Perf/terminal throughput

.github/workflows/ci.yml

@@ -74,6 +74,8 @@ jobs:
           cargo test local_only
           cargo test commands::private_key_inspection_tests
           cargo test ssh::tests -- --test-threads=1
+          cargo test pty_output_flush
+          cargo test pty::tests
 
       - name: Run ignored SSH security tests on Linux
         if: matrix.platform == 'ubuntu-22.04'

CHANGELOG.md

@@ -4,7 +4,15 @@ All notable changes to Zync are documented in this file. The format is based on
 
 ## [Unreleased]
 
+## [2.30.0] - 2026-09-08
+
+### Changed
+- **Terminal output flush:** First PTY bytes after quiet go to the terminal immediately (typing echo no longer waits up to 8 ms). Busy output merges for a 12 ms burst, or sooner at 128 KiB. The live Channel frame is still generation + raw bytes. Debug: `localStorage.zyncTerminalIoDebug = '1'`. ([2424743], [d6ca46b])
+- **Terminal sniffers:** Secret/cwd helpers scan at most the last 4 KiB of large PTY frames so `cat` does not regex the whole dump. The terminal still receives every byte. ([2424743], [1ed79d8])
+- **File list and grid windowing:** File Manager list and icon grid only paint visible cells. Sort lives on FileManager so keyboard order matches the painted order. Grid arrows use the live column count instead of scanning the DOM. Folder loads no longer grayscale/scale the listing; recycled cells skip Radix tooltips and icon fade-in so scroll and clicks stay immediate. Icon-grid tiles use a fixed row height so the first row stays on screen and selected folders are normal-sized cards. ([c266a76], [5750e36], [ccb38e4], [7fa63ae], [ae6b9fa], [ecdaefc], [e5c2254])
+
 ### Added
+- **What's New media**: Release notes show images, GIFs, and short videos inline (GitHub attachments, HTTPS `.gif`/`.png`/`.mp4` CDNs, and local files). A bare Demo URL is embedded instead of left as a link. Click an image to enlarge. GitHub alerts, `<kbd>`, and task lists render; HTML stays sanitized. ([84080c5], [d6ca46b])
 - **Smooth splits**: New panes grow in (about 280ms) instead of jumping to 50/50 — keyboard split, split icons, drag-to-dock, and Open in split / Open here. A quiet accent veil marks the incoming pane. Drag-to-split preview eases between edges. Divider drag stays immediate (no laggy flex transition). `prefers-reduced-motion` skips the intro. PTY resize waits until the intro ends, same as a divider drag. ([2d3b7c8])
 - **Scroll to resize a split**: Hover the seam and use the mouse wheel or trackpad to move it. Drag and arrow keys still work. PTY resize waits until scrolling settles, same as a divider drag. Ctrl/Cmd+wheel is left for zoom. ([2d3b7c8])
 - **Files in split**: Open Files beside a shell in the same tab (folder button next to the split icons, or workspace **+ → Files in split**). Split icons and Ctrl+Shift+arrows still create a shell. Workspace **+ → Files** stays the full-view overlay. Closing the Files pane unsplits that leaf; the tab × still closes the whole group. Files counts toward the 4-pane cap and never replaces the last shell. ([2d3b7c8])
@@ -13,7 +21,9 @@ All notable changes to Zync are documented in this file. The format is based on
 - **Open here in split**: Terminal **Open File Manager Here** is one row with **In a new tab** / **Left** / **Right** / **Bottom**. Files **Open Terminal Here** and **Follow with Terminal** use the same submenu. Split docks beside the current pane (not a stray new tab). ([2d3b7c8])
 
 ### Fixed
-- **Files opening at `/`**: File Manager no longer treats `/` as home. Open File Manager Here uses the shell cwd (or a real `fs_cwd`), not the pre-connect placeholder. First open and reconnect do the same. On Windows, local home uses `%USERPROFILE%` instead of unset `HOME`. ([2d3b7c8])
+- **Files opening at `/`**: File Manager no longer treats `/` as home. Open File Manager Here uses the shell cwd (or a real `fs_cwd`), not the pre-connect placeholder. First open ignores a shell cwd of `/` or `~` (SFTP cannot list a tilde) and expands to a real home instead of walking up to `/`. Reconnect keeps `/` when that listing already has files (hash button). Switching hosts clears selection and the open editor. On Windows, local home uses `%USERPROFILE%` instead of unset `HOME`. ([e5c2254], [e7334e6])
+- **Icon grid right gap:** Grid columns fill the Files pane (no empty strip, no leftover 3-column layout in a wide window). Large folders re-render less while the shell cwd updates. ([40f3988])
+
 - **Drag shell tab onto itself**: Dropping the current shell tab on its own split is a no-op again and restores Files / Dashboard / Snippets if the drag started from that overlay. ([2d3b7c8])
 - **Open here after a tab switch**: Open File Manager Here / Open Terminal Here keep the tab that opened the menu, instead of applying to whichever tab is active after the await. ([2d3b7c8])
 - **Files overlay vs Files pane**: The keep-alive overlay FileManager no longer steals focus or drives Follow-terminal while a Files pane is showing (and the reverse). ([2d3b7c8])
@@ -1369,7 +1379,22 @@ Partial draft: desktop builds, AppImage Wayland strip, and APT `2.25.4` publishe
 [d3f4060]: https://github.com/zync-sh/zync/commit/d3f4060
 [840afc2]: https://github.com/zync-sh/zync/commit/840afc2
 [193f568]: https://github.com/zync-sh/zync/commit/193f568
-[Unreleased]: https://github.com/zync-sh/zync/compare/v2.29.0...HEAD
+[Unreleased]: https://github.com/zync-sh/zync/compare/v2.30.0...HEAD
+[2.30.0]: https://github.com/zync-sh/zync/compare/v2.29.0...v2.30.0
+[2424743]: https://github.com/zync-sh/zync/commit/2424743
+[1ed79d8]: https://github.com/zync-sh/zync/commit/1ed79d8
+[c266a76]: https://github.com/zync-sh/zync/commit/c266a76
+[5750e36]: https://github.com/zync-sh/zync/commit/5750e36
+[ccb38e4]: https://github.com/zync-sh/zync/commit/ccb38e4
+[7fa63ae]: https://github.com/zync-sh/zync/commit/7fa63ae
+[ae6b9fa]: https://github.com/zync-sh/zync/commit/ae6b9fa
+[ecdaefc]: https://github.com/zync-sh/zync/commit/ecdaefc
+[e5c2254]: https://github.com/zync-sh/zync/commit/e5c2254
+[40f3988]: https://github.com/zync-sh/zync/commit/40f3988
+[e7334e6]: https://github.com/zync-sh/zync/commit/e7334e6
+[84080c5]: https://github.com/zync-sh/zync/commit/84080c5
+[d6ca46b]: https://github.com/zync-sh/zync/commit/d6ca46b
+[2d3b7c8]: https://github.com/zync-sh/zync/commit/2d3b7c8
 [2.29.0]: https://github.com/zync-sh/zync/compare/v2.28.0...v2.29.0
 [2.28.0]: https://github.com/zync-sh/zync/compare/v2.27.1...v2.28.0
 [5181d5e]: https://github.com/zync-sh/zync/commit/5181d5e

