Prevent unofficial exts from getting marked as obsolete or updateable (#7871)

* Prevent unofficial exts from getting marked as obsolete

* Prevent unofficial ext `hasUpdate` getting marked as true

app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt

@@ -184,7 +184,7 @@ class ExtensionManager(
             val pkgName = installedExt.pkgName
             val availableExt = availableExtensions.find { it.pkgName == pkgName }
 
-            if (availableExt == null && !installedExt.isObsolete) {
+            if (!installedExt.isUnofficial && availableExt == null && !installedExt.isObsolete) {
                 mutInstalledExtensions[index] = installedExt.copy(isObsolete = true)
                 changed = true
             } else if (availableExt != null) {

app/src/main/java/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt

@@ -80,7 +80,7 @@ internal class ExtensionGithubApi {
             val pkgName = installedExt.pkgName
             val availableExt = extensions.find { it.pkgName == pkgName } ?: continue
 
-            val hasUpdate = availableExt.versionCode > installedExt.versionCode
+            val hasUpdate = installedExt.isUnofficial.not() && (availableExt.versionCode > installedExt.versionCode)
             if (hasUpdate) {
                 extensionsWithUpdate.add(installedExt)
             }