[AGachet]

Resolves #1241

Summary

⌘N, now labelled "New panel" / "Nouveau panneau" (FR-SHELL-086, changed for #1241; TC-SHELL-169):

• At the pointer. A new panel opens beside the panel under the mouse pointer, on the side nearest it (left half: left, right half: right). Over no panel (sidebar, outside the window): right of the focused panel. One passive pointermove listener stores the coordinates; the panel is found with elementFromPoint only when ⌘N is pressed.
• Equal widths. In the normal layout the new panel joins the row of the pointed panel and that row's columns get the same width (rowEqualizeOps, the equalize action's column-span weights). Stacked columns keep their heights; other rows are not touched.
• What it opens. It uses the "When a new view opens" setting (New view chooser: favourite types left/right (Terminal, Web page…), the full list up/down, a setting to open one directly, and direct shortcuts #1232). The default opens the chooser with its favourites. A type can be set to open directly; Terminal opens the same terminal as before ⌘N changed (it inherits the folder and connection).
• 360 view. Over a carpet panel, the new panel goes beside it on the carpet. Over the fixed zone, it goes at the start of the carpet. Carpet widths do not change.
• The launcher's Terminal entry no longer shows ⌘N, because ⌘N no longer always opens a terminal.

Code: frontend/moltenterm-shell/newpanel/ (rules, pointer tracker, action), rowEqualizeOps in equalize/equalize-rules.ts, a MOLTENTERM-PATCH (#1241) in keymodel.ts with its row in UPSTREAM.md.

Behaviour change

To check first: ⌘N with the pointer over the right half of the left panel opens the chooser between the two panels, and all three columns get the same width. To get the old terminal back, set Settings › General › "When a new view opens" to Terminal.

• With ⌘N already in a tab of 3+ columns, the screen's column threshold (360 view per screen: switch beyond N columns, keep the developer's proportions #1083) may switch the tab to 360 view. In 360 view the new panel lands on the carpet at the place described above, and widths are not equalized there.
• Over a web page panel, the page swallows pointer moves. The panel is still found, but the side comes from where the pointer entered the page.

Tests

• Unit tests (newpanel/new-panel-model.test.ts):
  • pointer in the left half, in the right half, and outside (focused panel used);
  • in the row: 2 columns become 3 at 1/3 each, a stacked column keeps its inner heights, and only the joined row changes;
  • 360 view: beside a carpet column, and at the carpet's start from the fixed zone;
  • the setting: chooser by default, Terminal directly, another type directly, Sessions runs.
• Broke the side rule once, then the row scope once: each made its test fail.
• The registry's duplicate-shortcut test still passes.
• Ran task check:ts, npx vitest run (4163 passed), ESLint, Prettier and the ledger check.

---

Reviewed by AGachet · 2026-10-28

🤖 Generated with Claude Code

[github-actions]

MoltenTerm performance report

Commit 0bec6d04 · profile ci · 2026-10-28T16:07:09.523Z · 55 s · linux/x64, AMD EPYC 9V45 96-Core Processor (4 cores), 16 GB · load average 5.49 3.24 1.28 · Electron 42.11.18 · memory: pss

Gate (ci scope): PASS · baseline 0215ba07 · 15 metrics measured

NFR-PERF-003

Metric	Value	Budget	Baseline	Δ	Spread	Gate	Status
JS loaded up front by index.html (entry + modulepreloads)	9.24 MB	8 MB	9.83 MB	-0.59 (-6 %)	—	ci	over budget (as baseline)
JS evaluated by the starter tab view	9.76 MB	8 MB	30.78 MB	-21.02 (-68.3 %)	—	ci	over budget (as baseline)
Launches that did not reach wave-ready	0	0	0	0 (0 %)	—	ci	ok
Launch to first tab ready, warm (median)	941 ms	1500 ms	2128.5 ms	-1187.5 (-55.8 %)	—	local	ok
Tab view init, warm (median)	293.5 ms	600 ms	1342 ms	-1048.5 (-78.1 %)	—	local	ok
Launch to first tab ready, fresh data (median)	6766 ms	—	2299 ms	+4467 (+194.3 %)	—	info	regressed
Tab view init, fresh data (median)	1294 ms	—	1531 ms	-237 (-15.5 %)	—	info	ok

NFR-PERF-004

Metric	Value	Budget	Baseline	Δ	Spread	Gate	Status
Create workspace to new tab on screen (p95)	137 ms	150 ms	176.6 ms	-39.6 (-22.4 %)	2.2 %	local	ok
Delete a workspace (p95)	49 ms	150 ms	70.8 ms	-21.8 (-30.8 %)	1 %	local	ok
Workspace operations that never reached the screen (30 s)	0	0	0	0 (0 %)	—	local	ok

NFR-PERF-006

Metric	Value	Budget	Baseline	Δ	Spread	Gate	Status
Tab views left after deleting 4 workspaces	0	0	4	-4 (-100 %)	—	ci	ok
Tab views left after 5 create/delete loops	0	0	5	-5 (-100 %)	—	local	ok

NFR-PERF-007

Metric	Value	Budget	Baseline	Δ	Spread	Gate	Status
Renderer bundle JavaScript, raw	54.32 MB	—	53.99 MB	+0.33 (+0.6 %)	—	ci	ok
Renderer bundle JavaScript, gzip	10.33 MB	—	10.25 MB	+0.08 (+0.8 %)	—	info	ok
Renderer bundle CSS, raw	0.76 MB	—	0.71 MB	+0.05 (+7 %)	—	info	ok

Details

Start-up runs (ms from launch)

Run	wavesrv ready	Init Bare	wave-ready	1st tab view init	JS evaluated
cold	5049	6624	6766	1294	9.76 MB
warm	221	801	941	289	9.76 MB
warm	207	790	941	298	9.76 MB

Workspace operations (ms)

Operation	Samples
create	104, 113, 137, 137, 99, 97, 93, 94, 93
switchNew	—
switchVisited	—
delete	34, 31, 36, 35, 24, 49, 24, 23, 49

Leaks

{
 "afterDeletes": {
  "deleted": 4,
  "tabViews": 2,
  "spares": 1,
  "unresponsive": 0,
  "leaked": 0,
  "webviews": 1
 },
 "gatedLoops": {
  "loops": 5,
  "tabViews": 2,
  "spares": 1,
  "unresponsive": 0,
  "leaked": 0,
  "webviews": 1
 },
 "loops": {
  "loops": 5,
  "tabViews": 2,
  "spares": 1,
  "unresponsive": 0,
  "leaked": 0,
  "webviews": 1,
  "memBeforeMB": 788,
  "memAfterMB": 787.6
 }
}

Bundle

Up front: assets/index-BfdbqiQW.js 9.24 MB.
Largest: assets/ts.worker-C7hW3aY-.js 13.26 MB, assets/index-BfdbqiQW.js 9.24 MB, assets/monaco-react-BdsaBc1y.js 7.35 MB, assets/css.worker-umuuUiIb.js 1.87 MB, assets/yamlworker-VevFtHSr.js 1.44 MB, assets/cynefin-OW5HDTMX-DN-hgDnz.js 1.3 MB, assets/html.worker-BT47iy49.js 1.24 MB, assets/mermaid.core-DlF_3gez.js 1.06 MB, assets/cytoscape.esm-DlPuZvnJ.js 0.96 MB, assets/json.worker-D4JVmXIe.js 0.84 MB.