First beta release of next Kupfer version.
This version introduce some breaking changes:

• Python 3.9+ is requires
• core code was refactored, so external plugins may required some rewrite.

Changes

• New features:

  • User can configure preferred text editor; list is loaded from
    application registry.
  • List of terminals is loaded from application registry (applications
    with "terminal" tag). Some terminal are still preconfigured.
  • In plugins settings user can choose files and directories by appropriate
    dialog instead of type path manually.
  • Kupfer can more frequent refresh items in background and cache result;
    this make searching and browsing faster.
  • Make Kupfer window rounded again.
  • If more than one action have the same accelerator pressing key navigate
    between them; previously first action was activated.
  • Hosts and services have additional aliases "service:hostname"; this allow
    user to fast find items by entering e.g. "sshmyserverhostname".
  • Leaves representing songs (rhythmbox and audacious plugins) and
    leaves representing services have text representation, so user can
    i.e. copy it to clipboard or use whenever text is acceptable.

• Fix:

  • If actions have the same name, make it unique by adding plugin name;
    previously module name was added.
  • Improve detecting URLs, files path, and emails addresses in text.
  • Fix not working "select clipboard text" accelerator.
  • Fix presenting first line from Text leaves: now really show first line.
  • Browser track history of selected leaves and allow return to parent leaf
    instead of top of list.
  • Make sure that file opened in plugins are closed after load.

• Plugins:

  • New:

    • NetworkManager: manage network connections
    • Tmux: support tmux session and tmuxp workplaces.
    • Zoxide: load most used directories from zoxide database.
    • Vim: recent files opened in vim and quick access to configured
      VimWikis.
    • Tracker3: full-text search in Tracker 3 application.
    • Show QRCode plugin: generate qrcodes from text.
    • Aria2: download files be remote aria2 instance.
    • Screenshot: take desktop screenshot using 'scrot' or 'flamegraph'.

  • Updated:

    • Apt: add new actions: "Search for file in packages..." and "Browse
      packages.debian.org".

    • Application:

      • Add additional aliases do application: executable name and original
        (English) name.
      • New action "Open With...": open file with one of application that
        support given file type.
      • New action "Launch here": start application in selected folder.

    • Web Search: allow user to define custom search engines by provide
      appropriate URLs.

    • Audacious: use D-Bus for interaction with audacious.

    • Wikipedia:

      • User can configure more than one language for Wikipedia search;
        action "Search in Wikipedia" allow user to select Wikipedia language.
      • Add "S" accelerator for "Search in Wikipedia" action.

    • File actions: new action "Edit file content" that open configured
      text editor

    • Volumes:

      • New "Mount" action
      • Separate "Eject" and "Unmount" action.

    • Textfiles:

      • new action "Copy content" (with "C" accelerator): copy content of
        text file to clipboard
      • "Write To" action allow user to enter destination file name.
      • Fix selecting destination directory
      • Fix encoding on write files

    • Show Text: bring back "Large Type" action.

    • Chromium: monitor and load changes in bookmarks.

    • Dictionary: add support for GoldenDict

    • libvirt: monitor state of virtual machines

    • Archive manager: user can select 7zip (7z or 7za) to use instead
      of file-roller.

    • Session gnome, Session lxqt, Session xfce: user must confirm
      "logout" and "shutdown" actions

    • Session xfce: load favorite applications defined in Whisker Menu.

    • Image: detect images files by mime type, not by extension.

    • Rhythmbox: fix errors when no mpris module available.

    • SSH hosts: fix broken monitoring for configuration changes.

    • Windows: better detection of Kupfer windows.

    • Clipboard: detect URLs and files path in clipboard items and
      selected text.

    • Favorites: allow user to add to favorite only leaves than can be
      added.

    • Thunar: add "Open Trash" action

    • URL Actions: check response status code (accept only 2xx); if there
      is not exact filename in response or url, try to guess filename with
      extension by url and content type.