kamilkrzywanski opened a new pull request, #1189:
URL: https://github.com/apache/poi/pull/1189

   When chart data is built with `fromNumericCellRange` and then `plot()` is 
called, the series format code in the chart `numCache` was left empty (and any 
existing format was cleared). PowerPoint then shows unformatted data labels if 
they are linked to source, until the embedded workbook is opened in Excel and 
the cache is refreshed.
   
   This change reads number formats from the cells, uses the first non-blank 
numeric cell as the series format, and writes a per-point format when it 
differs. `setFormatCode(...)` still overrides the series format. Includes a 
regression test.
   
   Fixes #1007


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