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With Restore workspace tabs enabled, reopening a split workspace currently puts all files into one editor group. Restore the split tree, divider proportions, focused group, and each group's tabs, pins, cursors, and scroll positions instead. Two restored views of the same file share one document while keeping their own view state.
Follow-up to the accepted split editor request #706 and the opt-in session feature #1488. This is the final extraction from the combined prototype #1481.
The existing editor.restoreTabs setting stays off by default. Legacy flat tab sessions remain readable; explicit file arguments take precedence. Empty groups reopen with fresh untitled buffers. Unsaved content, undo history, terminals, and plugin tabs are not persisted. The existing per-workspace key and cleanup limits remain: 32 sessions, 128 file views, 30 days, and 1 MiB per session.
Validation: make test, make lint (0 issues), and make build pass. App tests cover nested right/down splits, divider ratios, focus in first/last groups, shared documents with independent views and pins, empty groups, missing files, opt-out, and explicit arguments. Config tests cover legacy sessions, view limits, and malformed trees. A two-process real-binary restart check verifies three groups and identical geometry, focus, paths, and cursor positions after reopening.
Before and after below show the same three-file workspace immediately after restarting at 140×32, captured with --exec screenshot.
Before: restored into one group
File Edit Selection View Options Help
┌──────────────────────────────┐ ┌────────┐
│ Explore Find Changes » ⋮ │ a.go b.go │ c.go ✕ │ ⋮
│──────────────────────────────├────────────┘ └─────────────────────────────────────────────────────────────────────────────────────┐
│⌄ project │ 1 package main █│
│ a.go │ 2 // c.go █│
│ b.go │ 3 // line 1 █│
│ c.go │ 4 // line 2 █│
│ │ 5 // line 3 █│
│ │ 6 // line 4 █│
│ │ 7 // line 5 █│
│ │ 8 // line 6 █│
│ │ 9 // line 7 █│
│ │ 10 // line 8 █│
│ │ 11 // line 9 █│
│ │ 12 // line 10 █│
│ │ 13 // line 11 █│
│ │ 14 // line 12 █│
│ │ 15 // line 13 █│
│ │ 16 // line 14 █│
│ │ 17 // line 15 █│
│ │ 18 // line 16 █│
│ │ 19 // line 17 █│
│ │ 20 // line 18 █│
│ │ 21 // line 19 █│
│ │ 22 // line 20 █│
│ │ 23 // line 21 █│
│ │ 24 // line 22 █│
│ │ 25 // line 23 █│
│ │ 26 // line 24 █│
└──────────────────────────────┴───────────────────────────────────────────────────────────────────────────────────────────────────────────┘
Ln 3, Col 8 Spaces: 4 UTF-8 LF Go```
</details>
<details>
<summary>After: restored original three-group layout</summary>
```text
File Edit Selection View Options Help
┌──────────────────────────────┐┌────────┐ ┌────────┐
│ Explore Find Changes » ⋮ ││ a.go ✕ │ ⋮ │ b.go ✕ │ ⋮
│──────────────────────────────├┘ └───────────────────────────────────────────────────────┬┘ └───────────────────────────────┐
│⌄ project │ 1 package main █│ 1 package main █│
│ a.go │ 2 // a.go █│ 2 // b.go █│
│ b.go │ 3 // line 1 █│ 3 // line 1 █│
│ c.go │ 4 // line 2 █│ 4 // line 2 █│
│ │ 5 // line 3 █│ 5 // line 3 █│
│ │ 6 // line 4 █│ 6 // line 4 █│
│ │ 7 // line 5 █│ 7 // line 5 █│
│ │ 8 // line 6 █│ 8 // line 6 █│
│ │ 9 // line 7 █│ 9 // line 7 █│
│ │ 10 // line 8 █│ 10 // line 8 █│
│ │ 11 // line 9 █│ 11 // line 9 █│
│ │ 12 // line 10 █│ 12 // line 10 █│
│ │ 13 // line 11 █│┌────────┐ │
│ │ 14 // line 12 █││ c.go ✕ │ ⋮ │
│ │ 15 // line 13 █├┘ └───────────────────────────────│
│ │ 16 // line 14 █│ 1 package main █│
│ │ 17 // line 15 █│ 2 // c.go █│
│ │ 18 // line 16 █│ 3 // line 1 █│
│ │ 19 // line 17 █│ 4 // line 2 █│
│ │ 20 // line 18 █│ 5 // line 3 █│
│ │ 21 // line 19 █│ 6 // line 4 █│
│ │ 22 // line 20 █│ 7 // line 5 █│
│ │ 23 // line 21 █│ 8 // line 6 █│
│ │ 24 // line 22 █│ 9 // line 7 █│
│ │ 25 // line 23 █│ 10 // line 8 █│
│ │ 26 // line 24 █│ 11 // line 9 █│
└──────────────────────────────┴─────────────────────────────────────────────────────────────────┴─────────────────────────────────────────┘
Ln 3, Col 8 Spaces: 4 UTF-8 LF Go```
</details>
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
<!-- coderabbit-ai-generated:v1 -->
## Summary by CodeRabbit
* **New Features**
* Workspace restoration brings back split-editor arrangements, divider sizes, and the focused group, along with each group’s tabs, pinned state, cursor positions, and scroll positions.
* Saved layouts can include empty editor groups. Missing files are skipped while the remaining split arrangement is preserved.
* **Documentation**
* Updated editor guides and settings reference to describe the workspace details restored with saved sessions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Built from be466819d5aa. Links expire on Nov 29, 2026.
Try it in the browser (emulated): runs this build in 32-bit Linux emulated inside the page, with no download or sign-in. It is much slower than a native build and is meant for quick checks of behavior and UI, not performance or terminal compatibility. Startup takes up to a minute.
Downloads need a GitHub sign-in and arrive as zips. On Linux and macOS, run chmod +x ttt after unzipping. These binaries run this pull request's code, so only run them if you trust it.
No actionable comments were generated in the recent review.
Walkthrough
Editor sessions now save and restore split layouts, divider ratios, focused groups, and per-group tab state. The session format supports legacy flat tab lists. Loading and saving bound the stored layouts and tabs.
Changes: Workspace session restoration
Layer / File(s)
Summary
Workspace session format and compatibility internal/config/editor_session.go, internal/config/editor_session_layout.go, internal/config/editor_session_layout_test.go, internal/ui/editor_layout.go
Adds a versioned workspace session format with split layouts and group state. The loader supports legacy flat-tab sessions, and layout validation limits the tree to four groups. The flat API returns tabs from layout sessions.
Editor layout snapshot and restoration internal/app/editor_session.go, internal/app/editor_session_layout.go, internal/app/editor_session_layout_test.go, docs-web/src/content/docs/guides/editor.md, docs-web/src/content/docs/reference/settings.md
The editor saves split layouts or regular-file tabs through the workspace session API. Restoration rebuilds split groups and restores valid tabs, view positions, pins, active tabs, and focus. Tests cover restoration cases, and the documentation describes the saved workspace state.
sequenceDiagram
participant Editor
participant persistEditorSession
participant SaveEditorWorkspaceSession
participant restoreEditorSession
participant LoadEditorWorkspaceSession
Editor->>persistEditorSession: Snapshot split layout or regular-file tabs
persistEditorSession->>SaveEditorWorkspaceSession: Save workspace session
restoreEditorSession->>LoadEditorWorkspaceSession: Load workspace session
LoadEditorWorkspaceSession->>restoreEditorSession: Return layout and tab state
restoreEditorSession->>Editor: Restore groups, tabs, view state, and focus
Loading
Possibly related PRs
eugenioenko/ttt#1488: Introduced the workspace tab-session feature and flat-tab storage format that this change extends.
eugenioenko/ttt#1481: Added split editor groups that this change rebuilds during session restoration.
eugenioenko/ttt#1621: Added resizable split groups whose layout and focus state this change restores.
Suggested reviewers:lzcwbcgs
Merge Risk: Minimal · up to be466
This change restores split editor layouts, divider ratios and per-group tabs when tab restoration is enabled. Legacy sessions remain readable. No merge-blocking risk was found in the reviewed changes.
Pre-merge checks: 4
Check name
Status
Explanation
Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title "feat(session): restore editor split layouts" matches the main change. The objectives and the summaries show the PR restores split trees, divider ratios, focused groups, and per-group tabs w…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
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Full details: Title check
Explanation
The title "feat(session): restore editor split layouts" matches the main change. The objectives and the summaries show the PR restores split trees, divider ratios, focused groups, and per-group tabs when editor.restoreTabs is enabled. The title is concise and uses a conventional-commit style prefix.
Finishing Touches
Generate unit tests (beta)
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Reviewing files that changed from the base of the PR and between 9419237 and be46681.
Files selected for processing: 2
internal/app/editor_session_layout.go
internal/app/editor_session_layout_test.go
Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 0 remain after this review.
Comparing adfa9e9109e0 with be466819d5aa on the same runner: fastest of 3 alternating passes at 5x each, -short (2,000-line large file).
Allocated bytes measure total allocation per operation, not peak or retained RAM.
Logs are opened by each side's built ttt binary, 1x per pass, timed from launch until the first frame shows the log; _wrap rows start with word wrap on, and _edit opens a log committed to git, types a character, and moves down 20 lines. Time includes process startup, so the 1 MiB case is mostly startup; peak RSS is the process's maximum resident memory. The 1, 128, and 256 MiB fixtures are generated once outside timing and shared across both checkouts, so reads may use the OS file cache.
Code files open a 64 MiB Go file, this repository's sources repeated, with LSP and the git gutter off; _type also types 20 characters and _enter presses Enter 10 times before quitting.
Editor
Geometric-mean change: time -1.4%, allocated bytes 0.0%, allocations 0.0%.
Click here to see benchmark details
Benchmark
Base
PR
Time change
Base allocs
PR allocs
Allocation change
go/redraw
190 µs
180 µs
-5.3%
35
35
0.0%
go/cursor_down
201 µs
191 µs
-4.8%
37
37
0.0%
go/page_down
986 µs
1.1 ms
+8.7%
3015
3017
+0.1%
go/wheel_scroll
329 µs
310 µs
-5.8%
1507
1507
0.0%
go/type_and_delete
382 µs
361 µs
-5.7%
102
102
0.0%
go/open_large_first
6.7 ms
6.2 ms
-7.0%
48361
48364
0.0%
go/open_large
1.4 ms
1.3 ms
-6.3%
2597
2597
0.0%
go/jump_to_end_large
5.0 ms
4.6 ms
-7.2%
11081
11081
0.0%
go/redraw_git_changes_large
217 µs
206 µs
-5.0%
87
87
0.0%
go/wheel_scroll_git_changes_large
375 µs
337 µs
-10.1%
1570
1570
0.0%
go/type_and_delete_git_changes_large
448 µs
440 µs
-1.9%
217
217
0.0%
go/edit_top_view_end_large
724 µs
795 µs
+9.8%
2814
2814
0.0%
ts/redraw
197 µs
184 µs
-6.5%
37
37
0.0%
ts/cursor_down
208 µs
196 µs
-5.8%
38
38
0.0%
ts/page_down
2.7 ms
2.6 ms
-4.9%
13519
13519
0.0%
ts/wheel_scroll
1.4 ms
1.3 ms
-7.3%
12036
12035
0.0%
ts/type_and_delete
394 µs
386 µs
-2.0%
114
114
0.0%
ts/open_large_first
21.2 ms
20.5 ms
-3.4%
204599
204596
0.0%
ts/open_large
2.2 ms
2.1 ms
-6.8%
3870
3869
0.0%
ts/jump_to_end_large
14.5 ms
14.1 ms
-2.4%
62315
62316
0.0%
ts/edit_top_view_end_large
773 µs
795 µs
+2.9%
3411
3411
0.0%
cpp/redraw
208 µs
215 µs
+3.7%
36
36
0.0%
cpp/cursor_down
220 µs
222 µs
+1.1%
38
38
0.0%
cpp/page_down
3.7 ms
3.6 ms
-1.8%
7947
7946
0.0%
cpp/wheel_scroll
758 µs
731 µs
-3.6%
1983
1982
-0.1%
cpp/type_and_delete
403 µs
396 µs
-1.8%
114
114
0.0%
cpp/open_large_first
137.9 ms
136.9 ms
-0.8%
1386879
1386877
0.0%
cpp/open_large
4.2 ms
4.5 ms
+6.2%
5296
5296
0.0%
cpp/jump_to_end_large
26.4 ms
27.1 ms
+2.8%
63510
63515
0.0%
cpp/type_while_catching_up_large
486 µs
509 µs
+4.8%
139
139
0.0%
cpp/edit_top_view_end_large
882 µs
915 µs
+3.7%
4347
4347
0.0%
python/redraw
201 µs
187 µs
-7.4%
37
37
0.0%
python/cursor_down
199 µs
195 µs
-1.8%
38
38
0.0%
python/page_down
1.3 ms
1.3 ms
+1.3%
3430
3430
0.0%
python/wheel_scroll
364 µs
365 µs
+0.2%
1831
1831
0.0%
python/type_and_delete
392 µs
389 µs
-0.8%
113
113
0.0%
python/open_large_first
6.2 ms
6.7 ms
+8.8%
45994
45995
0.0%
python/open_large
1.9 ms
1.9 ms
-1.1%
3623
3623
0.0%
python/jump_to_end_large
7.5 ms
7.6 ms
+1.2%
12857
12858
0.0%
python/edit_top_view_end_large
776 µs
848 µs
+9.3%
4261
4261
0.0%
Benchmark
Base allocated bytes
PR allocated bytes
Change
go/redraw
1587 B
1596 B
+0.6%
go/cursor_down
1659 B
1659 B
0.0%
go/page_down
340780 B
340961 B
+0.1%
go/wheel_scroll
111926 B
111926 B
0.0%
go/type_and_delete
4812 B
4803 B
-0.2%
go/open_large_first
5.8 MiB
5.8 MiB
+0.1%
go/open_large
455435 B
455435 B
0.0%
go/jump_to_end_large
1.5 MiB
1.5 MiB
0.0%
go/redraw_git_changes_large
12675 B
12675 B
0.0%
go/wheel_scroll_git_changes_large
123393 B
123496 B
+0.1%
go/type_and_delete_git_changes_large
28792 B
28792 B
0.0%
go/edit_top_view_end_large
134870 B
134870 B
0.0%
ts/redraw
1859 B
1859 B
0.0%
ts/cursor_down
1793 B
1793 B
0.0%
ts/page_down
1.3 MiB
1.3 MiB
-0.2%
ts/wheel_scroll
1.0 MiB
1.0 MiB
+0.1%
ts/type_and_delete
6590 B
6590 B
0.0%
ts/open_large_first
19.6 MiB
19.6 MiB
-0.1%
ts/open_large
518032 B
515662 B
-0.5%
ts/jump_to_end_large
6.0 MiB
6.0 MiB
0.0%
ts/edit_top_view_end_large
166963 B
166963 B
0.0%
cpp/redraw
1616 B
1616 B
0.0%
cpp/cursor_down
1688 B
1688 B
0.0%
cpp/page_down
876059 B
876088 B
0.0%
cpp/wheel_scroll
155718 B
155321 B
-0.3%
cpp/type_and_delete
5568 B
5568 B
0.0%
cpp/open_large_first
149.5 MiB
149.4 MiB
0.0%
cpp/open_large
703697 B
702673 B
-0.1%
cpp/jump_to_end_large
8.5 MiB
8.6 MiB
+0.1%
cpp/type_while_catching_up_large
9652 B
9652 B
0.0%
cpp/edit_top_view_end_large
254126 B
254126 B
0.0%
python/redraw
1856 B
1856 B
0.0%
python/cursor_down
1732 B
1732 B
0.0%
python/page_down
282291 B
282291 B
0.0%
python/wheel_scroll
100134 B
100134 B
0.0%
python/type_and_delete
6944 B
6944 B
0.0%
python/open_large_first
5.2 MiB
5.2 MiB
+0.1%
python/open_large
516819 B
516712 B
0.0%
python/jump_to_end_large
1.3 MiB
1.3 MiB
0.0%
python/edit_top_view_end_large
210398 B
210398 B
0.0%
Diff views
Geometric-mean change: time -2.7%, allocated bytes 0.0%, allocations 0.0%.