CONTRIBUTING.md

@@ -42,6 +42,7 @@ Thank you for your interest in contributing to Zync. This document provides guid
    npm run type-check
    npm run tauri build
    ```
+   Release Rust uses thin LTO (`src-tauri/Cargo.toml` `[profile.release]`). `tauri dev` is unchanged.
 
 4. Commit with clear, descriptive messages:
    ```bash

docs/TERMINAL.md

@@ -211,11 +211,12 @@ Public surface exported from `index.ts`. Key modules:
 
 | File | Responsibility |
 |------|------|
-| `src-tauri/src/pty.rs` | PtyManager: local spawn/read/write/resize/close; remote SSH reader; output batching (8ms / 4KB); explicit `child.kill()` on close |
-| `src-tauri/src/commands.rs` | `terminal_create` (accepts output `Channel`), `terminal_write`, `terminal_resize`, `terminal_has_active_processes`, close variants |
+| `src-tauri/src/pty.rs` | PtyManager: local spawn/read/write/resize/close; remote SSH reader; output flush via `pty_output_flush`; explicit `child.kill()` on close |
+| `src-tauri/src/pty_output_flush.rs` | Idle-immediate + fixed 12 ms burst epoch + 128 KiB flush **threshold** (not max frame size). Process-wide flush-reason counters. |
+| `src-tauri/src/commands.rs` | `terminal_create` (accepts output `Channel`), `terminal_write`, `terminal_resize`, `terminal_has_active_processes`, `terminal_flush_stats` (process-wide flush-reason snapshot; not on the output Channel), close variants |
 | `src-tauri/src/ghost/*` | Ghost suggestion persistence, parser, ranking, Tauri commands |
 
-**Output batching (remote & local):** `REMOTE_OUTPUT_BATCH_MS` / `OUTPUT_FLUSH_THRESHOLD` coalesce before sending to frontend channel.
+**Output flush (remote & local):** `OUTPUT_BURST_EPOCH_MS` (12 ms **fixed epoch**, not a debounce) and `OUTPUT_BURST_FLUSH_THRESHOLD` (128 KiB — flush at least this soon while bursting, not a max frame size). First bytes after idle send immediately; later packets in the epoch accumulate; close/EOF/`output_rx` None always drain the tail. Frame layout is unchanged: `u32` LE generation + raw bytes.
 
 **Resize (remote):** SSH resize channel drains to latest cols/rows (trailing coalesce).
 
@@ -230,6 +231,7 @@ Public surface exported from `index.ts`. Key modules:
 - `terminal:resize` — cols/rows from unified resize scheduler
 - `terminal:close` / `terminal:close_by_connection` — programmatic teardown (**no** `terminal-exit`)
 - `terminal_has_active_processes` — local sysinfo child-tree probe
+- `terminal:flush-stats` / `terminal_flush_stats` — process-wide flush-reason counters (`idleFirst` / `timer` / `threshold` / `close`). Debug only. Not on the PTY output Channel.
 
 ### Events (listen)
 
@@ -310,7 +312,9 @@ xterm.onData
 [ u32 generation (LE) ][ raw PTY bytes... ]
 ```
 
-Decoded in `terminalOutputStream.ts` → `term.write()` after generation check.
+Decoded in `terminalOutputStream.ts` → generation check → sniffers → `term.write()` of the **full** frame.
+
+Sniffers (secret prompt / prompt cwd) are reading aids. Frames ≤ 8 KiB are scanned in full. Larger frames scan only the last 4 KiB (`selectSnifferBytes`). A prompt is detected iff it appears in a ≤8 KiB frame or in that tail. `term.write` is never sliced (byte-exact xterm). OSC 7 cwd is parsed inside xterm, not these sniffers.
 
 **Legacy:** `terminal-output-*` events removed. `terminalOutputPayload.ts` retains base64/array decode for older dev builds.
 
@@ -536,6 +540,7 @@ src/index.css              # .terminal-container, xterm 6 viewport overrides
 
 ```
 src-tauri/src/pty.rs
+src-tauri/src/pty_output_flush.rs
 src-tauri/src/commands.rs
 src-tauri/src/ghost/
 ```