Fix XWPFDocument FindAndReplaceTextInParagraph

[Kazbek]

My first attempt to contribute to NPOI.
Trying to fix my issue from 2021 #666. Work well for demo with bug and also passing single test in repo (FindAndReplaceText method).

[tonyqus]

Please add at least one unit test for this fix.

[Kazbek]

Added test which cover bug demo case and a bit more variations.

[Kazbek]

I'm just realized that this method will not work when there are more than 2 occurance of replace text in paragraph. Will modify code and test for it. Idk if original method handle this or not.

[Kazbek]

Now must work properly.

[tonyqus]

Btw, where are you from?

[Kazbek]

Russia

[tonyqus]

Unit tests failed. Please fix them

[Kazbek]

I screwed up a bit with the number of commits. The tests passed successfully on my computer. But as I understood, the error was that the text contained foreign characters, and the file was not in utf8 encoding. If you want I can make new PR with single commit.

[Kazbek]

Let me know if there's anything else you need me to do.

[Copilot]

Pull Request Overview

This PR addresses issue #666 by fixing the FindAndReplaceTextInParagraph functionality in XWPFDocument, as well as adding a test case to validate the replacement behavior.

• Fixes text replacement within paragraphs in XWPFDocument.
• Adds a new test case to verify that FindAndReplaceTextInParagraph works as expected.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
testcases/ooxml/XWPF/UserModel/TestXWPFDocument.cs	Added a new test case to validate the updated FindAndReplaceText functionality.
ooxml/XWPF/Usermodel/XWPFDocument.cs	Updated the FindAndReplaceTextInParagraph internal method to support recursive replacements using an additional parameter.

Comments suppressed due to low confidence (1)

ooxml/XWPF/Usermodel/XWPFDocument.cs:1895

• [nitpick] The variable 'firstParagraph' (and similarly 'lastParagraph') may be misleading as it actually represents a run index rather than a paragraph index. Consider renaming them to 'firstRunIndex' and 'lastRunIndex' for improved clarity.

int firstParagraph = -1;

[Copilot]

Duplicate assignment to outputDocument detected. Please remove the redundant assignment to ensure clarity.

Suggested change

	XWPFDocument outputDocument = outputDocument = XWPFTestDataSamples.WriteOutAndReadBack(doc);
	XWPFDocument outputDocument = XWPFTestDataSamples.WriteOutAndReadBack(doc);

[tonyqus]

Can you help solve the conflict?

[tonyqus]

Wow, copilot review..... awesome!

[Kazbek]

Solved conflict and applied copilot suggestions.

[tonyqus]

LGTM