Click here to see benchmark details
Benchmark
Base
PR
Time change
Base allocs
PR allocs
Allocation change
go/split/redraw
196 µs
197 µs
+0.1%
43
43
0.0%
go/split/wheel_scroll
441 µs
423 µs
-4.0%
2792
2793
0.0%
go/split/type_and_delete
431 µs
419 µs
-2.7%
133
133
0.0%
go/split/enter_and_backspace
655 µs
659 µs
+0.6%
2095
2095
0.0%
go/split/page_down
1.1 ms
1.1 ms
+2.8%
4234
4234
0.0%
go/split/open_large
3.4 ms
3.4 ms
-0.5%
15310
15310
0.0%
go/split/open_large_full_file
3.1 ms
3.0 ms
-3.3%
14021
14023
0.0%
go/split/jump_to_end_large
1.5 ms
1.5 ms
-1.1%
4995
4995
0.0%
go/split/expand_gap
537 µs
526 µs
-2.1%
3255
3255
0.0%
go/unified/redraw
187 µs
188 µs
+0.1%
38
38
0.0%
go/unified/wheel_scroll
351 µs
341 µs
-2.8%
1528
1528
0.0%
go/unified/type_and_delete
394 µs
383 µs
-2.6%
123
123
0.0%
go/unified/page_down
1.0 ms
1.0 ms
+0.4%
3019
3019
0.0%
go/unified/open_large
2.4 ms
2.6 ms
+4.2%
12777
12776
0.0%
go/unified/open_large_full_file
2.9 ms
3.0 ms
+4.2%
12644
12646
0.0%
go/unified/jump_to_end_large
1.3 ms
1.3 ms
-1.1%
3275
3277
+0.1%
go/unified/expand_gap
464 µs
447 µs
-3.7%
1877
1877
0.0%
go/split_wrap/redraw
203 µs
196 µs
-3.5%
135
135
0.0%
go/split_wrap/wheel_scroll
431 µs
440 µs
+2.0%
2882
2883
0.0%
go/split_wrap/type_and_delete
629 µs
594 µs
-5.6%
309
310
+0.3%
go/split_wrap/resize
1.4 ms
1.2 ms
-13.0%
3879
3879
0.0%
go/unified_wrap/redraw
189 µs
178 µs
-6.0%
84
84
0.0%
go/unified_wrap/wheel_scroll
355 µs
331 µs
-6.8%
1574
1574
0.0%
go/unified_wrap/resize
787 µs
708 µs
-10.1%
1795
1795
0.0%
go/toggle_split_unified
266 µs
253 µs
-4.6%
1608
1608
0.0%
go/switch_diff_and_file_tab
246 µs
233 µs
-5.5%
1078
1078
0.0%
go/open_changes_large
4.0 ms
3.8 ms
-3.1%
14974
14975
0.0%
commit_detail/open_many_files
41.5 ms
38.9 ms
-6.2%
19254
19255
0.0%
commit_detail/wheel_scroll
604 µs
596 µs
-1.3%
3072
3072
0.0%
Benchmark
Base allocated bytes
PR allocated bytes
Change
go/split/redraw
2032 B
2032 B
0.0%
go/split/wheel_scroll
177472 B
177601 B
+0.1%
go/split/type_and_delete
19097 B
19097 B
0.0%
go/split/enter_and_backspace
162336 B
162345 B
0.0%
go/split/page_down
380329 B
380329 B
0.0%
go/split/open_large
2.3 MiB
2.3 MiB
0.0%
go/split/open_large_full_file
2.8 MiB
2.8 MiB
-0.2%
go/split/jump_to_end_large
384718 B
384756 B
0.0%
go/split/expand_gap
562382 B
562468 B
0.0%
go/unified/redraw
1888 B
1888 B
0.0%
go/unified/wheel_scroll
112267 B
112267 B
0.0%
go/unified/type_and_delete
18809 B
18819 B
+0.1%
go/unified/page_down
335680 B
335712 B
0.0%
go/unified/open_large
2.0 MiB
2.0 MiB
0.0%
go/unified/open_large_full_file
2.7 MiB
2.7 MiB
-0.2%
go/unified/jump_to_end_large
300593 B
300800 B
+0.1%
go/unified/expand_gap
411132 B
411140 B
0.0%
go/split_wrap/redraw
2768 B
2768 B
0.0%
go/split_wrap/wheel_scroll
178185 B
178195 B
0.0%
go/split_wrap/type_and_delete
263241 B
263276 B
0.0%
go/split_wrap/resize
2.1 MiB
2.1 MiB
0.0%
go/unified_wrap/redraw
2256 B
2256 B
0.0%
go/unified_wrap/wheel_scroll
112708 B
112638 B
-0.1%
go/unified_wrap/resize
1.4 MiB
1.4 MiB
0.0%
go/toggle_split_unified
75670 B
75670 B
0.0%
go/switch_diff_and_file_tab
48675 B
48675 B
0.0%
go/open_changes_large
2.7 MiB
2.7 MiB
-0.3%
commit_detail/open_many_files
4.2 MiB
4.2 MiB
-0.3%
commit_detail/wheel_scroll
331300 B
331172 B
0.0%
Log files
Geometric-mean change: time -1.1%, peak RSS +0.1%.
