Bug 161072 - Character dialog's preview for Transparency font effect does not update on value change
Summary: Character dialog's preview for Transparency font effect does not update on va...
Status: UNCONFIRMED
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
Version:
(earliest affected)
7.0.0.3 release
Hardware: All All
: medium minor
Assignee: Not Assigned
URL:
Whiteboard: QA:needsComment
Keywords: bibisected, bisected, implementationError
Depends on:
Blocks: Font-Effects
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Reported: 2024-05-14 12:50 UTC by Stéphane Guillou (stragu)
Modified: 2024-05-29 03:15 UTC (History)
2 users (show)

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Description Stéphane Guillou (stragu) 2024-05-14 12:50:17 UTC 
Steps:
1. Open Writer
2. Write some text
3. Select some text, apply a font colour that's not Automatic (to avoid bug 139751)
4. Format > Character > Font Effects
5. Change Transparency value to a high value, e.g. 70% (so a change would be noticeable)
6. Press Tab to make sure the change registers
7. Change tab in the dialog

Result: the preview does not update to show the transparency. On Linux, it only updates after moving to a different dialog tab.

Expected: the preview should update as soon as the value changes, just like it does when changing e.g. the Font color in the same tab, or the Scale width in the Position tab, of the Font size in the Font tab, etc.

Version: 24.8.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 9b41d33a00763bebd5fc70787052222d35a98a52
CPU threads: 4; OS: Windows 11 (10.0 build 22631); UI render: Skia/Raster; VCL: win

Already the case on 7.0 at Miklos' 5202771939da66ac85ca3221d69e7e5f5cca8da7.

On Linux, before commit 30bc5fdb49621269b7281aace610ca85b150766c, preview would never show transparency; but since 24.2 and commit 30bc5fdb49621269b7281aace610ca85b150766c, preview updates when changing tabs:

commit 30bc5fdb49621269b7281aace610ca85b150766c
author	Caolán McNamara	Wed Jun 07 19:50:50 2023 +0100
committer	Caolán McNamara	Fri Jun 09 12:44:38 2023 +0200
Related: CollaboraOnline#6511 cairo backend can do transparent text
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/152719

Caolán, given that your commit slightly improved things on Linux, any thoughts?