fix: Qt6 Wayland crash — systemic generator fix. Greeter UI boots!

Root cause: qtwaylandscanner emits unconditional init_listener() calls.
Generated code: wl_*_add_listener(m_wl_*, ...) without null check.
NULL proxy from wlRegistryBind() → page fault at offset 8.

Fix: patched qtwaylandscanner.cpp line 1297 to emit null-guarded
listener registration:
    if (m_%s) %s_add_listener(m_%s, &m_%s_listener, this);

This covers ALL generated Wayland wrappers — wl_*, xdg_*, zwp_*, wp_* —
in one generator change. Removed fragile regex post-build patching.

VERIFIED: greeter UI boots without page fault. QML loads. Wayland
binds all 7 globals (compositor/shp/seat/output/data_device_mgr/
subcompositor/xdg_wm_base). QWaylandDisplay: valid registry+display.

local/recipes/qt/qtbase/patch-and-rebuild.sh

@@ -1,17 +0,0 @@
-#!/bin/bash
-# Patch Qt6 Wayland wrappers and recompile affected objects.
-# Must run AFTER cmake --build because generated files are created by ninja.
-set -e
-SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-
-for gen in \
-    src/plugins/platforms/wayland/qwayland-wayland.cpp \
-    src/plugins/platforms/wayland/plugins/shellintegration/wl-shell/qwayland-wayland.cpp
-do
-    [ -f "$gen" ] || continue
-    python3 "$SCRIPT_DIR/scripts/patch-wayland-wrappers.py" "$gen" || true
-done
-
-# Rebuild the patched objects
-cmake --build . -j"${COOKBOOK_MAKE_JOBS:-4}" 2>&1 || true
-echo "qt6-wayland-guard: done"

local/recipes/qt/qtbase/recipe.toml

@@ -659,8 +659,6 @@ cmake "${COOKBOOK_SOURCE}" \
     -Wno-dev
 
 cmake --build . -j${COOKBOOK_MAKE_JOBS}
-# Patch generated Qt6 Wayland wrappers with null guards, then recompile
-bash "${COOKBOOK_RECIPE}/patch-and-rebuild.sh"
 
 # Qt's top-level install script expects a hashed export path under CMakeFiles/Export,
 # but on this Redox cross-build the generated file only exists at lib/cmake/Qt6/Qt6Targets.cmake.

local/recipes/qt/qtbase/scripts/patch-wayland-wrappers.py

@@ -1,43 +0,0 @@
-#!/usr/bin/env python3
-"""Patch Qt6 generated Wayland wrappers with null guards.
-Qt6 passes NULL proxies to wl_*_add_listener() during init on Redox,
-causing page fault at null+8 (write to proxy->object.implementation).
-
-This script wraps every wl_*_add_listener(m_wl_*, ...) call with:
-    if (m_wl_*) wl_*_add_listener(m_wl_*, ...)
-"""
-import re, sys, os
-
-def patch_file(path):
-    if not os.path.exists(path):
-        print(f"qt6-wayland-guard: {path} not found, skipping")
-        return False
-    with open(path) as f:
-        original = f.read()
-    
-    patched = original
-    # Guard: wl_compositor_add_listener(m_wl_compositor, ...)
-    patched = re.sub(
-        r'(wl_[a-z_]+_add_listener)\(m_wl_([a-z_]+),',
-        r'if (m_wl_\2) \1(m_wl_\2,',
-        patched
-    )
-    # Also guard wl_registry_add_listener specifically
-    patched = re.sub(
-        r'(wl_registry_add_listener)\(m_wl_registry,',
-        r'if (m_wl_registry) \1(m_wl_registry,',
-        patched
-    )
-    
-    if patched != original:
-        with open(path, 'w') as f:
-            f.write(patched)
-        print(f"qt6-wayland-guard: patched {path}")
-        return True
-    else:
-        print(f"qt6-wayland-guard: {path} already patched or no matches")
-        return False
-
-if __name__ == '__main__':
-    for p in sys.argv[1:]:
-        patch_file(p)

local/recipes/qt/qtbase/source/src/tools/qtwaylandscanner/qtwaylandscanner.cpp

@@ -1294,7 +1294,7 @@ bool Scanner::process()
 
                 printf("    void %s::init_listener()\n", interfaceName);
                 printf("    {\n");
-                printf("        %s_add_listener(m_%s, &m_%s_listener, this);\n", interfaceName, interfaceName, interfaceName);
+                printf("        if (m_%s) %s_add_listener(m_%s, &m_%s_listener, this);\n", interfaceName, interfaceName, interfaceName, interfaceName);
                 printf("    }\n");
             }
         }