Log Message:
vala: update to 0.50.1.

Vala 0.50.1
===========
 * Various improvements and bug fixes:
  - codegen:
    + Don't falsly use g_return_val_if_fail() for async creation method [#1077]
    + Don't pass CCodeFunctionCall to NULL-aware free macro
  - vala:
    + Improve parsing of with-statement and allow it as embedded statement
    + Prioritize the usage of an existing with-variable instance,
      Recognize previously inserted implicit access to with-variable [#1043]
  - parser: Allow to begin expression with statement keyword [#1073]
  - g-i: Fix a couple of C compiler warnings
  - libvaladoc: Fix a couple of C compiler warnings
  - testrunner: Pass --enable-checking to increase coverage, Filter external
    -0X flags to preserve current default -O0
  - build: Stop passing obsolete --use-header

 * Bindings:
  - gstreamer: Update from 1.19.0+ git master
  - gtk4: Don't skip LayoutManager.create_layout_child() [#1071]
  - gtk4: Update to 3.99.1+15b635d7
  - vapi: Update GIR-based bindings
  - webkit2gtk-4.0: Update to 2.30.1

Vala 0.50.0
===========
 * Various improvements and bug fixes:
  - codegen: The actual struct size is required for calloc (POSIX) [#1068]

 * Bindings:
  - gstreamer: Update from 1.18.0+ git master
  - poppler-glib: Update to 20.09.0
  - vapi: Update GIR-based bindings

Vala 0.49.92
============
 * Various improvements and bug fixes:
  - Don't use locale dependent string functions on syntax strings [#1067]
  - girparser: Additionally fallback to "glib:type-name" to retrieve \ 
the cname
  - libvaladoc/girimporter:
    + Fallback to "name" for callback
    + Fallback to "glib:type-name" for class, interface and record
    + Improve parse_symbol_doc() and don't use parse_doc()
    + Skip "attribute" elements
  - libvaladoc/gtkdoc-importer:
    + Correctly retrieve "url" from "ulink" elements
    + Don't let parse_block_taglet() return null

 * Bindings:
  - gtk4: Update to 3.99.1
  - vapi: Update GIR-based bindings

Vala 0.49.91
============
 * Various improvements and bug fixes:
  - codegen: Don't append unreachable clean-up section of Block [#169] [#838]
  - codegen: Always include base_struct declaration if available [#464]
  - vala: Additionally break on ObjectCreationExpression in "tainted" check
  - vala: Add ObjectCreationExpression.to_string()
  - manual: Update from wiki.gnome.org

 * Bindings:
  - gio-unix-2.0,glib-2.0: Updates for 2.66
  - gtk4: Resolve a few conflicts of methods with virtual-methods

Vala 0.49.90
============
 * Regression and bug fixes:
  - Revert "girwriter: Use appropriate get_ccode_* functions" [#1059]
  - tests: Don't rely on undefined use-after-free behaviour of glibc
  - Add TraverseVisitor for traversing the tree with a callback
  - Force usage of temporary variables for "tainted" member accesses \ 
[#1061]
  - vala: Move transformation of unary increment/decrement to codegen
  - vala: Set parent_node for child nodes of lambda-expression [#1062]

 * Bindings:
  - gstreamer: Update from 1.17.2+ git master
  - gtk4: Update to 3.99.0+e6e2d6b4
  - pango: Update from 1.46.0
  - webkit2gtk-4.0: Update to 2.29.91

Vala 0.49.2
===========
 * Highlights:
  - Support non-virtual signals with default handler [#1056]

 * Various improvements and bug fixes:
  - codegen: Include header for base-symbols when connecting vfuncs
  - vala:
    + Inherit CCode.returns_floating_reference attribute from base [#1053]
    + Mark tranformed member-access as qualified [#57]
    + Switch context if with-variable is not owned by with-statement [#1043]
  - girparser: Add support for string "feature_test_macro" metadata

 * Bindings:
  - gio-2.0: Include "gio/gsettingsbackend.h" for GLib.SettingsBackend
    members [#1054]
  - goocanvas-2.0: Fix some field ownerships and types [#1057]
  - gstreamer: Update from 1.17.2+ git master
  - gtk4: Update to 3.99.0+358b698e
  - pango: Update from 1.45.4+
  - posix: Add missing "has_typedef" attribute for some delegates
  - posix: Declare WRDE_APPEND constant as public
  - vapi: Update GIR-based bindings

Vala 0.49.1
===========
 * Highlights:
  - Use defintions of public header in internal header if available
    and drop --use-header compiler option and enable it by default [#713]
  - gdbus: Use GDBusProxy API to set `g-interface-info` at initialization time
  - Check vfunc of abstract/virtual methods and property accessors for NULL
    before using it [#153]
  - Check coverage of switch on enum-type and issue warnings if needed [#777]
  - Map empty start/end index to 0/length for slice expressions [#238]
  - Add support for "with" statement (mark them experiemental) [#327]
  - Use inheritted scopes of base-types/prerequisites to resolve symbols [#54]

 * Various improvements and bug fixes:
  - codegen:
    + Add implicit parameter and instance checks in async method [#1005]
    + Make use of CCode.cname for label name of CatchClause
  - vala:
    + Move setting of target profile and standard packages into CodeContext
    + Remove some public API from expressions and statements
    + Add Expression.is_always_true/false() helpers
    + Add InvalidExpression as replacement for erroneous nodes instead
    + Don't loose invalid_syntax when copying array type for variables [#942]
  - girparser: Strip "Enum"-suffix only from enumeration
  - girwriter: Internal fields/vfuncs in type-symbols are public in C [#513]
  - libvaladoc: Remove unused Api.Class.get_finalize_function_name() API
  - testrunner: Add more -Werror=* flags

 * Bindings:
  - gio-unix-2.0: Fix "g_unix_mount_for" binding [#1052]
  - glib-2.0,gio-2.0,gobject-2.0: Updates for 2.66
  - glib-2.0: data of GLib.Bytes is allowed to be null
  - glib-2.0: Add more explicit type_id attributes for various symbols
  - gstreamer: Update from 1.17.2+ git master
  - gtk4: Update to 3.99.0+d743e757
  - pango: Update from 1.45.2
  - vapi: Update GIR-based bindings