[Libreoffice-bugs] [Bug 127208] New: tilde displays like macron

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=127208

            Bug ID: 127208
           Summary: tilde displays like macron
           Product: LibreOffice
           Version: 6.0.7.3 release
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: mvsfrasson at gmail.com

Description:
Tilde accents displays sometimes displays like a macron diacritic sign. 

I realized that many times ã (a tilde) and õ (o tilde) display wrong when I am
editing regular documents, for font sizes 12pt and smaller, both regular,
italic, bold, bold+italic.

There is no apparent reason that triggers the bug.  


I reproduce this bug in other software, like GNU Emacs, so this may be a bug
not on libreoffice, but in a font rendering, but I have no knowledge to forward
to correct place.  I don't knot what is the font rendering library used.

Steps to Reproduce:
1. Set font to DejaVu Sans Mono (but it is reproducible with other fonts)

2. Copy/paste the following text on Writer

     13 12      11      10.5    10
reg     ãõ      ãõ      ãõ      ãõ      ãõ
it      ãõ      ãõ      ãõ      ãõ      ãõ
b       ãõ      ãõ      ãõ      ãõ      ãõ
b+it    ãõ      ãõ      ãõ      ãõ      ãõ

Set font according to "table" (columns are font sizes, lines are font specs
regular, italic, bold, bold+italic) to each group of 2 letters.

3. Ensure magnification 100%.


Actual Results:
For DejaVu Sans Mono, observe that tildes become macrons exactly for
õ r11 i11
ã b12
ãõ bi12 bi11 bi10

Selecting all and changing font change bug reproducion. for example, Liberation
Sans change bug to all letters 10pt. 

Expected Results:
Expected that all tilde accents display correctly.


Reproducible: Always


User Profile Reset: No



Additional Info:
$ uname -a
Linux sme-9373 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux

I use Xubuntu

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.3 LTS
Release:        18.04
Codename:       bionic


Libreoffice installed from ubuntu repositories.

$ apt list -a libreoffice
Listing... Pronto
libreoffice/bionic-updates,bionic-security,now 1:6.0.7-0ubuntu0.18.04.9 amd64
[installed]
libreoffice/bionic 1:6.0.3-0ubuntu1 amd64

>From Libreoffice About dialogue:

Versão: 6.0.7.3
ID de compilação: 1:6.0.7-0ubuntu0.18.04.9
Threads da CPU:4; SO:Linux 4.15; Realizador da interface: padrão; VCL: gtk3; 
Local: pt-BR (pt_BR.UTF-8); Calc: group

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