Bump to 4.3.6: Windows UTF-8 startup fix (dart_bridge 1.5.1, python-build 20260720) (#238)

* Bump to 4.3.5: Windows UTF-8 startup fix (dart_bridge 1.5.1, python-build 20260720)

Re-pin the bundled python-build snapshot to 20260720, which bumps dart_bridge
1.5.0 -> 1.5.1. 1.5.1 fixes Windows startup when app paths or environment
values contain non-ASCII characters: Dart FFI strings (UTF-8) are now converted
to UTF-16 before hitting the Windows CRT (_wputenv_s / _wfopen_s), Python UTF-8
mode is enabled before Py_Initialize(), and embedded env-setup failures are
fatal. Closes flet-dev/flet#6641.

Windows-only change; iOS/macOS/Android/Linux runtimes are functionally
unchanged from 20260719. Python versions (3.12.13 / 3.13.14 / 3.14.6) unchanged.

* Retarget release 4.3.5 -> 4.3.6 (4.3.5 was accidentally published and pulled)

4.3.5 was published to pub.dev by mistake before this PR merged and has been
retracted, so the version number is burned. Bump all packages and CHANGELOG
sections to 4.3.6. Content is identical: python-build 20260720 / dart_bridge
1.5.1 Windows UTF-8 startup fix (flet #6641).

Author: FeodorFitsner

src/serious_python/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 4.3.6
+
+* **Windows:** fix startup with non-ASCII app paths or environment values — Dart FFI strings (UTF-8) are now converted to UTF-16 before being passed to the Windows CRT, so paths/env values are no longer corrupted through the process ANSI code page, and Python UTF-8 mode is enabled before `Py_Initialize()`. See `serious_python_windows` 4.3.6 and flet-dev/flet#6641.
+* Bundled python-build snapshot re-pinned to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**, which carries the Windows fix above). Python versions (**3.12.13 / 3.13.14 / 3.14.6**) are unchanged.
+
 ## 4.3.4
 
 * **Windows/Linux:** desktop apps on Python **3.14** no longer crash at startup with `ModuleNotFoundError: No module named '_pyrepl'` when the app (or a dependency, e.g. NLTK) imports `pydoc` or `pdb`. `_pyrepl` was pruned from the desktop stdlib as a dev-only module, but 3.14's `pydoc`/`pdb` import it at module load. See `serious_python_windows` / `serious_python_linux` 4.3.4 and flet-dev/serious-python#236.

src/serious_python/lib/src/python_versions.dart

@@ -1,5 +1,5 @@
 // GENERATED by `dart run serious_python:gen_version_tables` from python-build's
-// manifest.json (release 20260719). Do not edit by hand — edit python-build's
+// manifest.json (release 20260720). Do not edit by hand — edit python-build's
 // manifest.json, cut a release, bump `pythonReleaseDate`, and regenerate.
 
 const pythonVersionEnvironmentVariable = "SERIOUS_PYTHON_VERSION";
@@ -10,8 +10,8 @@ const pyodideVersionEnvironmentVariable = "SERIOUS_PYTHON_PYODIDE_VERSION";
 const dartBridgeVersionEnvironmentVariable = "DART_BRIDGE_VERSION";
 
 /// python-build release the bundled runtimes come from (YYYYMMDD).
-const pythonReleaseDate = "20260719";
-const dartBridgeVersion = "1.5.0";
+const pythonReleaseDate = "20260720";
+const dartBridgeVersion = "1.5.1";
 const defaultPythonVersion = "3.14";
 
 class PythonRelease {

src/serious_python/pubspec.yaml

@@ -2,7 +2,7 @@ name: serious_python
 description: A cross-platform plugin for adding embedded Python runtime to your Flutter apps.
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.4
+version: 4.3.6
 
 platforms:
   ios:

src/serious_python_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 4.3.6
+
+* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.6); the Android runtime is functionally unchanged from 20260719.
+
 ## 4.3.4
 
 * Re-pins the bundled python-build snapshot to **20260719** (previously 20260714). The snapshot un-prunes `_pyrepl` on Windows/Linux desktop only; Android already shipped `_pyrepl` (un-pruned in 4.3.2), so these runtimes are byte-identical to 20260714.

src/serious_python_android/android/build.gradle.kts

@@ -21,7 +21,7 @@ buildscript {
 }
 
 group = "com.flet.serious_python_android"
-version = "4.3.4"
+version = "4.3.6"
 
 rootProject.allprojects {
     repositories {

src/serious_python_android/android/python_versions.properties

@@ -1,8 +1,8 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
-# python-build manifest.json (release 20260719). Do not edit by hand.
+# python-build manifest.json (release 20260720). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.5.0
-python_build_release_date=20260719
+dart_bridge_version=1.5.1
+python_build_release_date=20260720
 3.12.full_version=3.12.13
 3.12.android_abis=arm64-v8a,x86_64,armeabi-v7a
 3.13.full_version=3.13.14

src/serious_python_android/pubspec.yaml

@@ -2,7 +2,7 @@ name: serious_python_android
 description: Android implementation of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.4
+version: 4.3.6
 
 environment:
   sdk: ">=3.0.0 <4.0.0"

src/serious_python_darwin/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 4.3.6
+
+* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.6); the iOS/macOS runtimes are functionally unchanged from 20260719.
+
 ## 4.3.4
 
 * Re-pins the bundled python-build snapshot to **20260719** (previously 20260714). The snapshot un-prunes `_pyrepl` on Windows/Linux desktop (fixing a 3.14 `pydoc`/`pdb` crash — see `serious_python_windows` / `serious_python_linux` 4.3.4); iOS/macOS already shipped `_pyrepl` (un-pruned in 4.3.2), so these runtimes are byte-identical to 20260714. No iOS/macOS-affecting changes.

src/serious_python_darwin/darwin/python_versions.properties

@@ -1,8 +1,8 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
-# python-build manifest.json (release 20260719). Do not edit by hand.
+# python-build manifest.json (release 20260720). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.5.0
-python_build_release_date=20260719
+dart_bridge_version=1.5.1
+python_build_release_date=20260720
 3.12.full_version=3.12.13
 3.12.android_abis=arm64-v8a,x86_64,armeabi-v7a
 3.13.full_version=3.13.14

src/serious_python_darwin/darwin/serious_python_darwin.podspec

@@ -4,7 +4,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'serious_python_darwin'
-  s.version          = '4.3.4'
+  s.version          = '4.3.6'
   s.summary          = 'A cross-platform plugin for adding embedded Python runtime to your Flutter apps.'
   s.description      = <<-DESC
   A cross-platform plugin for adding embedded Python runtime to your Flutter apps.