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

Hi!

On Thu, Sep 15, 2016 at 5:59 AM, Rene Engelhard <[email protected]> wrote:
>
> 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)
>

Downgrading Gtk3 to 3.20.9-1 fixes the bug!!

So, it is probably a bug in Gtk3 or in the way that LO uses Gtk (because no
other Gtk app seems affected).

>
> Cc'ing #836531 and -gtk-gnome.
>

Thanks,

    Daniel.