Click here to see benchmark details
Benchmark
Base
PR
Time change
Base peak RSS
PR peak RSS
Peak RSS change
1MiB
62.4 ms
62.1 ms
-0.5%
26.9 MiB
26.6 MiB
-1.1%
128MiB
140.4 ms
138.8 ms
-1.2%
171.0 MiB
170.9 MiB
-0.1%
256MiB
214.6 ms
206.1 ms
-4.0%
315.3 MiB
315.1 MiB
-0.1%
1MiB_wrap
69.2 ms
68.1 ms
-1.6%
27.3 MiB
27.0 MiB
-1.0%
128MiB_wrap
136.3 ms
135.0 ms
-0.9%
171.4 MiB
171.4 MiB
0.0%
256MiB_wrap
209.8 ms
210.3 ms
+0.2%
315.4 MiB
315.0 MiB
-0.1%
128MiB_edit
1843.5 ms
1851.8 ms
+0.5%
484.0 MiB
498.3 MiB
+3.0%
Code files
Geometric-mean change: time -6.7%, peak RSS +0.1%.
Click here to see benchmark details
Benchmark
Base
PR
Time change
Base peak RSS
PR peak RSS
Peak RSS change
64MiB
285.1 ms
235.0 ms
-17.6%
252.7 MiB
252.9 MiB
+0.1%
64MiB_type
1504.8 ms
1486.4 ms
-1.2%
252.7 MiB
252.8 MiB
0.0%
64MiB_enter
1134.7 ms
1132.7 ms
-0.2%
290.6 MiB
290.9 MiB
+0.1%
Timing changes are informational because shared CI runners are noisy; a benchmark error still fails the job.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @internal/app/editor_session_layout.go:
- Around line 47-48: Update the state.Ratio validation before assigning
node.Split.BottomRatio so valid ratios across the zero-to-one range, including
0.0375, are restored unchanged instead of reset to 0.5. Add a deterministic
restoration test that verifies a saved ratio of 0.0375 is preserved.
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Reviewing files that changed from the base of the PR and between adfa9e9 and 9419237.
Files selected for processing: 9
docs-web/src/content/docs/guides/editor.md
docs-web/src/content/docs/reference/settings.md
internal/app/editor_session.go
internal/app/editor_session_layout.go
internal/app/editor_session_layout_test.go
internal/config/editor_session.go
internal/config/editor_session_layout.go
internal/config/editor_session_layout_test.go
internal/ui/editor_layout.go
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With Restore workspace tabs enabled, reopening a split workspace currently puts all files into one editor group. Restore the split tree, divider proportions, focused group, and each group's tabs, pins, cursors, and scroll positions instead. Two restored views of the same file share one document while keeping their own view state.
Follow-up to the accepted split editor request #706 and the opt-in session feature #1488. This is the final extraction from the combined prototype #1481.
The existing
editor.restoreTabssetting stays off by default. Legacy flat tab sessions remain readable; explicit file arguments take precedence. Empty groups reopen with fresh untitled buffers. Unsaved content, undo history, terminals, and plugin tabs are not persisted. The existing per-workspace key and cleanup limits remain: 32 sessions, 128 file views, 30 days, and 1 MiB per session.Validation:
make test,make lint(0 issues), andmake buildpass. App tests cover nested right/down splits, divider ratios, focus in first/last groups, shared documents with independent views and pins, empty groups, missing files, opt-out, and explicit arguments. Config tests cover legacy sessions, view limits, and malformed trees. A two-process real-binary restart check verifies three groups and identical geometry, focus, paths, and cursor positions after reopening.Before and after below show the same three-file workspace immediately after restarting at 140×32, captured with
--exec screenshot.Before: restored into one group