Keep open tool cards out of groups

PLAN.md

@@ -1129,17 +1129,17 @@ dev-updater (Kotlin 2.4.x, CMP 1.11.x, JDK 21).
 4. **Session screen** — the core:
    - The transcript rendered from the event stream: markdown, inline images,
      tool cards, question cards.
-   - **A run of adjacent tool calls is one collapsed card, except for the
-     call still running and the last call in the transcript** (2026-09-15).
-     What the session is doing right now, or did last, is the one thing worth
-     seeing without opening anything, and a heading counting it hides it. What
-     folds a call back into its run is not finishing but being *overtaken*:
-     anything arriving behind it, a reply included, makes it history, and a
-     session that has run its last command and is composing its answer leaves
-     that command standing until the answer starts. Grouping is a display
-     decision (`groupToolRuns`) and a cut run's pieces are keyed there — the
-     first piece keeps the run's name, since that name is what survives a page
-     of history landing in front of it.
+   - **A run of adjacent tool calls is one collapsed card, except for a call
+     that is still running, open, or last in the transcript** (2026-09-15).
+     What the session is doing right now, did last, or what the reader is
+     looking at is the one thing worth seeing without a heading hiding it.
+     What folds a finished call back into its run is being *overtaken* while
+     closed: anything arriving behind it, a reply included, makes it history,
+     and a session that has run its last command and is composing its answer
+     leaves that command standing until the answer starts. Grouping is a
+     display decision (`groupToolRuns`) and a cut run's pieces are keyed there
+     — the first piece keeps the run's name, since that name is what survives
+     a page of history landing in front of it.
    - **Anything that is a note *about* the conversation rather than a turn in
      it is closed by default** — a tool call, a peer message, a memory note.
      Open-ness is the screen's, never the card's: a card that remembered for

app/androidApp/src/main/kotlin/com/example/aiapp/SessionScreen.kt

@@ -307,8 +307,6 @@ fun SessionScreen(
     // Which runs of adjacent tool calls are open, by the group row's own key, so a group survives
     // more calls arriving after it.
     var expandedGroups by remember { mutableStateOf(setOf<String>()) }
-    // Calls already drawn inside a group, so being folded into one is noticed exactly once each.
-    var everGrouped by remember { mutableStateOf(setOf<String>()) }
     // Which messages from other agents are open, by the seq that identifies their row. Closed by
     // default, which is the rule for anything new in this transcript.
     var expandedNotes by remember { mutableStateOf(setOf<Long>()) }
@@ -412,7 +410,7 @@ fun SessionScreen(
     // arrived, waiting for them to return to the newest end. See [record].
     var held by remember { mutableStateOf(listOf<SeqEvent>()) }
     // What is actually drawn: the transcript with runs of adjacent tool calls folded into one row.
-    val rows = remember(items) { groupToolRuns(items) }
+    val rows = remember(items, expandedTools) { groupToolRuns(items, expandedTools) }
     // Bumped when a cold reply's parses become ready, so the flatten runs again and can split it.
     var warmedTick by remember { mutableIntStateOf(0) }
     val units =
@@ -609,7 +607,7 @@ fun SessionScreen(
      * Computed from `items` rather than `rows` for the reason [loadOlderPage] gives.
      */
     fun anchorRow(seq: Long): Long? {
-        val ordered = groupToolRuns(items)
+        val ordered = groupToolRuns(items, expandedTools)
         val at = ordered.indexOfLast { it.startSeq <= seq }
         // Zero is the oldest loaded row, which is the half-row above; not found is -1.
         return if (at > 0) ordered[at].startSeq else null
@@ -702,25 +700,6 @@ fun SessionScreen(
         }
     }
 
-    // A call opened on its own stays open when it is folded into a group -- either because a second
-    // call in the same run arrived, or because something landed behind the last call and it
-    // rejoined the run it was standing outside of. Until this, watching a Bash call and having the
-    // session make another one shut the one being read and folded it behind "Called 2 tools".
-    //
-    // Per call rather than per group, because a group outlives the calls joining it: considered at
-    // the moment each call first lands inside one, and never again, so the reader who then shuts
-    // the group has shut it.
-    LaunchedEffect(rows) {
-        val fresh =
-            rows.filterIsInstance<TranscriptRow.Tools>().flatMap { group ->
-                group.calls.filter { it.id !in everGrouped }.map { group.key to it.id }
-            }
-        if (fresh.isEmpty()) return@LaunchedEffect
-        expandedGroups =
-            expandedGroups + fresh.filter { it.second in expandedTools }.map { it.first }
-        everGrouped = everGrouped + fresh.map { it.second }
-    }
-
     // A compaction reports nothing about its own progress -- measured against the CLI, which says
     // it has started and then nothing at all until it is done. So what this counts is the one thing
     // anybody here can measure: how long it has been going. A bar filling up would be this screen

