiml.py

@@ -184,7 +184,7 @@ class MobiMLizer(object):
                     para.attrib['value'] = str(istates[-2].list_num)
             elif tag in NESTABLE_TAGS and istate.rendered:
                 para = wrapper = bstate.nested[-1]
-            elif left > 0 and indent >= 0:
+            elif not self.opts.mobi_ignore_margins and left > 0 and indent >= 0:
                 ems = self.profile.mobi_ems_per_blockquote
                 para = wrapper = etree.SubElement(parent, XHTML('blockquote'))
                 para = wrapper

src/calibre/ebooks/mobi/output.py

@@ -39,6 +39,12 @@ class MOBIOutput(OutputFormatPlugin):
         OptionRecommendation(name='personal_doc', recommended_value='[PDOC]',
             help=_('Tag marking book to be filed with Personal Docs')
         ),
+        OptionRecommendation(name='mobi_ignore_margins',
+            recommended_value=False,
+            help=_('Ignore margins in the input document. If False, then '
+                'the MOBI output plugin will try to convert margins specified'
+                ' in the input document, otherwise it will ignore them.')
+        ),
     ])
 
     def check_for_periodical(self):

src/calibre/gui2/convert/mobi_output.py

@@ -25,6 +25,7 @@ class PluginWidget(Widget, Ui_Form):
     def __init__(self, parent, get_option, get_help, db=None, book_id=None):
         Widget.__init__(self, parent,
                 ['prefer_author_sort', 'rescale_images', 'toc_title',
+                    'mobi_ignore_margins',
                 'dont_compress', 'no_inline_toc', 'masthead_font','personal_doc']
                 )
         self.db, self.book_id = db, book_id

src/calibre/gui2/convert/mobi_output.ui

@@ -55,7 +55,7 @@
      </property>
     </widget>
    </item>
-   <item row="5" column="0" colspan="2">
+   <item row="6" column="0" colspan="2">
     <widget class="QGroupBox" name="groupBox">
      <property name="title">
       <string>Kindle options</string>
@@ -101,7 +101,7 @@
      </layout>
     </widget>
    </item>
-   <item row="6" column="0">
+   <item row="7" column="0">
     <spacer name="verticalSpacer_2">
      <property name="orientation">
       <enum>Qt::Vertical</enum>
@@ -114,6 +114,13 @@
      </property>
     </spacer>
    </item>
+   <item row="5" column="0">
+    <widget class="QCheckBox" name="opt_mobi_ignore_margins">
+     <property name="text">
+      <string>Ignore &amp;margins</string>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>