Bug 142811

Summary:	UI: Ruler grid inaccurate for tabstops in metric units
Product:	LibreOffice	Reporter:	mail2.0
Component:	Writer	Assignee:	Not Assigned <libreoffice-bugs>
Status:	RESOLVED WORKSFORME
Severity:	minor	CC:	dgp-mail
Priority:	medium
Version:	7.1.3.2 release
Hardware:	x86-64 (AMD64)
OS:	Windows (All)
Whiteboard:
Crash report or crash signature:		Regression By:
Bug Depends on:
Bug Blocks:	107834, 108629

Description mail2.0 2021-06-11 22:22:59 UTC

Description:
When placing a tabstop on the ruler with the mouse, it snaps into the nearest grid point. However, using Centimeter as measuring unit causes unexpected deviations of +- 0,01 cm from the regular grid positions, which can be detected in the Paragraph > Tabs dialog view.

Steps to Reproduce:
1. Open a new text-document
2. Make sure to use Centimeter as Measurement Unit in Tools > Options > LibreOffice Writer > General
3. Also use Centimeters with the ruler: right-click on the ruler and select "Centimeter" from the context menu
4. Choose Paper Format "A4" in Format > Page Style...
5. Set View > Zoom > 100% (only full- and half- cm tick marks should be visible on the ruler)
6. By clicking and dragging the mouse on the ruler, place a tabstop at the 16 cm tick mark
7. Check the location of tabstops in the Format > Paragraph > Tabs dialog.

Actual Results:
Position of the tabstop is shown to be 16,01 cm

Expected Results:
Tabstop should be placed at exactly 16,00 cm


Reproducible: Always


User Profile Reset: No



Additional Info:
Workaround: Zoom in more or use the Paragraph > Tabs dialog.

The behaviour was also observed in different units (e.g. milimeters), at various zoom-levels and with other tabstop positions (not too small).

Suspecting a unit-conversion/rounding/floating point error.


Tested on monitor with DPI scaling 100% (72 DPI).

Version: 7.1.3.2 (x64) / LibreOffice Community
Build ID: 47f78053abe362b9384784d31a6e56f8511eb1c1
CPU threads: 4; OS: Windows 10.0 Build 19042; UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: en-US
Calc: threaded

Comment 1 Dieter 2021-06-29 13:23:13 UTC

I confirm it with

Version: 7.3.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: 949658028e722e5d2657b503eb20e16e41dbd8cf
CPU threads: 4; OS: Windows 10.0 Build 19043; UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: en-GB
Calc: CL

Comment 2 QA Administrators 2023-06-30 03:13:33 UTC Comment hidden (obsolete)

Dear mail2.0,

To make sure we're focusing on the bugs that affect our users today, LibreOffice QA is asking bug reporters and confirmers to retest open, confirmed bugs which have not been touched for over a year.

There have been thousands of bug fixes and commits since anyone checked on this bug report. During that time, it's possible that the bug has been fixed, or the details of the problem have changed. We'd really appreciate your help in getting confirmation that the bug is still present.

If you have time, please do the following:

Test to see if the bug is still present with the latest version of LibreOffice from https://www.libreoffice.org/download/

If the bug is present, please leave a comment that includes the information from Help - About LibreOffice.

If the bug is NOT present, please set the bug's Status field to RESOLVED-WORKSFORME and leave a comment that includes the information from Help - About LibreOffice.

Please DO NOT

Update the version field
Reply via email (please reply directly on the bug tracker)
Set the bug's Status field to RESOLVED - FIXED (this status has a particular meaning that is not
appropriate in this case)

If you want to do more to help you can test to see if your issue is a REGRESSION. To do so:
1. Download and install oldest version of LibreOffice (usually 3.3 unless your bug pertains to a feature added after 3.3) from https://downloadarchive.documentfoundation.org/libreoffice/old/

2. Test your bug
3. Leave a comment with your results.
4a. If the bug was present with 3.3 - set version to 'inherited from OOo';
4b. If the bug was not present in 3.3 - add 'regression' to keyword

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Thank you for helping us make LibreOffice even better for everyone!

Warm Regards,
QA Team

MassPing-UntouchedBug

Comment 3 Dieter 2023-07-29 09:51:17 UTC

Can't confirm with

Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 42f0422d19c4d0a2fb09654fb6d1d92e50f6dd5c
CPU threads: 4; OS: Windows 10.0 Build 19045; UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: en-GB
Calc: CL threaded

=> RESOLVED WORKSFORME