[Libreoffice-bugs] [Bug 142811] New: UI: Ruler grid inaccurate for tabstops in metric units

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=142811

            Bug ID: 142811
           Summary: UI: Ruler grid inaccurate for tabstops in metric units
           Product: LibreOffice
           Version: 7.1.3.2 release
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: minor
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: mail2.0 at gmx.de

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

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