Fix typing compatibility

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "qmlease"
-version = "3.0.0b0"
+version = "3.0.0b1"
 homepage = "https://github.com/likianta/qmlease"
 description = "A flexible toolkit for Python programmer to efficiently develop QML graphical user interface."
 readme = "README.md"
@@ -19,13 +19,14 @@ lambda-ex = "^1.1.0"
 lk-logger = "^5.4.7"
 lk-utils = "^2.5.2"
 qtpy = "^2.3.0"
-typing-extensions = "*"
 pyside6 = { version = "*", optional = true }
 pyside2 = { version = "*", optional = true }
+# https://python-poetry.org/docs/dependency-specification/#python-restricted-dependencies
+typing-extensions = { version = "*", python = "<3.10" }
 
 [tool.poetry.extras]
-qt6 = ["pyside6"]  # pip install lk-qtquick-scaffold[qt6]
-qt5 = ["pyside2"]  # pip install lk-qtquick-scaffold[qt5]
+qt6 = ["pyside6"]  # pip install qmlease[qt6]
+qt5 = ["pyside2"]  # pip install qmlease[qt5]
 
 [build-system]
 requires = ["poetry"]

qmlease/qmlside/layout_engine.py

@@ -45,8 +45,8 @@ def auto_size_children(
 
         children = container.children()
 
-        elastic_items: dict[int, float] = {}  # dict[int index, float ratio]
-        stretch_items: dict[int, int] = {}  # dict[int index, int _]
+        elastic_items = {}  # dict[int index, float ratio]
+        stretch_items = {}  # dict[int index, int _]
         #   note: stretch_items.values() are useless (they are all zeros). it
         #   is made just for keeping the same type struct with elastic_items.
 

qmlease/qmlside/widgets_backend/scope.py

@@ -12,7 +12,7 @@
 
 
 class T:
-    KID = t.Tuple[int, tuple[bool, bool, bool]]  # key id
+    KID = t.Tuple[int, t.Tuple[bool, bool, bool]]  # key id
     FID = str  # function id
     #   (int key_code, (ctrl, shift, alt))