xmloff: tdf#96147: ODF export: fix duplicate fo:background-color

... attributes that happen if both CharHighlight and CharBackColor
properties are used, because the CharBackTransparent property wasn't
taken into account, and combining the CharBackColor and
CharBackTransparent properties happens *after*
XMLTextExportPropertySetMapper::ContextFilter() runs.

Also, it looks like a transparent highlight wouldn't export properly but
apparently DomainMapper::getColorFromId() won't create such.

(regression from f880962f5bf26bfaef06bd3f9e67e2d901a2e74c)

Change-Id: Ib628ef8bb377482f74fadb97c81afb95fbbf7184

2 files changed, 12 insertions, 2 deletions

diff --git a/xmloff/source/text/txtexppr.cxx b/xmloff/source/text/txtexppr.cxx
index 35a63005a90b..6192bcf0a47f 100644
--- a/xmloff/source/text/txtexppr.cxx
+++ b/xmloff/source/text/txtexppr.cxx
@@ -669,6 +669,7 @@ void XMLTextExportPropertySetMapper::ContextFilter(
 
     // character background and highlight
     XMLPropertyState* pCharBackground = nullptr;
+    XMLPropertyState* pCharBackgroundTransparency = nullptr;
     XMLPropertyState* pCharHighlight = nullptr;
 
     bool bNeedsAnchor = false;
@@ -831,6 +832,7 @@ void XMLTextExportPropertySetMapper::ContextFilter(
             break;
 
         case CTF_CHAR_BACKGROUND: pCharBackground = propertyState; break;
+        case CTF_CHAR_BACKGROUND_TRANSPARENCY: pCharBackgroundTransparency = propertyState; break;
         case CTF_CHAR_HIGHLIGHT: pCharHighlight = propertyState; break;
         }
     }
@@ -1137,12 +1139,20 @@ void XMLTextExportPropertySetMapper::ContextFilter(
     // When both background attributes are available export the visible one
     if( pCharHighlight && pCharBackground )
     {
+        assert(pCharBackgroundTransparency); // always together
         sal_uInt32 nColor = COL_TRANSPARENT;
         pCharHighlight->maValue >>= nColor;
         if( nColor == COL_TRANSPARENT )
+        {
+            // actually this would not be exported as transparent anyway
+            // and we'd need another property CharHighlightTransparent for that
             pCharHighlight->mnIndex = -1;
+        }
         else
+        {
             pCharBackground->mnIndex = -1;
+            pCharBackgroundTransparency->mnIndex = -1;
+        }
     }
 
     SvXMLExportPropertyMapper::ContextFilter(bEnableFoFontFamily, rProperties, rPropSet);
diff --git a/xmloff/source/text/txtprmap.cxx b/xmloff/source/text/txtprmap.cxx
index 2cc88b1fa256..2d2728228ae4 100644
--- a/xmloff/source/text/txtprmap.cxx
+++ b/xmloff/source/text/txtprmap.cxx
@@ -192,7 +192,7 @@ XMLPropertyMapEntry aXMLParaPropMap[] =
     // TODO: not used?
     // RES_CHRATR_BACKGROUND
     MT_E( "CharBackColor",  FO, BACKGROUND_COLOR, XML_TYPE_COLORTRANSPARENT|MID_FLAG_MULTI_PROPERTY, CTF_CHAR_BACKGROUND ),
-    MT_E( "CharBackTransparent",    FO, BACKGROUND_COLOR, XML_TYPE_ISTRANSPARENT|MID_FLAG_MERGE_ATTRIBUTE, 0 ),
+    MT_E( "CharBackTransparent",    FO, BACKGROUND_COLOR, XML_TYPE_ISTRANSPARENT|MID_FLAG_MERGE_ATTRIBUTE, CTF_CHAR_BACKGROUND_TRANSPARENCY),
     MT_E( "CharBackColor",  FO, TEXT_BACKGROUND_COLOR, XML_TYPE_COLOR|MID_FLAG_SPECIAL_ITEM_EXPORT, CTF_OLDTEXTBACKGROUND ),
     // RES_CHRATR_CJK_FONT
     MT_ED( "CharFontNameAsian", STYLE,  FONT_NAME_ASIAN,            XML_TYPE_STRING|MID_FLAG_SPECIAL_ITEM_IMPORT, CTF_FONTNAME_CJK ),
@@ -535,7 +535,7 @@ XMLPropertyMapEntry aXMLTextPropMap[] =
     // TODO: not used?
     // RES_CHRATR_BACKGROUND
     MT_E( "CharBackColor",  FO, BACKGROUND_COLOR, XML_TYPE_COLORTRANSPARENT|MID_FLAG_MULTI_PROPERTY, CTF_CHAR_BACKGROUND ),
-    MT_E( "CharBackTransparent",    FO, BACKGROUND_COLOR, XML_TYPE_ISTRANSPARENT|MID_FLAG_MERGE_ATTRIBUTE, 0 ),
+    MT_E( "CharBackTransparent",    FO, BACKGROUND_COLOR, XML_TYPE_ISTRANSPARENT|MID_FLAG_MERGE_ATTRIBUTE, CTF_CHAR_BACKGROUND_TRANSPARENCY),
     { "CharShadingValue", sizeof("CharShadingValue")-1, XML_NAMESPACE_LO_EXT, XML_CHAR_SHADING_VALUE, XML_TYPE_NUMBER|XML_TYPE_PROP_TEXT, 0, SvtSaveOptions::ODFVER_012_EXT_COMPAT, false },
     MT_E( "CharBackColor",  FO, TEXT_BACKGROUND_COLOR, XML_TYPE_COLOR|MID_FLAG_SPECIAL_ITEM_EXPORT, CTF_OLDTEXTBACKGROUND ),
     // RES_CHRATR_CJK_FONT