Resolves: fdo#58730 workaround [UL|LR]Space 100% problem

If all paragraph margins are 100% on import, ignore that as being the implicit
default. That avoids explicit 100% being set onto the awesome [UL|LR]Space
which takes a relative propsize of 100% as a flag that its value field is
absolute and so rejected by SwTxtFmtColl::Modify as a candidate for getting its
true value initialized relative to its parent, so it ends up as an absolute 0

Always elide the property on export because writing individual
margin-foos provides better backward compatibility with older versions
anyway.

Trigged by 3c5facfc

Change-Id: I55f6ceeae287b7d8e99befa4bd3cc06738a21299

xmloff/source/text/txtexppr.cxx

@@ -455,6 +455,8 @@ void XMLTextExportPropertySetMapper::ContextFilter(
     XMLPropertyState* pClip11State = NULL;
     XMLPropertyState* pClipState = NULL;
 
+    // filter fo:margin
+    XMLPropertyState* pAllParaMarginRel = NULL;
     XMLPropertyState* pAllParaMargin = NULL;
     XMLPropertyState* pAllMargin = NULL;
 
@@ -572,6 +574,7 @@ void XMLTextExportPropertySetMapper::ContextFilter(
         case CTF_NUMBERINGSTYLENAME:    pListStyleName = propertie; break;
         case CTF_TEXT_CLIP11:           pClip11State = propertie; break;
         case CTF_TEXT_CLIP:             pClipState = propertie; break;
+        case CTF_PARAMARGINALL_REL:     pAllParaMarginRel = propertie; break;
         case CTF_PARAMARGINALL:         pAllParaMargin = propertie; break;
         case CTF_MARGINALL:             pAllMargin = propertie; break;
         }
@@ -625,6 +628,11 @@ void XMLTextExportPropertySetMapper::ContextFilter(
     lcl_checkMultiProperty(pParaBottomMarginState, pParaBottomMarginRelState);
     lcl_checkMultiProperty(pParaFirstLineState, pParaFirstLineRelState);
 
+    if (pAllParaMarginRel)
+    {   // because older OOo/LO versions can't read fo:margin:
+        pAllParaMarginRel->mnIndex = -1; // just export individual attributes...
+        pAllParaMarginRel->maValue.clear();
+    }
     if (pAllParaMargin)
     {
         pAllParaMargin->mnIndex = -1; // just export individual attributes...

xmloff/source/text/txtimppr.cxx

@@ -257,6 +257,26 @@ void XMLTextImportPropertyMapper::FontDefaultsCheck(
     }
 }
 
+//fdo#58730 The [UL|LR]Space class has a deficiency where "100%" also serves as
+//a flag that the value is an absolute value so we can't truly handle an
+//up/lower space property which wants to specify its 200% upper but 100% lower
+//of its parent (try typing 100% vs 200% into the edit style dialog and revisit
+//your style). So on xml load that ends up meaning 200%, 0 lower. This is a
+//crock.
+//
+//On import clear 100% all-margins relative sizes.
+static bool
+isNotDefaultRelSize(const XMLPropertyState* pRelState, const UniReference<XMLPropertySetMapper>& rPrMap)
+{
+    if (rPrMap->GetEntryContextId(pRelState->mnIndex) == CTF_PARAMARGINALL_REL)
+    {
+        sal_Int32 nTemp = 0;
+        pRelState->maValue >>= nTemp;
+        return nTemp != 100;
+    }
+    return true;
+}
+
 void XMLTextImportPropertyMapper::finished(
             ::std::vector< XMLPropertyState >& rProperties,
             sal_Int32 /*nStartIndex*/, sal_Int32 /*nEndIndex*/ ) const
@@ -425,7 +445,8 @@ void XMLTextImportPropertyMapper::finished(
 
     for (sal_uInt16 i = 0; i < 4; i++)
     {
-        if (pAllParaMargin && !pParaMargins[i])
+        if (pAllParaMargin && !pParaMargins[i]
+            && isNotDefaultRelSize(pAllParaMargin, getPropertySetMapper()))
         {
 #if OSL_DEBUG_LEVEL > 0
             sal_Int16 nTmp = getPropertySetMapper()->GetEntryContextId(