first commit

usr/share/applications/portprotonqt_return.desktop

@@ -0,0 +1,10 @@
+[Desktop Entry]
+Name=Return to PortProtonQt
+Exec=portproton-session-select gamescope
+Icon=steamdeck-gaming-return
+Terminal=false
+Type=Application
+StartupNotify=false
+Comment=Quickly exit the session to switch to PortProtonQt
+Comment[ru]=Быстрый выход из сессии для перехода в PortProtonQt
+Categories=Game;

usr/share/gamescope-session-plus/sessions.d/portprotonqt

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+CLIENTCMD="portprotonqt --fullscreen"

usr/share/icons/hicolor/scalable/actions/steamdeck-gaming-return.svg

@@ -0,0 +1,7 @@
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg id="svg2" height="64" style="" viewBox="0 0 64 64" width="64" xmlns="http://www.w3.org/2000/svg" sodipodi:docname="deck_icon.svg" inkscape:version="1.2-dev (d2dd25d878, 2022-02-01, custom)" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:svg="http://www.w3.org/2000/svg">
+    <path id="path42220" d="m 32 4 v 10 a 18 18 0 0 1 18 18 a 18 18 0 0 1 -18 18 v 10 a 28 28 0 0 0 28 -28 a 28 28 0 0 0 -28 -28 z" style="fill:#fff;fill-rule:evenodd"/>
+    <circle id="path43518" cx="32" cy="32" r="14" style="fill:#1a9fff;fill-rule:evenodd"/>
+    <path id="path52048" d="m 32 22 a 2 2 0 0 0 -1.4140625 .5859375 l -8 8 a 2.0002 2.0002 0 0 0 0 2.828125 l 8 8 a 2 2 0 0 0 2.828125 0 a 2 2 0 0 0 0 -2.828125 l -4.5859375 -4.5859375 h 11.171875 a 2 2 0 0 0 2 -2 a 2 2 0 0 0 -2 -2 h -11.171875 l 4.5859375 -4.5859375 a 2 2 0 0 0 0 -2.828125 a 2 2 0 0 0 -1.4140625 -.5859375 z" style="fill:#fff;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:0"/>
+    <g id="path89696" style=""/>
+</svg>

usr/share/polkit-1/actions/ru.linux_gaming.portprotonqt-session.policy

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN" "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
+<policyconfig>
+  <vendor>PortProtonQt</vendor>
+  <vendor_url>https://git.linux-gaming.ru/Boria138</vendor_url>
+  <action id="org.shadowblip.pkexec.run-session-select">
+    <description>Helper to switch sessions</description>
+    <icon_name>package-x-generic</icon_name>
+    <defaults>
+      <allow_any>yes</allow_any>
+      <allow_inactive>yes</allow_inactive>
+      <allow_active>yes</allow_active>
+    </defaults>
+    <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/portprotonqt-session-select</annotate>
+  </action>
+</policyconfig>

usr/share/wayland-sessions/gamescope-session-portprotonqt.desktop

@@ -0,0 +1,7 @@
+[Desktop Entry]
+Encoding=UTF-8
+Name=PortProtonQt
+Comment=PortProtonQt Session
+Exec=gamescope-session-plus portprotonqt
+Type=Application
+DesktopNames=gamescope