Bug 156362 - FILEOPEN PPTX: connector lines show much thinner / fainter than in Office 365
Summary: FILEOPEN PPTX: connector lines show much thinner / fainter than in Office 365
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Printing and PDF export (show other bugs)
Version:
(earliest affected)
6.0.0.3 release
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: Connectors
  Show dependency treegraph
 
Reported: 2023-07-18 22:38 UTC by Gerald Pfeifer
Modified: 2025-08-06 13:54 UTC (History)
4 users (show)

See Also:
Crash report or crash signature:


Attachments
Sample document (PPTX) (16.16 MB, application/vnd.openxmlformats-officedocument.presentationml.presentation)
2023-07-18 22:38 UTC, Gerald Pfeifer
Details
Screenshot - PowerPoint (2.25 MB, image/png)
2023-07-18 22:39 UTC, Gerald Pfeifer
Details
Screenshot - LibreOffice (2.54 MB, image/png)
2023-07-18 22:40 UTC, Gerald Pfeifer
Details
comparison between Office.com and LO 24.2, edit mode vs presentation (1.12 MB, application/vnd.oasis.opendocument.text)
2023-07-19 12:33 UTC, Stéphane Guillou (stragu)
Details
Visual comparison Office 365 online: edit mode vs presentation mode (230.20 KB, application/vnd.oasis.opendocument.text)
2023-07-20 06:20 UTC, Gerald Pfeifer
Details
Minimal example file from PP (25.11 KB, application/vnd.openxmlformats-officedocument.presentationml.presentation)
2025-08-06 13:42 UTC, Gabor Kelemen (allotropia)
Details
The example file in PP and Impress side by side - OK (87.13 KB, image/png)
2025-08-06 13:43 UTC, Gabor Kelemen (allotropia)
Details
The example file in slideshow mode under Linux (left) and Windows (right) (18.12 KB, image/png)
2025-08-06 13:54 UTC, Gabor Kelemen (allotropia)
Details

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Description Gerald Pfeifer 2023-07-18 22:38:53 UTC
Created attachment 188451 [details]
Sample document (PPTX)

1. Open the attached sample document.
2. Observe how the four vertical lines on the first slide appear much
   more faint and thinner (than in Office 365),
Comment 1 Gerald Pfeifer 2023-07-18 22:39:29 UTC
Created attachment 188452 [details]
Screenshot - PowerPoint
Comment 2 Gerald Pfeifer 2023-07-18 22:40:35 UTC
Created attachment 188453 [details]
Screenshot - LibreOffice
Comment 3 Stéphane Guillou (stragu) 2023-07-19 09:47:29 UTC
Testing with:

Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 77fca616e0bd79e0b405fd0b3543cf8e94e15df3
CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: threaded

I can see the difference in slideshow mode between LO and Office.com.

Same in LO 6.0.

Noting that the connectors are part of a group along with the rectangle that contains the text, e.g. Group 30. Ungrouping makes no difference.

The connector has a line width 0.02 cm in LO.
Maybe related to bug 92222?

Which version of LibreOffice are you using? Please paste the info copied from Help > About LibreOffice here.
Comment 4 Gerald Pfeifer 2023-07-19 10:53:00 UTC
(In reply to Stéphane Guillou (stragu) from comment #3)
> Which version of LibreOffice are you using?

Apologies for embarrassingly missing the obvious!

Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: aa5c3d32d7c85b496fa86d8198478fb6dc157811
CPU threads: 8; OS: Linux 6.4; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
Comment 5 Stéphane Guillou (stragu) 2023-07-19 12:32:16 UTC
Thank you.

Interestingly, the lines look as faint as in LO when in edit mode on Office.com. They are thicker only in presentation mode on Office.com.

- In OOo 3.3, they are thick in edit mode and presentation.
- In 6.0, they are thick in edit mode, faint in presentation.
- In 24.2, they are faint in both edit mode and presentation.

Was the file created in Office 365? If so, what is the width setting used for such a line?

And you said "vertical" but I assume you meant "horizontal"?

