Anchor log collapse at the current viewport

app/src/main/java/se/ajpanton/notificationlog/ViewLogsFragment.kt

@@ -123,8 +123,8 @@ class ViewLogsFragment : Fragment(R.layout.fragment_view_logs) {
             val metadata = metadataValues(row.entry, settings)
             val contents = fieldValue(LogField.CONTENTS, row.entry, settings)
             val hasContents = LogField.CONTENTS in settings.visibleFields && !contents.isNullOrEmpty()
-            val collapseAnchor = if (expanded) captureCollapseAnchor(this@apply) else null
             val toggleExpanded = {
+                val collapseAnchor = if (expanded) captureCollapseAnchor(this@apply) else null
                 if (!expandedIds.add(row.entry.id)) expandedIds.remove(row.entry.id)
                 renderExpanded(row.entry.id in expandedIds)
                 collapseAnchor?.let(::restoreCollapseAnchor)

test-helper/src/main/java/se/ajpanton/notificationlog/helper/MainActivity.kt

@@ -50,6 +50,7 @@ class MainActivity : AppCompatActivity() {
             "image" -> postImage()
             "dismissible" -> postDismissible()
             "big_text" -> postBigText()
+            "very_long_text" -> postVeryLongText()
             "inbox" -> postInbox()
             "progress" -> postProgress(25)
             "progress_update" -> postProgress(75)
@@ -83,6 +84,15 @@ class MainActivity : AppCompatActivity() {
 
     private fun postBigText() = manager.notify(BIG_TEXT_ID, base().setStyle(Notification.BigTextStyle().bigText("A long notification body used to exercise Notification.EXTRA_BIG_TEXT.".repeat(3))).build())
 
+    private fun postVeryLongText() = manager.notify(
+        VERY_LONG_TEXT_ID,
+        base().setStyle(
+            Notification.BigTextStyle().bigText(
+                "A deliberately very long notification body used to exercise scrolling and collapse anchoring. ".repeat(180),
+            ),
+        ).build(),
+    )
+
     private fun postInbox() = manager.notify(INBOX_ID, base().setStyle(Notification.InboxStyle().addLine("First inbox line").addLine("Second inbox line")).build())
 
     private fun postProgress(progress: Int) = manager.notify(PROGRESS_ID, base().setContentTitle("Download").setContentText("$progress% complete").setOnlyAlertOnce(true).setProgress(100, progress, false).build())
@@ -105,6 +115,7 @@ class MainActivity : AppCompatActivity() {
         const val MESSAGING_ID = 3
         const val DISMISSIBLE_ID = 4
         const val BIG_TEXT_ID = 5
+        const val VERY_LONG_TEXT_ID = 13
         const val INBOX_ID = 6
         const val PROGRESS_ID = 7
         const val CHRONOMETER_ID = 8
@@ -116,6 +127,7 @@ class MainActivity : AppCompatActivity() {
         val ACTIONS = listOf(
             "Post text" to "post_text", "Edit text" to "edit_text", "Post messaging" to "messaging",
             "Post image" to "image", "Post dismissible" to "dismissible", "Post big text" to "big_text",
+            "Post very long text" to "very_long_text",
             "Post inbox" to "inbox", "Post progress" to "progress", "Update progress" to "progress_update",
             "Post chronometer" to "chronometer", "Post timeout" to "timeout", "Post group" to "group",
             "Cancel text" to "cancel_text", "Cancel all" to "cancel_all",