Include native kernel (python3 for Python) to kernel lists

Re Issue #2824

requirements.txt

@@ -1,4 +1,4 @@
 -e git+https://github.com/spine-tools/Spine-Database-API.git#egg=spinedb_api
--e git+https://github.com/spine-tools/spine-engine.git#egg=spine_engine
--e git+https://github.com/spine-tools/spine-items.git#egg=spine_items
+-e git+https://github.com/spine-tools/spine-engine.git@toolbox_issue_2824#egg=spine_engine
+-e git+https://github.com/spine-tools/spine-items.git@toolbox_issue_2824#egg=spine_items
 -e .

spinetoolbox/kernel_fetcher.py

@@ -15,8 +15,7 @@
 import json
 from PySide6.QtCore import Signal, Slot, QThread
 from PySide6.QtGui import QIcon
-from jupyter_client.kernelspec import find_kernel_specs
-from spine_engine.utils.helpers import resolve_conda_executable
+from spine_engine.utils.helpers import resolve_conda_executable, custom_find_kernel_specs
 from spine_engine.execution_managers.conda_kernel_spec_manager import CondaKernelSpecManager
 
 
@@ -50,9 +49,9 @@ def stop_thread(self):
 
     def get_all_regular_kernels(self):
         """Finds all kernel specs as quickly as possible."""
-        for kernel_name, resource_dir in find_kernel_specs().items():  # Find regular Kernels
-            if not os.path.exists(resource_dir):
-                continue
+        for kernel_name, resource_dir in custom_find_kernel_specs().items():  # Find regular Kernels
+            # if not os.path.exists(resource_dir):
+            #     continue
             icon = self.get_icon(resource_dir)
             self.kernel_found.emit(kernel_name, resource_dir, False, icon, {})
             if not self.keep_going:
@@ -79,7 +78,7 @@ def run(self):
             self.get_all_conda_kernels()
             return
         # To find just a subset of kernels, we need to open kernel.json file and check the language
-        for kernel_name, resource_dir in find_kernel_specs().items():
+        for kernel_name, resource_dir in custom_find_kernel_specs().items():
             d = self.get_kernel_deats(resource_dir)
             icon = self.get_icon(resource_dir)
             if d["language"].lower().strip() == "python":  # Regular Python kernel found

spinetoolbox/widgets/kernel_editor.py

@@ -15,8 +15,7 @@
 from PySide6.QtWidgets import QDialog, QMessageBox, QDialogButtonBox, QWidget
 from PySide6.QtCore import Slot, Qt, QTimer
 from PySide6.QtGui import QGuiApplication, QIcon
-from jupyter_client.kernelspec import find_kernel_specs
-from spine_engine.utils.helpers import resolve_current_python_interpreter, resolve_default_julia_executable
+from spine_engine.utils.helpers import resolve_current_python_interpreter, resolve_default_julia_executable, custom_find_kernel_specs
 from spinetoolbox.execution_managers import QProcessExecutionManager
 from spinetoolbox.helpers import (
     busy_effect,
@@ -56,7 +55,7 @@ def __init__(self, parent, python_or_julia):
         self._rebuild_ijulia_process = None
         self._install_julia_kernel_process = None
         self._ready_to_install_kernel = False
-        self.kernel_names_before = find_kernel_specs().keys()
+        self.kernel_names_before = custom_find_kernel_specs().keys()
         self._new_kernel_name = ""
         self.setAttribute(Qt.WA_DeleteOnClose)
         self._cursors = {w: w.cursor() for w in self.findChildren(QWidget)}
@@ -93,7 +92,7 @@ def new_kernel_name(self):
 
     def _solve_new_kernel_name(self):
         """Finds out the new kernel name after a new kernel has been created."""
-        kernel_names_after = find_kernel_specs().keys()
+        kernel_names_after = custom_find_kernel_specs().keys()
         try:
             self._new_kernel_name = list(set(kernel_names_after) - set(self.kernel_names_before))[0]
         except IndexError: