Retire old qubes-vm-create dialog

Retire the the old PyQt based `qubes-vm-create` dialog and replace it
with GTK based `qubes-new-qube` for Qube Manager.

resolves: QubesOS/qubes-issues#6561

Makefile

@@ -40,7 +40,6 @@ install:
 	cp qubesmanager/qvm_about.sh $(DESTDIR)/usr/libexec/qubes-manager/
 
 	mkdir -p $(DESTDIR)/usr/share/applications
-	cp qubes-vm-create.desktop $(DESTDIR)/usr/share/applications/
 	cp qubes-backup.desktop $(DESTDIR)/usr/share/applications/
 	cp qubes-backup-restore.desktop $(DESTDIR)/usr/share/applications/
 	cp qubes-qube-manager.desktop $(DESTDIR)/usr/share/applications/

debian/install

@@ -67,7 +67,6 @@
 
 /usr/lib/*/dist-packages/qubesmanager-*.egg-info/*
 
-/usr/share/applications/qubes-vm-create.desktop
 /usr/share/applications/qubes-backup.desktop
 /usr/share/applications/qubes-backup-restore.desktop
 /usr/share/applications/qubes-qube-manager.desktop

qubesmanager/qube_manager.py

@@ -35,7 +35,7 @@
 # pylint: disable=import-error
 from PyQt6.QtCore import (Qt, QAbstractTableModel, QObject, pyqtSlot, QEvent,
                           QSettings, QRegularExpression, QSortFilterProxyModel,
-                          QSize, QPoint, QTimer)
+                          QSize, QProcess, QPoint, QTimer)
 
 # pylint: disable=import-error
 from PyQt6.QtWidgets import (QLineEdit, QStyledItemDelegate, QToolTip,
@@ -903,6 +903,8 @@ def __init__(self, qt_app, qubes_app, dispatcher, _parent=None):
         self.size_on_disk_timer.setInterval(1000 * 60 * 5)  # every 5 mins
         self.size_on_disk_timer.start()
 
+        self.new_qube = QProcess()
+
     def eventFilter(self, _object, event):
         ''' refresh disk usage every 60s if focused & every 5m in background '''
         if event.type() == QEvent.Type.WindowActivate:
@@ -1398,10 +1400,16 @@ def update_network_menu(self):
     # noinspection PyArgumentList
     @pyqtSlot(name='on_action_createvm_triggered')
     def action_createvm_triggered(self):
-        with common_threads.busy_cursor():
-            create_window = create_new_vm.NewVmDlg(
+        if self.new_qube.state() == QProcess.ProcessState.Running:
+            return
+        if path.isfile("/usr/bin/qubes-new-qube"):
+            self.new_qube.start("/usr/bin/qubes-new-qube")
+        else:
+            # for stubborn users who might uninstall `desktop-linux-manager`
+            with common_threads.busy_cursor():
+                create_window = create_new_vm.NewVmDlg(
                     self.qt_app, self.qubes_app, self)
-        create_window.exec()
+                create_window.exec()
 
     # noinspection PyArgumentList
     @pyqtSlot(name='on_action_removevm_triggered')
@@ -1671,6 +1679,8 @@ def open_settings(self, vm, tab='basic'):
                     "\nError: {}".format(str(ex))))
 
     def closeEvent(self, _):
+        if self.new_qube.state() == QProcess.ProcessState.Running:
+            self.new_qube.terminate()
         self.save_showing()
 
     # noinspection PyArgumentList

rpm_spec/qmgr.spec.in

@@ -128,7 +128,6 @@ rm -rf $RPM_BUILD_ROOT
 %dir %{python3_sitelib}/qubesmanager-*.egg-info
 %{python3_sitelib}/qubesmanager-*.egg-info/*
 
-/usr/share/applications/qubes-vm-create.desktop
 /usr/share/applications/qubes-backup.desktop
 /usr/share/applications/qubes-backup-restore.desktop
 /usr/share/applications/qubes-qube-manager.desktop