Add Quantity Badge to Upcoming Screen (#1250)

Co-authored-by: AntsyLich <59261191+AntsyLich@users.noreply.github.com>
(cherry picked from commit 6b2bba4e5495274552787adc20db390a89d783b6)

app/src/main/java/eu/kanade/core/util/CollectionUtils.kt

@@ -5,7 +5,7 @@ import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 
 fun <T : R, R : Any> List<T>.insertSeparators(
-    generator: (T?, T?) -> R?,
+    generator: (before: T?, after: T?) -> R?,
 ): List<R> {
     if (isEmpty()) return emptyList()
     val newList = mutableListOf<R>()
@@ -19,6 +19,24 @@ fun <T : R, R : Any> List<T>.insertSeparators(
     return newList
 }
 
+/**
+ * Similar to [eu.kanade.core.util.insertSeparators] but iterates from last to first element
+ */
+fun <T : R, R : Any> List<T>.insertSeparatorsReversed(
+    generator: (before: T?, after: T?) -> R?,
+): List<R> {
+    if (isEmpty()) return emptyList()
+    val newList = mutableListOf<R>()
+    for (i in size downTo 0) {
+        val after = getOrNull(i)
+        after?.let(newList::add)
+        val before = getOrNull(i - 1)
+        val separator = generator.invoke(before, after)
+        separator?.let(newList::add)
+    }
+    return newList.asReversed()
+}
+
 fun <E> HashSet<E>.addOrRemove(value: E, shouldAdd: Boolean) {
     if (shouldAdd) {
         add(value)