tdf#146690: pptx export: fix endParaRPr size value for empty paragraphs

Fixes paragraphs made from a single new line, not getting the
correct sz(text size) value in EndParagraphRunProperties on pptx
export

Change-Id: I31ebb5735ad392e081aa2f43b0b60a845e4de9c2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/128265
Tested-by: Jenkins
Reviewed-by: Andras Timar <andras.timar@collabora.com>

oox/qa/unit/export.cxx

@@ -395,6 +395,27 @@ CPPUNIT_TEST_FIXTURE(Test, testReferToTheme)
                 "75000");
     assertXPath(pXmlDoc, "//p:sp[3]/p:txBody/a:p/a:r/a:rPr/a:solidFill/a:schemeClr/a:lumOff", 0);
 }
+
+CPPUNIT_TEST_FIXTURE(Test, testTdf146690_endParagraphRunPropertiesNewLinesTextSize)
+{
+    // Given a PPTX file that contains references to a theme:
+    OUString aURL
+        = m_directories.getURLFromSrc(DATA_DIRECTORY) + "endParaRPr-newline-textsize.pptx";
+
+    // When saving that document:
+    loadAndSave(aURL, "Impress Office Open XML");
+
+    std::unique_ptr<SvStream> pStream = parseExportStream(getTempFile(), "ppt/slides/slide1.xml");
+    xmlDocUniquePtr pXmlDoc = parseXmlStream(pStream.get());
+    // Then make sure the shape text color is a scheme color:
+    // Without the accompanying fix in place, this test would have failed with:
+    // - Expected: 500
+    // - Actual  : 1800
+    // i.e. the endParaRPr 'size' wasn't exported correctly
+    assertXPath(pXmlDoc, "//p:sp[1]/p:txBody/a:p[1]/a:endParaRPr", "sz", "500");
+    assertXPath(pXmlDoc, "//p:sp[1]/p:txBody/a:p[2]/a:endParaRPr", "sz", "500");
+    assertXPath(pXmlDoc, "//p:sp[1]/p:txBody/a:p[3]/a:endParaRPr", "sz", "500");
+}
 }
 
 CPPUNIT_PLUGIN_IMPLEMENT();

oox/source/export/drawingml.cxx

@@ -3142,7 +3142,11 @@ void DrawingML::WriteParagraph( const Reference< XTextContent >& rParagraph,
                 Reference< XPropertySet > xFirstRunPropSet (run, UNO_QUERY);
                 Reference< XPropertySetInfo > xFirstRunPropSetInfo = xFirstRunPropSet->getPropertySetInfo();
                 if( xFirstRunPropSetInfo->hasPropertyByName("CharHeight") )
+                {
                     fFirstCharHeight = xFirstRunPropSet->getPropertyValue("CharHeight").get<float>();
+                    rnCharHeight = 100 * fFirstCharHeight;
+                    rbOverridingCharHeight = true;
+                }
                 WriteParagraphProperties(rParagraph, fFirstCharHeight, XML_pPr);
                 bPropertiesWritten = true;
             }