ci: desktop snapshots render animations at their end (#7916)

* ci: desktop snapshots render animations at their end

* ci: re-record the desktop snapshots of the loading link preview

apps/multiplatform/common/src/desktopTest/kotlin/chat/simplex/app/LayoutRecorder.kt

@@ -3,6 +3,7 @@ package chat.simplex.app
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.ImageComposeScene
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.MotionDurationScale
 import androidx.compose.ui.layout.FirstBaseline
 import androidx.compose.ui.layout.LastBaseline
 import androidx.compose.ui.layout.layout
@@ -12,6 +13,7 @@ import androidx.compose.ui.unit.Constraints
 import androidx.compose.ui.unit.Density
 import androidx.compose.ui.unit.LayoutDirection
 import androidx.compose.ui.use
+import kotlinx.coroutines.Dispatchers
 import org.jetbrains.skia.Image
 import kotlin.math.roundToInt
 
@@ -27,8 +29,12 @@ fun Modifier.fixed(width: Int, height: Int, baseline: Int?): Modifier = layout {
   layout(width, height, if (baseline == null) emptyMap() else mapOf(FirstBaseline to baseline, LastBaseline to baseline)) { placeable.place(0, 0) }
 }
 
+private object InstantMotion : MotionDurationScale {
+  override val scaleFactor = 0f
+}
+
 fun renderScene(direction: LayoutDirection = LayoutDirection.Ltr, width: Int = 400, height: Int = 400, frames: Int = 1, content: @Composable () -> Unit): Image =
-  ImageComposeScene(width = width, height = height, density = Density(1f), layoutDirection = direction, content = content).use { scene ->
+  ImageComposeScene(width = width, height = height, density = Density(1f), layoutDirection = direction, coroutineContext = Dispatchers.Unconfined + InstantMotion, content = content).use { scene ->
     (0 until frames).map { scene.render(it * 1_000_000_000L) }.last()
   }
 

scripts/ci/desktop-linux/README.md

@@ -31,7 +31,7 @@ Queueing for a runner adds from under a minute to 20 minutes. Results are artifa
 
 ## Snapshots
 
-`:common:desktopTest` runs `SnapshotTest` (`apps/multiplatform/common/src/desktopTest/kotlin/chat/simplex/app/SnapshotTest.kt`). It renders each preview listed in `previewScenes` with Compose's `ImageComposeScene`, 402 dp wide at density 1, one pixel per dp, as tall as the preview's content up to 874 dp, so a preview that fills any height is 874 pixels tall. It renders the light and dark themes without a wallpaper, over the theme's background, and keeps the fourth frame, 3 s of frame time after the first. As the app does for its screens, the test provides an `AppBarHandler` (`LocalAppBarHandler`) and the window state (`simplexWindowState`, sized as the scene). Each preview is rendered at the default font size; the chat item previews (package `views.chat.item`) also at 1.4 and 1.5, the two largest values of the desktop app's font size setting.
+`:common:desktopTest` runs `SnapshotTest` (`apps/multiplatform/common/src/desktopTest/kotlin/chat/simplex/app/SnapshotTest.kt`). It renders each preview listed in `previewScenes` with Compose's `ImageComposeScene`, 402 dp wide at density 1, one pixel per dp, as tall as the preview's content up to 874 dp, so a preview that fills any height is 874 pixels tall. It renders the light and dark themes without a wallpaper, over the theme's background, and keeps the fourth frame, 3 s of frame time after the first. The scene's coroutine context sets the animation duration scale (`MotionDurationScale`) to 0, so each animation ends at its first frame and a spinner is drawn the same in every run. As the app does for its screens, the test provides an `AppBarHandler` (`LocalAppBarHandler`) and the window state (`simplexWindowState`, sized as the scene). Each preview is rendered at the default font size; the chat item previews (package `views.chat.item`) also at 1.4 and 1.5, the two largest values of the desktop app's font size setting.
 
 `everyPreviewIsRendered` reads the Kotlin sources of `commonMain` and `desktopMain` without comments, and fails when a `@Preview` function is missing from both `previewScenes` and `previewsCallingCore`, or when either names a function absent from the sources; a scene is named `<file>.<function>`. `previewsCallingCore` lists the previews whose layouts validate names or descriptions with the core library (`chatValidName`, `chatJsonLength`), which the test JVM does not load, so they are not rendered. The previews of `androidMain` and of the Android app module are left out too, since they use Android APIs.