tdf#104016 RTF import: deduplicate before text indent from numbering

We already deduplicated first line indentation since commit
3915bf2d (tdf#95376 DOCX import: fix
incorrectly indented tab stops, 2016-01-26), the same is necessary for
before text indent.

(cherry picked from commit c9dee880)

Change-Id: I11394881d116f76922c1a706dd14b6a7cdf3c89f
Reviewed-on: https://gerrit.libreoffice.org/45929Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

sw/qa/extras/rtfimport/data/tdf104016.rtf

+{\rtf1\ansi\ansicpg1252\deff0
+{\fonttbl
+{\f0\fnil\fcharset0\fprq0\fttruetype Times New Roman;}
+{\f1\fnil\fcharset0\fprq0\fttruetype Arial;}
+{\f2\fnil\fcharset0\fprq0\fttruetype Symbol;}
+}
+{\*\listtable
+{\list\listtemplateid1018\listsimple
+{\listlevel\levelnfc23\levelstartat1\levelspace0\levelfollow0\fi-360\li720
+{\leveltext\'01\'b7 ;}
+{\levelnumbers;}
+\f2}
+\listid1017}
+}
+{\*\listoverridetable
+{\listoverride\listoverridecount0\listid1017\levelnfc23\levelstartat1\levelspace0\levelfollow0\fi-360\li720
+{\leveltext\'01\'b7 ;}
+{\levelnumbers;}
+\f2\ls1}
+}
+\kerning0\cf0\ftnbj\fet2\ftnstart1\ftnnar\aftnnar\ftnstart1\facingp\titlepg
+\deftab720\viewkind1\paperw12240\paperh15840\margl1440\margr1440\widowctl
+\sectd\sbknone\colsx360\marglsxn1800\margrsxn1800\pgncont\ltrsect
+\pard\plain
+{\ltrpar\ql\fi-360\li720\s21\f0\fs24\lang1033
+\ls1\ilvl0\itap0\tx720
+{\f0\fs24\lang1033
+\ltrch hello}
+\par}
+}

sw/qa/extras/rtfimport/rtfimport.cxx

@@ -1364,6 +1364,15 @@ DECLARE_RTFIMPORT_TEST(testWatermark, "watermark.rtf")
     CPPUNIT_ASSERT_EQUAL(sal_Int32(aExpectedSize.Height()), aActualSize.Height);
 }
 
+DECLARE_RTFIMPORT_TEST(testTdf104016, "tdf104016.rtf")
+{
+    uno::Reference<beans::XPropertyState> xParagraph(getParagraph(1), uno::UNO_QUERY);
+    // This was beans::PropertyState_DIRECT_VALUE, leading to lack of
+    // interitance from numbering.
+    CPPUNIT_ASSERT_EQUAL(beans::PropertyState_DEFAULT_VALUE,
+                         xParagraph->getPropertyState("ParaLeftMargin"));
+}
+
 // tests should only be added to rtfIMPORT *if* they fail round-tripping in rtfEXPORT
 
 CPPUNIT_PLUGIN_IMPLEMENT();

writerfilter/source/dmapper/DomainMapper.cxx

@@ -1333,6 +1333,7 @@ void DomainMapper::sprmWithProps( Sprm& rSprm, const PropertyMapPtr& rContext )
                     // 4) Direct paragraph formatting: that will came later.
                     // So no situation where keeping indentation at this point would make sense -> erase.
                     rContext->Erase(PROP_PARA_FIRST_LINE_INDENT);
+                    rContext->Erase(PROP_PARA_LEFT_MARGIN);
                 }
             }
             else