Hennadii Stepanov

@Saibato Please squash your commits, and rebase the branch to avoid CI failures.

What is the status of this PR?

Concept ACK. How to navigate to the _Features_ page from the main one?

https://forum.kde.org/viewtopic.php?t=90626#p172050: > In order to use the native KDE file dialog, you need to link to Qt dynamically. https://forum.kde.org/viewtopic.php?t=90626#p172100: > This is a limitation in Qt, not KDE. > Qt...

> So why is the widget based dialog unable to detect any folders? That is the question in #32, and I'm still working on it :) This issue differs from...

@MarcoFalke > So why is the widget based dialog unable to detect any folders? A: https://github.com/bitcoin/bitcoin/pull/19536

UPDATE: such behavior observed on Linux only. Static builds work fine on Windows (tested Windows 10) and macOS (tested macOS 10.15.6).

``` $ make -C depends make: Entering directory '/home/hebasto/guix/GitHub/bitcoin/depends' Extracting qt... /home/hebasto/guix/GitHub/bitcoin/depends/sources/qtbase-opensource-src-5.9.8.tar.xz: OK /home/hebasto/guix/GitHub/bitcoin/depends/sources/qttranslations-opensource-src-5.9.8.tar.xz: OK /home/hebasto/guix/GitHub/bitcoin/depends/sources/qttools-opensource-src-5.9.8.tar.xz: OK Preprocessing qt... ... Configuring qt... Creating qmake... ... Done running configuration tests. Configure...

This @laanwj's [comment](https://github.com/bitcoin/bitcoin/pull/4284#issuecomment-45055298) is old enough but seems related: > As I've said before many times, I'm not happy about statically linking qt on Linux - and certainly not everything...

> Could missed GTK+ support cause this bug? It seems missed GTK+ support does _not_ cause this bug. I've configured and compiled static Qt with ``` Qt Widgets: GTK+ ......................................