[db] update repo cache right after new repo got added

so we can use the new repo right away without waiting for DB to inform us about change. This is important if we want to show list of apps of a repo right after adding it.

libs/database/src/main/java/org/fdroid/index/RepoManager.kt

@@ -143,7 +143,13 @@ public class RepoManager @JvmOverloads constructor(
     @AnyThread
     public fun addFetchedRepository() {
         GlobalScope.launch(coroutineContext) {
-            repoAdder.addFetchedRepository()
+            val addedRepo = repoAdder.addFetchedRepository()
+            // if repo was added, update state right away, so it becomes available asap
+            if (addedRepo != null) withContext(Dispatchers.Main) {
+                _repositoriesState.value = _repositoriesState.value.toMutableList().apply {
+                    add(addedRepo)
+                }
+            }
         }
     }
 

libs/database/src/main/java/org/fdroid/repo/RepoAdder.kt

@@ -217,9 +217,9 @@ internal class RepoAdder(
     }
 
     @WorkerThread
-    internal fun addFetchedRepository() {
+    internal fun addFetchedRepository(): Repository? {
         // prevent double calls (e.g. caused by double tapping a UI button)
-        if (addRepoState.compareAndSet(Adding, Adding)) return
+        if (addRepoState.compareAndSet(Adding, Adding)) return null
 
         // cancel fetch preview job, so it stops emitting new states
         fetchJob?.cancel()
@@ -265,6 +265,7 @@ internal class RepoAdder(
             }
         }
         addRepoState.value = Added(modifiedRepo)
+        return modifiedRepo
     }
 
     internal fun abortAddingRepo() {