https://bugs.documentfoundation.org/show_bug.cgi?id=161072

            Bug ID: 161072
           Summary: Character dialog's preview for Transparency font
                    effect does not update on value change
           Product: LibreOffice
           Version: 7.0.0.3 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: bibisected, bisected, implementationError
          Severity: minor
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]
            Blocks: 107657

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?


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=107657
[Bug 107657] [META] Font effects bugs and enhancements
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