app/androidApp/src/main/kotlin/com/example/aiapp/ToolRows.kt

@@ -97,15 +97,20 @@ sealed class TranscriptRow {
  * A single call is left alone: "Called 1 tool" hides a card to say the same thing in more words,
  * and the run this exists for is the burst of five greps nobody wants to scroll past.
  *
- * The last call is left alone too, and so is one still running wherever in its run it sits. What
- * the session is doing, or did last, is the one thing worth seeing without opening anything, and a
- * heading counting it hides it. What folds a call back into its run is therefore not finishing but
- * being overtaken: anything arriving behind it, a reply included, makes it history.
+ * The last call is left alone too, as is one still running or one the reader has open, wherever in
+ * its run it sits. What the session is doing, did last, or is being read is the one thing worth
+ * seeing without a heading hiding it. A finished call therefore folds back into its run only once
+ * it has been overtaken and is closed.
  */
-fun groupToolRuns(items: List<TranscriptItem>): List<TranscriptRow> =
-    DebugStats.timed("grouped tool runs") { groupRuns(items) }
+fun groupToolRuns(
+    items: List<TranscriptItem>,
+    expandedTools: Set<String> = emptySet(),
+): List<TranscriptRow> = DebugStats.timed("grouped tool runs") { groupRuns(items, expandedTools) }
 
-private fun groupRuns(items: List<TranscriptItem>): List<TranscriptRow> {
+private fun groupRuns(
+    items: List<TranscriptItem>,
+    expandedTools: Set<String>,
+): List<TranscriptRow> {
     val rows = mutableListOf<TranscriptRow>()
     var run = mutableListOf<TranscriptItem.ToolRun>()
     // The run being walked, and how many rows it has produced so far -- which is what decides the
@@ -143,9 +148,9 @@ private fun groupRuns(items: List<TranscriptItem>): List<TranscriptRow> {
         when {
             call == null -> rows += TranscriptRow.Single(item)
             // Standing outside the run is the call's place in the list as it is now, not something
-            // recorded on the call: the same finished call is a row of its own while it is the last
-            // thing that happened and part of its group once a reply lands behind it.
-            call.done && index != items.lastIndex -> run += call
+            // recorded on the call: the same finished call is a row of its own while it is last or
+            // open, and part of its group once something follows it and the reader closes it.
+            call.done && call.id !in expandedTools && index != items.lastIndex -> run += call
             else -> {
                 flush()
                 run += call

app/androidApp/src/test/kotlin/com/example/aiapp/ToolRowsTest.kt

@@ -5,10 +5,9 @@ import kotlin.test.assertEquals
 import kotlin.test.assertTrue
 
 /**
- * How a run of tool calls is cut into rows: the call still running and the last call in the
- * transcript are drawn on their own, and every piece the cut leaves behind still has a key of its
- * own -- two rows sharing one key take the app down, and a key that moves takes the reader's place
- * with it.
+ * How a run of tool calls is cut into rows: a call still running, open, or last in the transcript
+ * is drawn on its own, and every piece the cut leaves behind still has a key of its own -- two rows
+ * sharing one key take the app down, and a key that moves takes the reader's place with it.
  */
 class ToolRowsTest {
     private var seq = 0L
@@ -75,6 +74,30 @@ class ToolRowsTest {
         assertKeysDistinct(rows)
     }
 
+    @Test
+    fun an_open_call_stays_out_of_its_group_until_it_is_closed() {
+        val calls =
+            listOf(
+                call("a"),
+                call("b", runId = "a"),
+                call("c", runId = "a"),
+                call("d", runId = "a"),
+                reply(),
+            )
+
+        val whileOpen = groupToolRuns(calls, expandedTools = setOf("b"))
+        val afterItCloses = groupToolRuns(calls)
+
+        assertEquals(
+            listOf(listOf("a"), listOf("b"), listOf("c", "d"), listOf("reply")),
+            shape(whileOpen),
+        )
+        assertTrue(whileOpen[1] is TranscriptRow.Single, "$whileOpen")
+        assertKeysDistinct(whileOpen)
+        assertEquals(listOf(listOf("a", "b", "c", "d"), listOf("reply")), shape(afterItCloses))
+        assertTrue(afterItCloses.first() is TranscriptRow.Tools, "$afterItCloses")
+    }
+
     /**
      * The one case where the run's name is a call that is not in the run's first row: a page of
      * history joined onto a run whose own first call is still going ([joinPages] renames the older