[JimmyLiuJia]

Sorting worksheets after one or more sheets have been finished can attach a worksheet name to another sheet's cells, tab color and comments. A mix of finished and unfinished sheets can also create duplicate ZIP parts, producing an unreadable workbook.

Assign each worksheet a stable part index when it is created, and use its current tab position for the active tab and worksheet-scoped defined names. Add POI round-trip regressions for zero, one and all three sheets finished before sorting, checking sheet order and content, colors, comments, active sheet, repeating titles, autofilters and local named ranges.

Fixes #533.

Validation:

• Reproduced the finish-before-sort scenario from Sorting Workbook with sortWorksheets is not reordinging colors #533's comment using the same three sheet names, colors and values; the original source misassigned sheet content, and the patched source preserved it.
• Two of the three new regression cases fail against the original source; all three pass with the fix.
• mvn -B -ntp clean verify jacoco:report on JDK 11: 203 tests, zero failures, errors or skips.

AI disclosure: OpenAI Codex assisted with the implementation and tests. The validation results above were obtained locally.