Two quick helpers for testing statics (#634)

Not great, but better than we have.

Author: JakeWharton

mosaic-runtime/api/mosaic-runtime.api

@@ -4,6 +4,7 @@ public abstract interface class com/jakewharton/mosaic/Mosaic {
 	public abstract fun dump ()Ljava/lang/String;
 	public abstract fun getTerminalState ()Landroidx/compose/runtime/MutableState;
 	public abstract fun paint ()Lcom/jakewharton/mosaic/TextCanvas;
+	public fun paintStatics ()Ljava/util/List;
 	public abstract fun paintStaticsTo (Landroidx/collection/MutableObjectList;)V
 	public abstract fun sendKeyEvent (Lcom/jakewharton/mosaic/layout/KeyEvent;)V
 	public abstract fun setContent (Lkotlin/jvm/functions/Function2;)V

mosaic-runtime/api/mosaic-runtime.klib.api

@@ -207,6 +207,7 @@ abstract interface com.jakewharton.mosaic/Mosaic { // com.jakewharton.mosaic/Mos
     abstract fun sendKeyEvent(com.jakewharton.mosaic.layout/KeyEvent) // com.jakewharton.mosaic/Mosaic.sendKeyEvent|sendKeyEvent(com.jakewharton.mosaic.layout.KeyEvent){}[0]
     abstract fun setContent(kotlin/Function2<androidx.compose.runtime/Composer, kotlin/Int, kotlin/Unit>) // com.jakewharton.mosaic/Mosaic.setContent|setContent(kotlin.Function2<androidx.compose.runtime.Composer,kotlin.Int,kotlin.Unit>){}[0]
     abstract suspend fun awaitComplete() // com.jakewharton.mosaic/Mosaic.awaitComplete|awaitComplete(){}[0]
+    open fun paintStatics(): kotlin.collections/List<com.jakewharton.mosaic/TextCanvas> // com.jakewharton.mosaic/Mosaic.paintStatics|paintStatics(){}[0]
 }
 
 abstract interface com.jakewharton.mosaic/TextCanvas { // com.jakewharton.mosaic/TextCanvas|null[0]

mosaic-runtime/src/commonMain/kotlin/com/jakewharton/mosaic/mosaic.kt

@@ -1,6 +1,7 @@
 package com.jakewharton.mosaic
 
 import androidx.collection.MutableObjectList
+import androidx.collection.mutableObjectListOf
 import androidx.collection.mutableScatterSetOf
 import androidx.compose.runtime.AbstractApplier
 import androidx.compose.runtime.BroadcastFrameClock
@@ -163,6 +164,12 @@ public interface Mosaic {
 
 	public fun paint(): TextCanvas
 	public fun paintStaticsTo(list: MutableObjectList<TextCanvas>)
+	public fun paintStatics(): List<TextCanvas> {
+		return mutableObjectListOf<TextCanvas>()
+			.apply(::paintStaticsTo)
+			.asList()
+	}
+
 	public fun dump(): String
 
 	public suspend fun awaitComplete()

mosaic-testing/api/mosaic-testing.api

@@ -1,3 +1,10 @@
+public final class com/jakewharton/mosaic/testing/MosaicSnapshots : com/jakewharton/mosaic/testing/SnapshotStrategy {
+	public static final field $stable I
+	public static final field INSTANCE Lcom/jakewharton/mosaic/testing/MosaicSnapshots;
+	public fun create (Lcom/jakewharton/mosaic/Mosaic;)Lcom/jakewharton/mosaic/Mosaic;
+	public synthetic fun create (Lcom/jakewharton/mosaic/Mosaic;)Ljava/lang/Object;
+}
+
 public abstract interface class com/jakewharton/mosaic/testing/SnapshotStrategy {
 	public abstract fun create (Lcom/jakewharton/mosaic/Mosaic;)Ljava/lang/Object;
 }

mosaic-testing/api/mosaic-testing.klib.api

@@ -14,8 +14,14 @@ abstract interface <#A: kotlin/Any?> com.jakewharton.mosaic.testing/TestMosaic :
     abstract suspend fun awaitSnapshot(kotlin.time/Duration = ...): #A // com.jakewharton.mosaic.testing/TestMosaic.awaitSnapshot|awaitSnapshot(kotlin.time.Duration){}[0]
 }
 
+final object com.jakewharton.mosaic.testing/MosaicSnapshots : com.jakewharton.mosaic.testing/SnapshotStrategy<com.jakewharton.mosaic/Mosaic> { // com.jakewharton.mosaic.testing/MosaicSnapshots|null[0]
+    final fun create(com.jakewharton.mosaic/Mosaic): com.jakewharton.mosaic/Mosaic // com.jakewharton.mosaic.testing/MosaicSnapshots.create|create(com.jakewharton.mosaic.Mosaic){}[0]
+}
+
+final val com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_MosaicSnapshots$stableprop // com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_MosaicSnapshots$stableprop|#static{}com_jakewharton_mosaic_testing_MosaicSnapshots$stableprop[0]
 final val com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop // com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop|#static{}com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop[0]
 
+final fun com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_MosaicSnapshots$stableprop_getter(): kotlin/Int // com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_MosaicSnapshots$stableprop_getter|com_jakewharton_mosaic_testing_MosaicSnapshots$stableprop_getter(){}[0]
 final fun com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop_getter(): kotlin/Int // com.jakewharton.mosaic.testing/com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop_getter|com_jakewharton_mosaic_testing_PlainTextSnapshots$stableprop_getter(){}[0]
 final suspend fun <#A: kotlin/Any?, #B: kotlin/Any?> com.jakewharton.mosaic.testing/runMosaicTest(com.jakewharton.mosaic.testing/SnapshotStrategy<#A>, kotlin.coroutines/SuspendFunction1<com.jakewharton.mosaic.testing/TestMosaic<#A>, #B>): #B // com.jakewharton.mosaic.testing/runMosaicTest|runMosaicTest(com.jakewharton.mosaic.testing.SnapshotStrategy<0:0>;kotlin.coroutines.SuspendFunction1<com.jakewharton.mosaic.testing.TestMosaic<0:0>,0:1>){0§<kotlin.Any?>;1§<kotlin.Any?>}[0]
 final suspend fun com.jakewharton.mosaic.testing/runMosaicTest(kotlin.coroutines/SuspendFunction1<com.jakewharton.mosaic.testing/TestMosaic<kotlin/String>, kotlin/Unit>) // com.jakewharton.mosaic.testing/runMosaicTest|runMosaicTest(kotlin.coroutines.SuspendFunction1<com.jakewharton.mosaic.testing.TestMosaic<kotlin.String>,kotlin.Unit>){}[0]

mosaic-testing/src/commonMain/kotlin/com/jakewharton/mosaic/testing/TestMosaic.kt

@@ -14,12 +14,16 @@ import kotlinx.coroutines.currentCoroutineContext
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.withTimeout
 
+public suspend fun runMosaicTest(block: suspend TestMosaic<String>.() -> Unit) {
+	runMosaicTest(PlainTextSnapshots, block)
+}
+
 public fun interface SnapshotStrategy<T> {
 	public fun create(mosaic: Mosaic): T
 }
 
-public suspend fun runMosaicTest(block: suspend TestMosaic<String>.() -> Unit) {
-	runMosaicTest(PlainTextSnapshots, block)
+public object MosaicSnapshots : SnapshotStrategy<Mosaic> {
+	override fun create(mosaic: Mosaic): Mosaic = mosaic
 }
 
 public suspend fun <T, R> runMosaicTest(