Fine-tune Renovate auto-merge for layoutlib (cashapp#1169)

Co-authored-by: John Rodriguez <[email protected]>

renovate.json5

@@ -11,7 +11,7 @@
       "automerge": true,
     },
     {
-      description: "Compose compiler is tightly coupled to Kotlin version",
+      "description": "Compose compiler is tightly coupled to Kotlin version.",
       "groupName": "Kotlin and Compose",
       "matchPackagePrefixes": [
         "androidx.compose.compiler",
@@ -21,14 +21,22 @@
       "automerge": false,
     },
     {
-      description: "Android Gradle Plugin is tightly coupled to its android/platform/tools/base dependencies",
+      "description": "Android Gradle Plugin is tightly coupled to its android/platform/tools/base dependencies.",
       "groupName": "Android Tools",
       "matchPackagePrefixes": [
         "com.android.tools:",
         "com.android.tools.build:",
-        // LayoutLib intentionally omitted to be updated independently
+        // LayoutLib intentionally omitted to be updated independently.
       ],
       "automerge": false,
-    }
+    },
+    {
+      "description": "LayoutLib shouldn't auto-merge, because updating it is a complex process, see libs/README.md.",
+      "matchPackagePrefixes": [
+        "app.cash.paparazzi:layoutlib-",
+        "com.android.tools.layoutlib:layoutlib-api",
+      ],
+      "automerge": false,
+    },
   ],
 }