feat(pangocairo): 删掉 cairo.h 变通 —— cairo 的修复已经发布

freedesktop.cairo 1.18.2-mcpp3 已在 main:697 个名字,cairo_t 与 192 个枚举量
都在。普通的 export import cairo; 就够了 —— 本来就该够 —— 而且模块名现在是
cairo。

⚠️ 难的是次序不是代码。这个包从**已发布的**索引解析 cairo,而一个索引 PR 没法
同时验证两边:一个成员只能声明一个项目级 index repo(xlings#374 / mcpp#238),
所以 tests/examples/pangocairo 不能同时用本地的 gnome.* 和本地的 freedesktop.*
描述符。在 cairo 发布之前删这个变通,会让两边都红,而每一行代码都是对的。

tarball 重切:sha256 → e6664cfe…,CN 容器 tag → 1.56.1-7。

五个示例 × 两条工具链全绿。

Author: Sunrisepeak

.agents/docs/2026-08-30-graphics-stack-coverage-design.md

@@ -2261,7 +2261,16 @@ error: xlings install_packages failed … with 2 index repos configured
 ⚠️ 我一度反过来做了(先把 pango 的变通删掉),两边都红。**代码是对的,次序是
 错的**;已经回滚并把这段理由写进了 `gnome.pangocairo` 的描述符,免得下次再犯。
 
-### 23.6 结果
+### 23.6 收尾:pango 随后切过来
+
+cairo 落地后,`gnome.pangocairo` 的 `cairo.h` 变通**已经删掉**,改成普通的
+`export import cairo;`。两侧都绿。
+
+> **代码是对的,次序错了,两边都红。** 这不是本 fork 的问题,是索引机制的形状:
+> 一个成员只能声明一个项目级 index repo,所以跨 namespace 的联动改动**必须**分两
+> 次落地,而且顺序唯一。
+
+### 23.7 结果
 
 | | |
 |---|---|

pkgs/p/gnome.pango.lua

@@ -84,14 +84,14 @@ package = {
             ["1.56.1"] = {
                 url = {
                     GLOBAL = "https://github.com/mcpplibs/pango/archive/refs/tags/1.56.1.tar.gz",
-                    -- ⚠️ The container tag is `1.56.1-6`, not `1.56.1`. gitcode
+                    -- ⚠️ The container tag is `1.56.1-7`, not `1.56.1`. gitcode
                     -- refuses to REPLACE an asset of the same name in an
                     -- existing release, so each corrected tarball needs a new
                     -- container tag while the PACKAGE version stays upstream's.
                     -- Verified byte-identical to the GLOBAL tag archive.
-                    CN     = "https://gitcode.com/mcpp-res/pango/releases/download/1.56.1-6/pango-1.56.1.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/pango/releases/download/1.56.1-7/pango-1.56.1.tar.gz",
                 },
-                sha256 = "19507c6712304750a0e9cc282135dda1919a1b89c0c4ce61e22411df0532a980",
+                sha256 = "e6664cfefd58df72ea59b529527088e0efb5418c2eb59510f33742591c810429",
             },
         },
     },

pkgs/p/gnome.pangocairo.lua

@@ -31,19 +31,19 @@
 --
 -- It surfaced here because pangocairo CANNOT mix the two routes
 -- (`pangocairo.h` reaches glib and therefore <stdio.h>), so it had to ask the
--- module for `cairo_t` and got nothing. This package therefore scans cairo.h
--- itself.
+-- module for `cairo_t` and got nothing. This package carried a workaround —
+-- scanning cairo.h itself — for two releases; it is GONE, and it re-exports
+-- the `cairo` module plainly.
 --
--- ⚠️ THAT WORKAROUND STAYS UNTIL cairo's FIX IS PUBLISHED, not merely written.
--- It is fixed in `1.18.2-mcpp3` (697 names), but this package resolves cairo
--- from the PUBLISHED index — and the change cannot even be TESTED in one index
--- PR, because a member may declare only ONE project-level index repo:
+-- ⚠️ THE ORDER WAS THE HARD PART, not the code. The workaround could not be
+-- removed in the same change that fixed cairo: this package resolves cairo
+-- from the PUBLISHED index, and a member may declare only ONE project-level
+-- index repo —
 --
 --     error: ≥2 project-level index repos is a known xlings resolution gap
 --
 -- so an example cannot use a local `gnome.*` descriptor and a local
--- `freedesktop.*` descriptor at the same time. cairo lands first; this
--- follows.--
+-- `freedesktop.*` descriptor together. cairo landed first; this follows.--
 -- ─────────────────────────────────────────────────────────────────────────
 -- ⭐ TWO WAYS TO CONSUME IT, AND YOU PICK ONE
 --
@@ -106,14 +106,14 @@ package = {
             ["1.56.1"] = {
                 url = {
                     GLOBAL = "https://github.com/mcpplibs/pango/archive/refs/tags/1.56.1.tar.gz",
-                    -- ⚠️ The container tag is `1.56.1-6`, not `1.56.1`. gitcode
+                    -- ⚠️ The container tag is `1.56.1-7`, not `1.56.1`. gitcode
                     -- refuses to REPLACE an asset of the same name in an
                     -- existing release, so each corrected tarball needs a new
                     -- container tag while the PACKAGE version stays upstream's.
                     -- Verified byte-identical to the GLOBAL tag archive.
-                    CN     = "https://gitcode.com/mcpp-res/pango/releases/download/1.56.1-6/pango-1.56.1.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/pango/releases/download/1.56.1-7/pango-1.56.1.tar.gz",
                 },
-                sha256 = "19507c6712304750a0e9cc282135dda1919a1b89c0c4ce61e22411df0532a980",
+                sha256 = "e6664cfefd58df72ea59b529527088e0efb5418c2eb59510f33742591c810429",
             },
         },
     },

pkgs/p/gnome.pangoft2.lua

@@ -68,14 +68,14 @@ package = {
             ["1.56.1"] = {
                 url = {
                     GLOBAL = "https://github.com/mcpplibs/pango/archive/refs/tags/1.56.1.tar.gz",
-                    -- ⚠️ The container tag is `1.56.1-6`, not `1.56.1`. gitcode
+                    -- ⚠️ The container tag is `1.56.1-7`, not `1.56.1`. gitcode
                     -- refuses to REPLACE an asset of the same name in an
                     -- existing release, so each corrected tarball needs a new
                     -- container tag while the PACKAGE version stays upstream's.
                     -- Verified byte-identical to the GLOBAL tag archive.
-                    CN     = "https://gitcode.com/mcpp-res/pango/releases/download/1.56.1-6/pango-1.56.1.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/pango/releases/download/1.56.1-7/pango-1.56.1.tar.gz",
                 },
-                sha256 = "19507c6712304750a0e9cc282135dda1919a1b89c0c4ce61e22411df0532a980",
+                sha256 = "e6664cfefd58df72ea59b529527088e0efb5418c2eb59510f33742591c810429",
             },
         },
     },