https://bugs.documentfoundation.org/show_bug.cgi?id=172028

            Bug ID: 172028
           Summary: [26.8 CJK Vertical] Text in vertical mode textbox
                    becomes invisible (kf/qt)
           Product: LibreOffice
           Version: 26.8.0.0 alpha0+ master
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]

Description:
Text in vertical mode textbox becomes invisible.

Steps to Reproduce:
1. Open new Writer.
2. Insert textbox, and change it to vertical mode.
3. Double-clicking the textbox.

Actual Results:
4. Text in textbox will disappear.

Expected Results:
4. No changes will be observed.


Reproducible: Always


User Profile Reset: No

Additional Info:

This issue can be reproduced on Linux-OS (kf/qt). 
On Linux-OS (gen) it sometimes disappears, but is quickly redrawn.
Neither Windows nor Linux-OS (gtk) exhibited this bug.

Reproducible in
[2026-05-09]
Version: 26.8.0.0.alpha0+ (X86_64)
Build ID: 317bc2f248c92857058af5ed71bf72872b3dab5d
CPU threads: 2; OS: Linux 6.12; UI render: default; VCL: kf5 (cairo+xcb)
Locale: ja-JP (ja_JP.UTF-8); UI: en-US
Calc: threaded

Reproducible in
[2026-05-09]
Version: 26.8.0.0.alpha0+ (X86_64)
Build ID: 317bc2f248c92857058af5ed71bf72872b3dab5d
CPU threads: 2; OS: Linux 6.12; UI render: default; VCL: qt5 (cairo+xcb)
Locale: ja-JP (ja_JP.UTF-8); UI: en-US
Calc: threaded

Reproducible in
[2026-04-30]
Version: 26.8.0.0.alpha0+ (X86_64)
Build ID: b1e601a83dc811319353499f023a11ecb710f8e5
CPU threads: 2; OS: Linux 6.12; UI render: default; VCL: kf5 (cairo+xcb)
Locale: ja-JP (ja_JP.UTF-8); UI: en-US
Calc: threaded

---
Not reproducible in
[2026-05-09]
Version: 26.8.0.0.alpha0+ (X86_64)
Build ID: 317bc2f248c92857058af5ed71bf72872b3dab5d
CPU threads: 2; OS: Linux 6.12; UI render: default; VCL: gtk3
Locale: ja-JP (ja_JP.UTF-8); UI: en-US
Calc: threaded

Not reproducible in
[2026-04-20]
Version: 26.8.0.0.alpha0+ (X86_64)
Build ID: 05f7513a5fec87296cfac298f5fd3bfd0e0fc4bb
CPU threads: 2; OS: Linux 6.12; UI render: default; VCL: kf5 (cairo+xcb)
Locale: ja-JP (ja_JP.UTF-8); UI: en-US
Calc: threaded

Not reproducible in
[2026-05-08]
Version: 26.8.0.0.alpha0+ (X86_64)
Build ID: ddbd78e13a92747a2d68c836237f922fa6a43884
CPU threads: 4; OS: Windows 11 X86_64 (build 26100); UI render: Skia/Raster;
VCL: win
Locale: ja-JP (ja_JP); UI: ja-JP
Calc: CL threaded

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