FOP-2855: apply patch from Juan for fixing letter spacing of spaces inside white-space=pre text

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1863872 13f79535-47bb-0310-9956-ffa450edef68

Author: matthias8283

fop-core/src/main/java/org/apache/fop/layoutmgr/inline/TextLayoutManager.java

@@ -844,8 +844,15 @@ public List getNextKnuthElements(final LayoutContext context, final int alignmen
                 font.mapChar(ch);
                 // preserved space or non-breaking space:
                 // create the GlyphMapping object
-                mapping = new GlyphMapping(nextStart, nextStart + 1, 1, 0, wordSpaceIPD, false, true,
-                                        breakOpportunity, spaceFont, level, null);
+                MinOptMax areaIPD;
+                if (prevMapping != null && prevMapping.isSpace) {
+                    areaIPD = wordSpaceIPD.minus(letterSpaceIPD);
+                } else {
+                    areaIPD = wordSpaceIPD;
+                }
+
+                mapping = new GlyphMapping(nextStart, nextStart + 1, 1, 0, areaIPD, false, true,
+                        breakOpportunity, spaceFont, level, null);
                 thisStart = nextStart + 1;
             } else if (CharUtilities.isFixedWidthSpace(ch) || CharUtilities.isZeroWidthSpace(ch)) {
                 // create the GlyphMapping object

fop/test/layoutengine/standard-testcases/block_letter-spacing_white-space_pre.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<testcase>
+  <info>
+    <p>
+      This test checks block level letter-spacing when having white-spaces.
+    </p>
+  </info>
+  <fo>
+    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
+      <fo:layout-master-set>
+        <fo:simple-page-master master-name="A4" page-height="297mm" page-width="210mm" margin="20mm">
+          <fo:region-body/>
+        </fo:simple-page-master>
+      </fo:layout-master-set>
+      <fo:page-sequence master-reference="A4">
+        <fo:flow flow-name="xsl-region-body">
+          <fo:block letter-spacing="0.5pt" white-space="pre">A A A A A A A A x<fo:inline font-size="70%" vertical-align="top">2</fo:inline></fo:block>
+          <fo:block letter-spacing="0.5pt" white-space="pre">A A A A         x<fo:inline font-size="70%" vertical-align="top">2</fo:inline></fo:block>
+          <fo:block letter-spacing="0.5pt" white-space="pre">                x<fo:inline font-size="70%" vertical-align="top">2</fo:inline></fo:block>
+        </fo:flow>
+      </fo:page-sequence>
+    </fo:root>
+  </fo>
+  <checks>
+    <eval expected="105220" xpath="//flow/block[1]/lineArea/text/@ipd"/>
+    <eval expected="86548" xpath="//flow/block[2]/lineArea/text/@ipd"/>
+    <eval expected="68376" xpath="//flow/block[3]/lineArea/text/@ipd"/>
+  </checks>
+</testcase>