Created attachment 170857 [details]
Example file from PowerPoint
Attached user-made presentation has a circle shape on its master slide.
Impress opens it with shadowing set, but it has no shadow set in PP.
Steps to reproduce:
1. Open attached document
Dark circle is visible on the right side of the slide.
The circle shape should be transparent.
Version: 18.104.22.168.alpha0+ (x64) / LibreOffice Community
Build ID: 6b3f0866e9eddd5553857741862ca0d7d5b2ec2b
CPU threads: 4; OS: Windows 10.0 Build 18363; UI render: Skia/Raster; VCL: win
Locale: en-US (hu_HU); UI: en-US
In 7.1 the problem became very visible, but the extra shadow effect was enabled before in 6.0, 5.0, 4.1 but not yet in 4.0.
Bibisected using bibisect-win64-7.1 to:
author A_GAN <firstname.lastname@example.org> Mon Jun 08 21:36:34 2020 +0200
committer Tomaž Vajngerl <email@example.com> Mon Jun 15 11:55:53 2020 +0200
Add process function to create the blur shadow
This part may be related to bug #136787 which was also bibisected to this commit.
Still setting bibisectrequest for the appearance of shadow in 4.1
Created attachment 170858 [details]
Screenshot of the original document side by side in PowerPoint and Impress
Version: 22.214.171.124.alpha0+ / LibreOffice Community
Build ID: c088d26578d1be352efa49bd164a8217627648de
CPU threads: 4; OS: Linux 5.7; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
bibisected the appearance of shadow setting with bibisect-41max to:
author Radek Doulik <firstname.lastname@example.org> 2012-12-11 15:35:43 +0100
use effect references
Created attachment 170909 [details]
Screenshot from 126.96.36.199
(In reply to NISZ LibreOffice Team from comment #0)
> In 7.1 the problem became very visible, but the extra shadow effect was
> enabled before in 6.0, 5.0, 4.1 but not yet in 4.0.
> Still setting bibisectrequest for the appearance of shadow in 4.1
I'm not sure what kind of difference to look for in 4.0 vs. 4.1, I'm seeing the very faint circular shadow in both versions. Attaching a screenshot from 188.8.131.52, an even earlier version, which also has the shadow.
Created attachment 171123 [details]
The example file in 4.0 vs 4.1
In old versions the difference was only visible in the Area dialog - Shadow tab.
Left is 4.0 right is 4.1.
Open attachment 154750 [details] from bug 105695 is also affected by this issue
The oval-shape has still shadow enabled, but there is no shadow rendered.
Tested with Version: 184.108.40.206.alpha1+ (X86_64) / LibreOffice Community
Build ID: 70fd835b4cf75e386ee115c705241a4059fb68a8
CPU threads: 8; OS: Windows 10.0 Build 19045; UI render: default; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL threaded