put the download indicator on the artist line, tight to its left

The glyph and the progress ring sat in the title row after the star, spaced 8dp;
they now lead the subtitle row, 4dp from the artist name, which is where the
artist line has room for them. `theDownloadedIndicatorSitsOnTheArtistLineToItsLeft`
measures the unmerged bounds and fails if the indicator moves back up to the
title line or to the artist's right.

app/src/main/kotlin/com/subtracks/ui/library/SongsContent.kt

@@ -89,16 +89,21 @@ fun SongRow(
                     modifier = Modifier.weight(1f, fill = false),
                 )
                 StarredBadge(song.starred != null)
-                DownloadBadge(download)
             }
         },
         supportingContent = {
-            Text(
-                text = song.artist.orEmpty().ifEmpty { "\u00A0" },
-                color = if (isPlaying) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurfaceVariant,
-                maxLines = 1,
-                overflow = TextOverflow.Ellipsis,
-            )
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(4.dp),
+            ) {
+                DownloadBadge(download)
+                Text(
+                    text = song.artist.orEmpty().ifEmpty { "\u00A0" },
+                    color = if (isPlaying) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurfaceVariant,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+            }
         },
         colors = ListItemDefaults.colors(containerColor = Color.Transparent),
     )

app/src/test/kotlin/com/subtracks/ui/library/SongRowDownloadTest.kt

@@ -5,15 +5,18 @@ import androidx.compose.ui.test.assertIsDisplayed
 import androidx.compose.ui.test.junit4.v2.createAndroidComposeRule
 import androidx.compose.ui.test.onNodeWithContentDescription
 import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.unit.dp
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import com.subtracks.data.model.DownloadStatus
 import com.subtracks.data.model.Song
 import com.subtracks.data.model.SongDownload
 import com.subtracks.ui.theme.SubtracksTheme
+import org.junit.Assert.assertTrue
 import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.robolectric.annotation.GraphicsMode
+import kotlin.math.abs
 
 @RunWith(AndroidJUnit4::class)
 @GraphicsMode(GraphicsMode.Mode.NATIVE)
@@ -60,6 +63,18 @@ class SongRowDownloadTest {
         composeRule.onNodeWithContentDescription("Downloaded").assertDoesNotExist()
     }
 
+    @Test
+    fun theDownloadedIndicatorSitsOnTheArtistLineToItsLeft() {
+        render(download(DownloadStatus.Completed))
+
+        val badge = composeRule.onNodeWithContentDescription("Downloaded", useUnmergedTree = true).fetchSemanticsNode().boundsInRoot
+        val artist = composeRule.onNodeWithText("Artist", useUnmergedTree = true).fetchSemanticsNode().boundsInRoot
+
+        assertTrue("expected the indicator left of the artist name, badge=$badge artist=$artist", badge.right <= artist.left)
+        val offBy = abs(badge.center.y - artist.center.y)
+        assertTrue("expected the indicator on the artist's line, off by ${offBy}px", offBy <= with(composeRule.density) { 2.dp.toPx() })
+    }
+
     private fun download(status: DownloadStatus) =
         SongDownload(sourceId = 1, songId = "s1", status = status, engineId = 7, bytes = 40, total = 100)