Keep the formatting of runs (#259)

As in 25ecd54 runs were created
anew on text replacement, previous
formatting was not preserved.
To fix this, the text of the first run
is now set to "", and the replacement
text is inserted

build.gradle

@@ -8,7 +8,7 @@ plugins {
 }
 
 group 'com.docutools'
-version = '4.2.5'
+version = '4.2.6'
 
 java {
     toolchain {

src/main/java/com/docutools/jocument/impl/word/WordUtilities.java

@@ -61,12 +61,20 @@ public static String toString(XWPFParagraph paragraph) {
   public static void replaceText(XWPFParagraph paragraph, String newText) {
     String[] lines = newText.split("(\\r\\n|\\r|\\n)");
     List<XWPFRun> runs = paragraph.getRuns();
+    XWPFRun run = runs.isEmpty() ? paragraph.createRun() : runs.get(0);
+    removeRunText(run);
+    insertLines(lines, run);
     // When deleting a run from a paragraph, the collection keeping the runs shrinks to fit to the new size
     // If we delete the runs with indices 1,2,3...,x,  the second half of the delete operations fails silently
     // To avoid this, we simply delete the first run x times.
-    IntStream.range(0, runs.size()).forEach(value -> paragraph.removeRun(0));
-    XWPFRun run = paragraph.createRun();
-    insertLines(lines, run);
+    IntStream.range(1, runs.size()).forEach(value -> paragraph.removeRun(0));
+  }
+
+  private static void removeRunText(XWPFRun run) {
+    int sizeOfTextArray = run.getCTR().sizeOfTArray();
+    for (int i = 0; i < sizeOfTextArray; i++) {
+      run.setText("", i);
+    }
   }
 
   private static void insertLines(String[] lines, XWPFRun run) {