QFileDialog::getOpenFilename shows a Qt dialog instead of native dialog on Linux

[n-elie]

Issue:
QFileDialog::getOpenFilename shows a Qt dialog instead of native dialog when using Qt from conda-forge. The native dialog shows up if using system Qt or Qt from anaconda channel.
On Windows, with the conda-forge Qt, the native dialog is also used.

This simple example can be used to reproduce the problem:

#include <QApplication>
#include <QFileDialog>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QFileDialog::getOpenFileName();
    return a.exec();
}

Any idea what's wrong?

Environment (conda list):

$ conda list
# packages in environment at /home/nicolas/miniconda3/envs/qt-conda-forge:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                       0_gnu    conda-forge
ca-certificates           2020.4.5.1           hecc5488_0    conda-forge
certifi                   2020.4.5.1       py38h32f6830_0    conda-forge
dbus                      1.13.6               he372182_0    conda-forge
expat                     2.2.9                he1b5a44_2    conda-forge
fontconfig                2.13.1            h86ecdb6_1001    conda-forge
freetype                  2.10.1               he06d7ca_0    conda-forge
gettext                   0.19.8.1          hc5be6a0_1002    conda-forge
glib                      2.58.3          py38h73cb85d_1004    conda-forge
gst-plugins-base          1.14.5               h0935bb2_2    conda-forge
gstreamer                 1.14.5               h36ae1b5_2    conda-forge
icu                       64.2                 he1b5a44_1    conda-forge
jpeg                      9c                h14c3975_1001    conda-forge
ld_impl_linux-64          2.34                 h53a641e_0    conda-forge
libclang                  9.0.1           default_hde54327_0    conda-forge
libffi                    3.2.1             he1b5a44_1007    conda-forge
libgcc-ng                 9.2.0                h24d8f2e_2    conda-forge
libgomp                   9.2.0                h24d8f2e_2    conda-forge
libiconv                  1.15              h516909a_1006    conda-forge
libllvm9                  9.0.1                hc9558a2_0    conda-forge
libpng                    1.6.37               hed695b0_1    conda-forge
libstdcxx-ng              9.2.0                hdf63c60_2    conda-forge
libuuid                   2.32.1            h14c3975_1000    conda-forge
libxcb                    1.13              h14c3975_1002    conda-forge
libxkbcommon              0.10.0               he1b5a44_0    conda-forge
libxml2                   2.9.10               hee79883_0    conda-forge
ncurses                   6.1               hf484d3e_1002    conda-forge
nspr                      4.25                 he1b5a44_0    conda-forge
nss                       3.47                 he751ad9_0    conda-forge
openssl                   1.1.1f               h516909a_0    conda-forge
pcre                      8.44                 he1b5a44_0    conda-forge
pip                       20.0.2                     py_2    conda-forge
pthread-stubs             0.4               h14c3975_1001    conda-forge
python                    3.8.2           h8356626_5_cpython    conda-forge
python_abi                3.8                      1_cp38    conda-forge
qt                        5.12.5               hd8c4c69_1    conda-forge
readline                  8.0                  hf8c457e_0    conda-forge
setuptools                46.1.3           py38h32f6830_0    conda-forge
sqlite                    3.30.1               hcee41ef_0    conda-forge
tk                        8.6.10               hed695b0_0    conda-forge
wheel                     0.34.2                     py_1    conda-forge
xorg-libxau               1.0.9                h14c3975_0    conda-forge
xorg-libxdmcp             1.1.3                h516909a_0    conda-forge
xz                        5.2.5                h516909a_0    conda-forge
zlib                      1.2.11            h516909a_1006    conda-forge

Details about conda and system ( conda info ):

$ conda info

     active environment : qt-conda-forge
    active env location : /home/nicolas/miniconda3/envs/qt-conda-forge
            shell level : 2
       user config file : /home/nicolas/.condarc
 populated config files : /home/nicolas/.condarc
          conda version : 4.8.3
    conda-build version : 3.18.11
         python version : 3.7.4.final.0
       virtual packages : __glibc=2.31
       base environment : /home/nicolas/miniconda3  (writable)
           channel URLs : https://conda.anaconda.org/rdkit/linux-64
                          https://conda.anaconda.org/rdkit/noarch
                          https://conda.anaconda.org/bioconda/linux-64
                          https://conda.anaconda.org/bioconda/noarch
                          https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /home/nicolas/miniconda3/pkgs
                          /home/nicolas/.conda/pkgs
       envs directories : /home/nicolas/miniconda3/envs
                          /home/nicolas/.conda/envs
               platform : linux-64
             user-agent : conda/4.8.3 requests/2.23.0 CPython/3.7.4 Linux/5.4.27-1-MANJARO manjaro/19.0.2 glibc/2.31
                UID:GID : 1000:1001
             netrc file : None
           offline mode : False

[hmaarrfk]

i'm not too sure. Maybe we can check for differences in the recipes?

[hmaarrfk]

i was just wondering if other people were hitting the same thing.