Upgrade AGP, Compose, Dokka, and Kotlin.

build.gradle.kts

@@ -38,11 +38,6 @@ subprojects {
         allWarningsAsErrors = true
       }
 
-      // Required while Compose is built on a compiler that is somewhere in between Kotlin
-      // 1.3 and 1.4. Otherwise you'll see errors like "Runtime JAR file has version 1.3 which
-      // is older than required for API version 1.4"
-      apiVersion = "1.3"
-
       freeCompilerArgs = listOf(
           "-Xopt-in=kotlin.RequiresOptIn"
       )

buildSrc/build.gradle.kts

@@ -9,7 +9,7 @@ repositories {
 }
 
 dependencies {
-  implementation("com.android.tools.build:gradle:7.0.0-alpha14")
-  implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.31")
-  implementation("org.jetbrains.dokka:dokka-gradle-plugin:1.4.0")
+  implementation("com.android.tools.build:gradle:7.1.0-alpha01")
+  implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.32")
+  implementation("org.jetbrains.dokka:dokka-gradle-plugin:1.4.32")
 }

buildSrc/src/main/java/DefaultAndroidConfigPlugin.kt

@@ -22,8 +22,8 @@ class DefaultAndroidConfigPlugin : Plugin<Project> {
       }
 
       defaultConfig {
-        minSdkVersion(21)
-        targetSdkVersion(Versions.targetSdk)
+        minSdk = 21
+        targetSdk = Versions.targetSdk
         versionCode = 1
         versionName = "1.0"
 

buildSrc/src/main/java/Dependencies.kt

@@ -1,11 +1,11 @@
 object Versions {
   const val targetSdk = 29
-  const val compose = "1.0.0-beta05"
+  const val compose = "1.0.0-beta07"
 }
 
 object Dependencies {
   object AndroidX {
-    const val appcompat = "androidx.appcompat:appcompat:1.3.0-beta01"
+    const val appcompat = "androidx.appcompat:appcompat:1.3.0"
 
     // Note that we're not using the actual androidx material dep yet, it's still alpha.
     const val material = "com.google.android.material:material:1.1.0"
@@ -14,7 +14,7 @@ object Dependencies {
   }
 
   object Compose {
-    const val activity = "androidx.activity:activity-compose:1.3.0-alpha02"
+    const val activity = "androidx.activity:activity-compose:1.3.0-alpha08"
     const val foundation = "androidx.compose.foundation:foundation:${Versions.compose}"
     const val icons = "androidx.compose.material:material-icons-extended:${Versions.compose}"
     const val material = "androidx.compose.material:material:${Versions.compose}"

compose-backstack/src/main/java/com/zachklipp/compose/backstack/SaveableScreenStateHolder.kt

@@ -7,6 +7,7 @@ import androidx.compose.runtime.key
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.SaveableStateHolder
 import androidx.compose.runtime.saveable.rememberSaveableStateHolder
+import androidx.compose.ui.layout.SubcomposeLayout
 
 @Composable internal fun <T> rememberSaveableScreenStateHolder(): SaveableScreenStateHolder<T> {
   val stateHolder = rememberSaveableStateHolder()
@@ -62,7 +63,9 @@ internal class SaveableScreenStateHolder<T>(private val holder: SaveableStateHol
     // composed again. We have to use the compose-generated int stateKey, even though this function
     // accepts Any, because it doesn't _actually_ accept Any – it only accepts values that are
     // saveable, and the backstack item may not be saveable.
-    holder.SaveableStateProvider(stateKey, content)
+    holder.SaveableStateProvider(stateKey) {
+      WorkaroundComposeStateBug(content)
+    }
   }
 
   /**
@@ -82,4 +85,18 @@ internal class SaveableScreenStateHolder<T>(private val holder: SaveableStateHol
       }
     }
   }
+
+  /**
+   * TODO Remove this when the bug is fixed.
+   * See https://issuetracker.google.com/issues/188567661#comment2.
+   */
+  @Composable private fun WorkaroundComposeStateBug(content: @Composable () -> Unit) {
+    SubcomposeLayout { constraints ->
+      val measurable = subcompose(Unit, content).single()
+      val placeable = measurable.measure(constraints)
+      layout(placeable.width, placeable.height) {
+        placeable.placeRelative(0, 0)
+      }
+    }
+  }
 }