https://bugs.documentfoundation.org/show_bug.cgi?id=172721

            Bug ID: 172721
           Summary: Calc: Page Break Preview rendering corrupted (cells
                    drawn at wrong positions, duplicated fragments, broken
                    page-number watermark) when UI language is Chinese
                    (zh-TW or zh-CN)
           Product: LibreOffice
           Version: 26.2.4.2 release
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 207669
  --> https://bugs.documentfoundation.org/attachment.cgi?id=207669&action=edit
Comparison screenshot: same document in Page Break Preview — English UI
(correct) vs Chinese UI (corrupted)

When the UI language is set to Chinese (tested both Traditional zh-TW and
Simplified zh-CN), switching a spreadsheet to Page Break Preview (View > Page
Break) corrupts the rendering: cell contents are drawn at wrong positions,
parts of the sheet are duplicated at a wrong offset, and the "第 1 頁"
page-number watermark is only partially rendered.

The same document renders correctly in Page Break Preview when the UI language
is English (US) — even with Asian language support enabled and default Asian
language set to Chinese (Traditional). The trigger is the UI language itself,
which points to the CJK watermark string / UI font path used when drawing the
page preview.

Steps to Reproduce:
1. Install LibreOffice 26.2.4.2 on Windows with Chinese (Traditional) UI; Tools
> Options > Languages and Locales > General > User interface = Chinese
(Traditional); restart
2. Create a new blank Calc spreadsheet, enter values in a few cells
3. View > Page Break (檢視 > 分頁模式)

Actual Results:
Cell contents scattered / drawn at wrong positions, duplicated sheet fragments
at wrong offsets, page-number watermark broken.

Expected Results:
Same rendering as with English UI: zoomed-out page layout with intact "Page 1"
watermark.

Additional Information:
Reproduced with ALL of the following, so not Skia-, profile-, or
document-specific:
- Skia enabled (UI render: Skia/Raster) AND Skia disabled (GDI)
- Safe Mode
- Brand-new blank document
- Both zh-TW and zh-CN UI languages

NOT reproducible with English UI + Asian language support enabled (Default
Asian language = Chinese Traditional), i.e. the CJK document layout path is
fine; only a CJK UI language triggers it.

Screenshots attached: English UI vs Chinese UI, same document.

Version: 26.2.4.2 (X86_64)
Build ID: 0229ac93fcf0d7cbc6376066c6f35021cef002dc
CPU threads: 16; OS: Windows 10 X86_64 (build 19045); UI render: Skia/Raster;
VCL: win
Locale: zh-TW (en_US); UI: zh-TW
Calc: threaded

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