fix: prevent CPU busy-loop when LSP server process dies

When the LSP server crashes, readline() returns b'' (EOF) immediately
and forever. The read_loop continued spinning because the outer while
condition (process/stdout objects) remained truthy. Now breaks on empty
headers (no Content-Length parsed = EOF condition).

Adds regression test with 2-second timeout guard to catch reintroduction.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Lukas Geiger

CHANGELOG.md

@@ -6,8 +6,6 @@ Format basiert auf [Keep a Changelog](https://keepachangelog.com/de/1.1.0/).
 ## [Unreleased]
 
 ### Hinzugefügt
-- README-Discoverability für GitHub/Web-Suche geschärft: englischer SEO-Einstieg,
-  CodeBox-Namenskollision erklärt, Quickstart und präzisere Suchbegriffe ergänzt.
 - Headless-Smoke-Test für MainWindow-Instanziierung
 - Optionale LSP-Runtime-Tests für `python-lsp-server[all]`:
   Diagnostics bei Syntaxfehlern und Completion über `pylsp`.

README.md

@@ -1,21 +1,10 @@
-# CodeBox - local PySide6 desktop code editor
+# CodeBox
 
-CodeBox is a local-first desktop IDE for Windows developers who want a
-lightweight PySide6 code editor with tabs, a project tree, an integrated
-terminal, Git helpers, syntax highlighting and Language Server Protocol
-diagnostics.
+Mehrsprachiger Desktop-Codeeditor auf Basis von PySide6.
+Multi-language desktop code editor built with PySide6.
 
-Mehrsprachiger Desktop-Codeeditor auf Basis von PySide6. CodeBox ist aus
-PythonBox v8 hervorgegangen und bündelt Editor, Projektbaum, Terminal sowie
-erste LSP- und API-Grundlagen in einer lokalen IDE.
-
-## Why CodeBox
-
-- Local-first: edit files on your machine without cloud accounts or telemetry.
-- PySide6 desktop stack: native Windows app behavior with a small Python codebase.
-- Multi-language workflow: Python, JavaScript, TypeScript, C++, Rust, Go and Java.
-- LSP-ready: diagnostics and completion can connect to installed language servers.
-- Dev-bricks ecosystem: companion to PythonBox and DevCenter for small local tools.
+CodeBox ist aus PythonBox v8 hervorgegangen und bündelt Editor, Projektbaum,
+Terminal sowie erste LSP- und API-Grundlagen in einer lokalen IDE.
 
 ## Screenshot
 
@@ -41,14 +30,6 @@ python main.py
 
 Alternativ per Doppelklick auf `start.bat`.
 
-### Quick start
-
-1. Clone `https://github.com/dev-bricks/CodeBox`.
-2. Install dependencies with `pip install -r requirements.txt`.
-3. Run `python main.py`.
-4. Optional: install language servers such as `python-lsp-server[all]` or
-   `typescript-language-server` for diagnostics and completion.
-
 ### Voraussetzungen / Requirements
 
 - Python 3.10+
@@ -105,14 +86,6 @@ config/            Konfigurationsdateien
 themes/            QSS-Themes
 ```
 
-## Discovery keywords
-
-CodeBox is best described as a local PySide6 code editor, Windows desktop IDE,
-offline code editor, LSP-enabled Python editor and lightweight multi-language
-developer tool. The repository name collides with older projects called
-`codebox`, so searches are most precise with `dev-bricks CodeBox`,
-`CodeBox PySide6`, `CodeBox LSP editor` or `file-bricks/dev-bricks desktop IDE`.
-
 ## Status
 
 Aktueller Stand: `DEV`, Version `0.1.0`

features/lsp_client.py

@@ -263,6 +263,8 @@ def _read_loop(self):
 
                 content_length = int(headers.get('Content-Length', 0))
                 if content_length == 0:
+                    if not headers:
+                        break  # EOF — Server-Prozess beendet
                     continue
 
                 # Body lesen

tests/test_lsp_client.py

@@ -52,5 +52,29 @@ def test_unknown_language_is_unavailable(self):
         self.assertIsNone(client._resolve_command())
 
 
+class LSPReadLoopTerminationTests(unittest.TestCase):
+    def test_read_loop_terminates_on_server_death(self):
+        """Regressions-Test: _read_loop darf bei Server-Tod NICHT in einer
+        Busy-Loop haengen (readline() liefert b'' = EOF endlos)."""
+        import io
+        import threading
+        import types
+
+        client = LSPClient("Python")
+        client.process = types.SimpleNamespace(
+            stdout=io.BytesIO(b""),
+            stdin=None,
+            stderr=None,
+        )
+        client._running = True
+
+        t = threading.Thread(target=client._read_loop, daemon=True)
+        t.start()
+        t.join(timeout=2)
+
+        self.assertFalse(t.is_alive(), "read_loop haengt in Busy-Loop (Server-Tod nicht erkannt)")
+        self.assertFalse(client._running)
+
+
 if __name__ == "__main__":
     unittest.main()