Bug 128055 - OPTIONS DIALOG: Impossibility to assign a precise tab stop and other values in mm
Summary: OPTIONS DIALOG: Impossibility to assign a precise tab stop and other values i...
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
(earliest affected) release
Hardware: x86-64 (AMD64) Windows (All)
: medium normal
Assignee: Not Assigned
Depends on:
Blocks: Paragraph-Tab-Stops Measurement-Units Options-Dialog-Writer
  Show dependency treegraph
Reported: 2019-10-09 17:28 UTC by Ivan
Modified: 2023-11-01 10:59 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:


Note You need to log in before you can comment on or make changes to this bug.
Description Ivan 2019-10-09 17:28:51 UTC
Options -> LibreOffice Writer -> General

1. When I change measurement units from inches to millimeters, I can't immediately (without closing the Options window) change tab stops from 5.08 mm to 5.00 mm because it restores 5.08 mm.

In addition, if I change the units without closing-reopening the window, on Table page I see inches instead millimeters. But when I set millimeters on General page, close and reopen the window, I see millimeters on Table page too.

2. When I change measurement units, close the Options window and reopen it, I can change the tab stop what I want. But if I set 5.00 mm, close and reopen the window, I see 4.99 mm instead 5.00 mm. Such problem is for Grid and Table pages too. It seems there are some problems with rounding floating-point numbers when they must be displayed, and this is annoying.

I set "trivial" severity because it seems this problem is annoying but no more, and it doesn't affect on real working process with Writer.

Steps to Reproduce:
1. Open Options window when inches are default measurement units.

2. Change the units on Options -> LibreOffice Writer -> General and try to change immediately (without closing the window) tab stops: they will be restored automatically from 5.00 to 5.08 mm when Apply button is pressed.

3. See Table page where will be inches instead millimeters although millimeters were been set already.

4. Close Options window and reopen it.

5. Try to change tab stops to 5.00 mm, close and reopen the window. It is possible to play with Grid and Table pages too (5.00 mm will be replaced with 4.99 mm, 50.00 mm - with 50.01 mm etc when you close and reopen the window).

Actual Results:
1. It is impossible to set values immediately after changing from inches to mm.
2. For some values I see incorrectly rounded values which have 0.01 mm difference from values what I set.

Expected Results:
1. When a user changes the measurement units this changing must work immediately on all pages of Options window, not only after closing and reopening the window.

2. A user must see exactly that values which were been set. Real accuracy of floating-point numbers is sufficient for such values, but it is necessary to round them correctly taking into account that "real" numbers are binary but displayed numbers are decimal.

Reproducible: Always

User Profile Reset: No

OpenGL enabled: Yes

Additional Info:
Comment 1 Dieter 2019-10-10 07:21:08 UTC
I'm not sure, if this is a bug or an enhancement request.

cc: Design team
Comment 2 Heiko Tietze 2019-10-10 07:51:18 UTC
Hard to say whether it's a bug or enhancement. Users expect the Apply function to work across tabs but it isn't.

(Usability issues are never trivial; and we should focus on one issue per ticket- the rounding topic is something else.)
Comment 3 Ivan 2019-10-10 08:12:30 UTC
I found, that a rounding bug is on other windows too (for example, on paragraph style window). I don't know must I open new bug report or no because a cause, it seems, identical.
Comment 4 Dieter 2021-09-02 11:32:38 UTC
Still present in

Version: (x64) / LibreOffice Community
Build ID: 2a7ea282da28d665a7dc086360567b4aea27bf08
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 5 QA Administrators 2023-10-08 03:16:10 UTC Comment hidden (obsolete)
Comment 6 Dieter 2023-11-01 10:59:46 UTC
Both problems still present in

Version: (X86_64) / LibreOffice Community
Build ID: 56f7684011345957bbf33a7ee678afaf4d2ba333
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