Bug#836531: Bug#837356: libreoffice-gtk3: Impress is unusably slow on GNOME 3 with libreoffice-gtk3 installed

Hi,

On Wed, Sep 14, 2016 at 10:53:13PM -0300, Daniel Serpell wrote:
> [...] An strace shows this sequence repeated many times:  
[...]
> [pid 28769] open("/usr/share/fonts/opentype/cantarell/Cantarell-Regular.otf", O_RDONLY) = 35
> [pid 28769] fstat(35, {st_mode=S_IFREG|0644, st_size=69076, ...}) = 0
> [pid 28769] mmap(NULL, 69076, PROT_READ, MAP_SHARED, 35, 0) = 0x7fddcc13b000
> [pid 28769] close(35)                   = 0
> [pid 28769] clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {41, 526077669}) = 0
> -------------------------------------------------------------------------
> 
> Note that the name of the font file is always the same. After
> uninstalling the package libreoffice-gtk3, the dialog opens at once.

And given LO (AFAIK) does nothing with cantarell itself but:

$ apt-cache show fonts-cantarell
Package: fonts-cantarell
Version: 0.0.16-1
Installed-Size: 174
Maintainer: Debian Fonts Task Force <[email protected]>
Architecture: all
Depends: fontconfig
Description-en: sans serif font family designed for on-screen readability
 The Cantarell font family is designed as a contemporary Humanist sans serif
 and is particularly designed for on-screen reading on mobile devices at small
 sizes, such as phones and tablets.
 .
 This is the open font officially chosen by default for the GNOME 3 desktop and
 for Fedora branding materials.
 .
 Regular and bold weights are provided for now. Italics are planned.
 .
 Each font file currently contains 391 glyphs, and fully support the
 following writing systems: Basic Latin, Western European, Catalan,
 Baltic, Turkish, Central European, Dutch and Afrikaans.
Description-md5: caccfeef0878116a50e0182694ad1168
Multi-Arch: foreign
Homepage: http://live.gnome.org/CantarellFonts
Tag: made-of::font, role::data, x11::font
Section: fonts
Priority: optional
Filename: pool/main/f/fonts-cantarell/fonts-cantarell_0.0.16-1_all.deb
Size: 64364
MD5sum: 605bf43fed0bbeb868f528c50a3ed9ae
SHA1: a6bbf699d6a1079a67ad94126eda43ec071df800
SHA256: 1b655c76b8e3d7cd363be4d4c2dbb9e09f54e74564bad4ff1ef44b8336f4bfd3

> I'm running libreoffice under Gnome desktop.

.. I'd actually believe this is a Gtk3 and/or GNOME bug?

What happens if you downgrade Gtk3 to 3.20.9-1 or so?
(http://snapshot.debian.org/package/gtk%2B3.0/3.20.9-1/#libgtk-3-0_3.20.9-1)

This report and #836531 (I think) started happening with the new Gtk, because
at least for #836531

[2016-08-20] libreoffice 1:5.2.0-2 MIGRATED to testing (Britney)
[2016-08-14] Accepted 1:5.2.0-2 in unstable (medium) (Rene Engelhard)

^ this happened before

[2016-08-30] Accepted 3.21.5-1 in unstable (low) (Andreas Henriksson)

^this and the report was from 2016-09-03....

Cc'ing #836531 and -gtk-gnome.

Regards,

Rene