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fix concurrent-modification in BufferLine anchor iteration

Browse Source 
`removeCells`, `insertCells`, and `dispose` each iterate over
`_anchors` while invoking `anchor.dispose()` on entries inside the
loop — but `dispose()` removes the anchor from the same list, which
shifts later indexes left and causes the for-loop to skip them.

Symptoms (no user-facing report yet, but real correctness bug):
- After `removeCells` with multiple anchors past the start, anchors
  that should be repositioned were silently left at their old `x`.
- After `insertCells` with anchors getting pushed past `_length`,
  ones meant to be disposed could survive.
- `BufferLine.dispose` would throw `ConcurrentModificationError` as
  soon as more than one anchor was attached.

Fix: iterate `_anchors.toList()` (a snapshot) in all three sites.
Cheap, safe, and matches the expected anchor-management semantics.

Surfaced by the unit tests added under T-91; that commit covers the
fix with regression tests.

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
jpmschweitzer
2026-05-06 23:03:03 +02:00
co-authored by Claude
parent eb32396bd4
commit 1d75e8e1cd
2 changed files with 115 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files
.pql/pql-plan.json
+107 -107
View File
@@ -1,5 +1,5 @@
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"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-8",
@@ -721,7 +721,7 @@
"title": "Extension API shape — widgets, subcommands, both?",
"status": "open",
"file_path": "decisions/questions-extensions.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-9",
@@ -730,7 +730,7 @@
"title": "Lua runtime vendoring",
"status": "open",
"file_path": "decisions/questions-extensions.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-10",
@@ -739,7 +739,7 @@
"title": "Extension manifest `schema_version:`",
"status": "open",
"file_path": "decisions/questions-extensions.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-11",
@@ -748,7 +748,7 @@
"title": "Coverage gates — hard thresholds vs soft reporting",
"status": "open",
"file_path": "decisions/questions-testing.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-12",
@@ -757,7 +757,7 @@
"title": "Screen-reader automation (axe-core via Playwright)",
"status": "open",
"file_path": "decisions/questions-testing.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-13",
@@ -766,7 +766,7 @@
"title": "Web production-mode a11y",
"status": "open",
"file_path": "decisions/questions-accessibility.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-14",
@@ -775,7 +775,7 @@
"title": "i18n plurals / gender / date-format tooling",
"status": "open",
"file_path": "decisions/questions-accessibility.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-15",
@@ -784,7 +784,7 @@
"title": "Editor tab — full LSP vs tree-sitter-only highlight",
"status": "open",
"file_path": "decisions/questions-process.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-16",
@@ -793,7 +793,7 @@
"title": "`tree-sitter-dart` grammar maintenance",
"status": "open",
"file_path": "decisions/questions-process.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-17",
@@ -802,7 +802,7 @@
"title": "Icon set growth",
"status": "open",
"file_path": "decisions/questions-process.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-18",
@@ -811,7 +811,7 @@
"title": "Theme hot-reload in release builds",
"status": "open",
"file_path": "decisions/questions-process.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-19",
@@ -820,7 +820,7 @@
"title": "(withdrawn)",
"status": "resolved",
"file_path": "decisions/questions-process.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-20",
@@ -829,7 +829,7 @@
"title": "Kernel DB service — namespaced SQL access?",
"status": "open",
"file_path": "decisions/questions-process.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-21",
@@ -838,7 +838,7 @@
"title": "Pql absorbs planning vs keeps separate",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-22",
@@ -847,7 +847,7 @@
"title": "Ticket persistence strategy",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-23",
@@ -856,7 +856,7 @@
"title": "SSH-remote development — run clide against a remote workspace",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-25",
@@ -865,7 +865,7 @@
"title": "Body text face — mono everywhere vs Josefin Sans UI + mono code",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-26",
@@ -874,7 +874,7 @@
"title": "Small screen layout (\u003c 1000px)",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-27",
@@ -883,7 +883,7 @@
"title": "Two-editor split",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-28",
@@ -892,7 +892,7 @@
"title": "Terminal strip scope — shell only or logs/errors/tests",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-29",
@@ -901,7 +901,7 @@
"title": "Branch picker location",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-30",
@@ -910,7 +910,7 @@
"title": "Focus behavior when editor is dirty and viewer is peeked",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "Q-31",
@@ -919,7 +919,7 @@
"title": "XWayland fallback for frameless — proper Wayland protocol needed",
"status": "open",
"file_path": "decisions/questions-architecture.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-2",
@@ -929,7 +929,7 @@
"status": "active",
"date": "2026-04-20",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-3",
@@ -939,7 +939,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-4",
@@ -949,7 +949,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-5",
@@ -959,7 +959,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-6",
@@ -969,7 +969,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-7",
@@ -979,7 +979,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-8",
@@ -989,7 +989,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-9",
@@ -999,7 +999,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-10",
@@ -1009,7 +1009,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-11",
@@ -1019,7 +1019,7 @@
"status": "active",
"date": "2026-04-21",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
},
{
"id": "R-12",
@@ -1029,7 +1029,7 @@
"status": "active",
"date": "2026-04-22",
"file_path": "decisions/rejected.md",
"synced_at": "2026-05-06 20:54:33"
"synced_at": "2026-05-06 21:00:50"
}
],
"decision_refs": [
lib/src/terminal/src/core/buffer/line.dart
+8 -5
View File
@@ -179,8 +179,9 @@ class BufferLine with IndexedItem {
}
// Update anchors, remove anchors that are inside the removed range.
for (var i = 0; i < _anchors.length; i++) {
final anchor = _anchors[i];
// Iterate over a snapshot — anchor.dispose() removes itself from
// _anchors, so a live for-loop would skip later entries.
for (final anchor in _anchors.toList()) {
if (anchor.x >= start) {
if (anchor.x < start + count) {
anchor.dispose();
@@ -218,8 +219,9 @@ class BufferLine with IndexedItem {
}
// Update anchors, move anchors that are after the inserted range.
for (var i = 0; i < _anchors.length; i++) {
final anchor = _anchors[i];
// Iterate over a snapshot — anchor.dispose() removes itself from
// _anchors, so a live for-loop would skip later entries.
for (final anchor in _anchors.toList()) {
if (anchor.x >= start + count) {
anchor.reposition(anchor.x + count);
@@ -352,7 +354,8 @@ class BufferLine with IndexedItem {
}
void dispose() {
for (final anchor in _anchors) {
// Snapshot — anchor.dispose() removes itself from _anchors.
for (final anchor in _anchors.toList()) {
anchor.dispose();
}
}