fdo#38542: SvxBorderLine::GuessLinesWidths:

Importing style:border-line-width="0.002cm 0.088cm 0.141cm" (which older
OOo/LO apparently could write) fails, because GuessLinesWidths can't find
a matching style (result: standard "double" border, 3 equal width parts).
Try to create a custom BorderWidthImpl of type DOUBLE instead, that
preserves the individual widths.

editeng/qa/items/borderline_test.cxx

@@ -106,7 +106,7 @@ void BorderLineTest::testGuessWidthNoMatch()
     line.GuessLinesWidths( DOUBLE,
             TEST_WIDTH + 1, TEST_WIDTH + 2, TEST_WIDTH + 3 );
     CPPUNIT_ASSERT_EQUAL( DOUBLE, line.GetStyle() );
-    CPPUNIT_ASSERT_EQUAL( long( 0 ), line.GetWidth() );
+    CPPUNIT_ASSERT_EQUAL( long( (3 * TEST_WIDTH) + 6 ), line.GetWidth() );
 }
 
 void BorderLineTest::testGuessWidthThinthickSmallgap()

editeng/source/items/borderline.cxx

@@ -277,12 +277,27 @@ void SvxBorderLine::GuessLinesWidths( SvxBorderStyle nStyle, sal_uInt16 nOut, sa
 
         // If anything matched, then set it
         if ( nWidth > 0 )
+        {
             nStyle = nTestStyle;
-
             SetStyle( nStyle );
             m_nWidth = nWidth;
         }
         else
+        {
+            // fdo#38542: not a known double, default to something custom...
+            SetStyle( nStyle );
+            m_nWidth = nOut + nIn + nDist;
+            if (nOut + nIn + nDist)
+            {
+                m_aWidthImpl = BorderWidthImpl(
+                    CHANGE_LINE1 | CHANGE_LINE2 | CHANGE_DIST,
+                    static_cast<double>(nOut ) / static_cast<double>(m_nWidth),
+                    static_cast<double>(nIn  ) / static_cast<double>(m_nWidth),
+                    static_cast<double>(nDist) / static_cast<double>(m_nWidth));
+            }
+        }
+    }
+    else
     {
         SetStyle( nStyle );
         m_nWidth = m_aWidthImpl.GuessWidth( nOut, nIn, nDist );