Link to issue number:

Fixes #18231

Summary of the issue:

Previously, JABTextInfo's _getParagraphOffsets used its own _getLineOffsets to obtain paragraph offsets, which resulted in only the line under the mouse being reported in the paragraph mouse text unit.

Description of user facing changes:

Now report the paragraph under the mouse.

Description of developer facing changes:

JABTextInfo obtains the correct offset for the paragraph.

Description of development approach:

• The _getStoryText method has been added to JABTextInfo so that OffsetsTextInfo._getLineOffsets can work.
• JABTextInfo._getParagraphOffsets now uses the superclass _getLineOffsets to calculate offsets based on text content.

Testing strategy:

This PR only affects cases where the mouse text unit is a paragraph.

Run TextComponentDemo.java to test.

Manual testing:

1. Report the entire paragraph when the mouse is over a multi-line paragraph.
2. Enter some text on the last line, and report the text just entered when the mouse is on the last line.
3. When the last line is empty, the mouse reports the contents of the penultimate line and its paragraph on the last line. Similar to Nvda repeats the penultimate line of a text in a java application when the last line is empty #9376, no regression was introduced.

Known issues with pull request:

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.

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