In the unpacked PPTX, ppt/slides/slide.xml, I find:

<p:cxnSp><p:nvCxnSpPr><p:cNvPr id="30" name="Straight Connector 29"><a:extLst><a:ext uri="{FF2B5EF4-FFF2-40B4-BE49-F238E27FC236}"><a16:creationId xmlns:a16="http://schemas.microsoft.com/office/drawing/2014/main" id="{6CC2BC97-EC44-4F93-9793-731B40AF63D7}"/></a:ext></a:extLst></p:cNvPr><p:cNvCxnSpPr><a:cxnSpLocks/></p:cNvCxnSpPr><p:nvPr/></p:nvCxnSpPr><p:spPr><a:xfrm><a:off x="7004376" y="7094428"/><a:ext cx="11612880" cy="0"/></a:xfrm><a:prstGeom prst="line"><a:avLst/></a:prstGeom><a:ln w="6350"><a:solidFill><a:srgbClr val="90BAE2"/></a:solidFill></a:ln></p:spPr><p:style><a:lnRef idx="1"><a:schemeClr val="accent1"/></a:lnRef><a:fillRef idx="0"><a:schemeClr val="accent1"/></a:fillRef><a:effectRef idx="0"><a:schemeClr val="accent1"/></a:effectRef><a:fontRef idx="minor"><a:schemeClr val="tx1"/></a:fontRef></p:style></p:cxnSp></p:grpSp>
Comment 6 Stéphane Guillou (stragu) 2023-07-19 12:33:57 UTC
Created attachment 188467 [details]
comparison between Office.com and LO 24.2, edit mode vs presentation

At least LO is consistent between edit mode and presentation...

Can you please provide a comparison of edit mode and presentation for Office 365 desktop?
Comment 7 Gerald Pfeifer 2023-07-20 05:44:53 UTC
(In reply to Stéphane Guillou (stragu) from comment #5)
> Was the file created in Office 365? If so, what is the width setting 
> used for such a line?

It's (part of) an older file I got from a third party who definitely
created it using Microsoft Office (more likely on a Mac than Windows).

> And you said "vertical" but I assume you meant "horizontal"?

Yes, those horizontal lines.
Comment 8 Gerald Pfeifer 2023-07-20 06:20:22 UTC
Created attachment 188488 [details]
Visual comparison Office 365 online: edit mode vs presentation mode

(In reply to Stéphane Guillou (stragu) from comment #6)
> Can you please provide a comparison of edit mode and presentation for
> Office 365 desktop?

I do not have access to Office 365 desktop, just the online version.
Which is similar for me in terms of the lines (- alas the icons do not
show up in edit mode).
Comment 9 Gabor Kelemen (allotropia) 2025-08-06 13:42:47 UTC
Created attachment 202209 [details]
Minimal example file from PP

I tried to see what is wrong here, so threw out the extra images, shapes, groups and only copied the horizontal line and set it different widths from 0.25 pt to 2.25 and different colors.

What I see after opening this in Impress and setting the measurement unit to points is that the PPTX import happens correctly, the Line dialog shows correct values, rounded to 1 digit (so 1.25 becomes 1.2, 1.75 becomes 1.7 etc). But that is just the UI, saving to PPTX keeps these and PP shows them as they were.

I'd say this is not a PPTX issue, but probably the slideshow engines limitation.
Comment 10 Gabor Kelemen (allotropia) 2025-08-06 13:43:34 UTC
Created attachment 202210 [details]
The example file in PP and Impress side by side - OK

Version: 26.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 7f4868348c14b305fcd75744e1e3544d0d3a5d61
CPU threads: 14; OS: Windows 10 X86_64 (build 19045); UI render: Skia/Raster; VCL: win
Locale: hu-HU (hu_HU); UI: en-US
Calc: threaded
Comment 11 Gabor Kelemen (allotropia) 2025-08-06 13:54:56 UTC
Created attachment 202211 [details]
The example file in slideshow mode under Linux (left) and Windows (right)

Under Linux, a recent-ish bibisect 25.8 repo shows thinner lines than the virtual Windows VM. Strange...

Version: 25.8.0.0.beta1+ (X86_64) / LibreOffice Community
Build ID: 211c193b1c7391b4f1c1172214a90899de19b06a
CPU threads: 16; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: en-US (hu_HU.UTF-8); UI: en-US
Calc: threaded