Ods Comments With Newlines

Fix #4081. Ods Reader was not reading entire contents of comment. On further inspection, Ods Writer also was not handling comments completely correctly. Ods comments are recorded as `text:p` children of `office:annotation` elements. A newline is inserted between successive `text:p` elements. The `text:p` element itself can have as descendants (at least):
- raw text
- `text:span` elements
- `text:line-break` elements, which also causes the insertion of a newline

Ods Writer is changed to use a single `text:p` with multiple span/linebreak elements. Ods Reader is changed to process in their entirety either that form, or multiple `text:p` elements. Styling of the individual elements of the comment is permitted in Ods. That has not been supported till now by PhpSpreadsheet, and this PR will not address that situation - Ods Reader hast little style support, and this would hardly be the most urgent case where it is missing.

src/PhpSpreadsheet/Reader/Ods.php

@@ -436,14 +436,25 @@ class Ods extends BaseReader
 
                                 if ($annotation->length > 0 && $annotation->item(0) !== null) {
                                     $textNode = $annotation->item(0)->getElementsByTagNameNS($textNs, 'p');
+                                    $textNodeLength = $textNode->length;
+                                    $newLineOwed = false;
+                                    for ($textNodeIndex = 0; $textNodeIndex < $textNodeLength; ++$textNodeIndex) {
+                                        $textNodeItem = $textNode->item($textNodeIndex);
+                                        if ($textNodeItem !== null) {
+                                            $text = $this->scanElementForText($textNodeItem);
+                                            if ($newLineOwed) {
+                                                $spreadsheet->getActiveSheet()
+                                                    ->getComment($columnID . $rowID)
+                                                    ->getText()
+                                                    ->createText("\n");
+                                            }
+                                            $newLineOwed = true;
 
-                                    if ($textNode->length > 0 && $textNode->item(0) !== null) {
-                                        $text = $this->scanElementForText($textNode->item(0));
-
-                                        $spreadsheet->getActiveSheet()
-                                            ->getComment($columnID . $rowID)
-                                            ->setText($this->parseRichText($text));
-//                                                                    ->setAuthor( $author )
+                                            $spreadsheet->getActiveSheet()
+                                                ->getComment($columnID . $rowID)
+                                                ->getText()
+                                                ->createText($this->parseRichText($text));
+                                        }
                                     }
                                 }
 
@@ -731,6 +742,8 @@ class Ods extends BaseReader
             /** @var DOMNode $child */
             if ($child->nodeType == XML_TEXT_NODE) {
                 $str .= $child->nodeValue;
+            } elseif ($child->nodeType == XML_ELEMENT_NODE && $child->nodeName == 'text:line-break') {
+                $str .= "\n";
             } elseif ($child->nodeType == XML_ELEMENT_NODE && $child->nodeName == 'text:s') {
                 // It's a space
 

src/PhpSpreadsheet/Writer/Ods/Cell/Comment.php

@@ -24,7 +24,22 @@ class Comment
         $objWriter->writeAttribute('svg:x', $comment->getMarginLeft());
         $objWriter->writeAttribute('svg:y', $comment->getMarginTop());
         $objWriter->writeElement('dc:creator', $comment->getAuthor());
-        $objWriter->writeElement('text:p', $comment->getText()->getPlainText());
+
+        $objWriter->startElement('text:p');
+        $text = $comment->getText()->getPlainText();
+        $textElements = explode("\n", $text);
+        $newLineOwed = false;
+        foreach ($textElements as $textSegment) {
+            if ($newLineOwed) {
+                $objWriter->writeElement('text:line-break');
+            }
+            $newLineOwed = true;
+            if ($textSegment !== '') {
+                $objWriter->writeElement('text:span', $textSegment);
+            }
+        }
+        $objWriter->endElement(); // text:p
+
         $objWriter->endElement();
     }
 }

tests/PhpSpreadsheetTests/Reader/Ods/MultiLineCommentTest.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Ods;
+
+use PhpOffice\PhpSpreadsheet\Reader\Ods;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class MultiLineCommentTest extends AbstractFunctional
+{
+    public function testMultipleParagraphs(): void
+    {
+        $filename = 'tests/data/Reader/Ods/issue.4081.ods';
+        $reader = new Ods();
+        $spreadsheet = $reader->load($filename);
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame("First line.\n\nSecond line.", $sheet->getComment('A1')->getText()->getPlainText());
+        $spreadsheet->disconnectWorksheets();
+    }
+
+    public function testOneParagraphMultipleSpans(): void
+    {
+        $spreadsheetOld = new Spreadsheet();
+        $sheetOld = $spreadsheetOld->getActiveSheet();
+        $sheetOld->getCell('A1')->setValue('Hello');
+        $text = $sheetOld->getComment('A1')->getText();
+        $text->createText('First');
+        $text->createText(' line.');
+        $text->createText("\n");
+        $text->createText("\n");
+        $text->createText("Second line.\nThird line.");
+        $spreadsheet = $this->writeAndReload($spreadsheetOld, 'Ods');
+        $spreadsheetOld->disconnectWorksheets();
+
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame("First line.\n\nSecond line.\nThird line.", $sheet->getComment('A1')->getText()->getPlainText());
+        $spreadsheet->disconnectWorksheets();
+    }
+}