# cmux 0.64.17: Global Font Magnification, Remote tmux Mirroring, Diff Viewer Branch Picker

[ Changelog](https://cmux.com/docs/changelog)


June 23, 2026

### Global Font Magnification

Scale the entire cmux interface up or down with a single magnification control, not just the terminal font.

### Remote tmux Mirroring (Beta)

Mirror a remote tmux session over SSH using -CC control mode, so remote windows show up as native cmux tabs that stay in sync with renames and reorders.

### Browser and Diff Viewer Polish

Browser panes get a Chrome-style audio-playing indicator and a hard-refresh shortcut. The diff viewer adds a searchable, uncapped branch-base picker with smart defaults and a toolbar that never overlaps at small widths.

### Stability and Performance

Fixes for a sidebar lag regression, a vertical-sidebar tab-switch crash, a ~100% CPU re-render loop on bundled extension sidebars, blank SF Symbol controls on macOS 27, terminal content duplication on resize, and quit hangs from analytics flushing.

Added

-   Remote tmux mirroring over SSH using `-CC` control mode, in beta ([#5553](https://github.com/manaflow-ai/cmux/pull/5553)) -- thanks @robertnisipeanu!
-   Global font magnification to scale the whole interface ([#6554](https://github.com/manaflow-ai/cmux/pull/6554))
-   Right-sidebar custom sidebar tabs ([#6430](https://github.com/manaflow-ai/cmux/pull/6430))
-   Chrome-style audio-playing indicator on browser panes ([#6517](https://github.com/manaflow-ai/cmux/pull/6517))
-   Browser hard-refresh shortcut ([#6256](https://github.com/manaflow-ai/cmux/pull/6256))
-   Clear Screen (Keep Scrollback) command, bound to Cmd+Shift+K ([#6139](https://github.com/manaflow-ai/cmux/pull/6139))
-   Configurable terminal scroll-speed multiplier via `terminal.scrollSpeed` ([#5671](https://github.com/manaflow-ai/cmux/pull/5671)) -- thanks @RubiconPerform!
-   Open the selected file from the keyboard in the file explorer ([#6001](https://github.com/manaflow-ai/cmux/pull/6001))
-   One-step grouped workspace creation ([#6657](https://github.com/manaflow-ai/cmux/pull/6657))
-   Searchable, uncapped diff viewer branch-base picker with smart defaults ([#6484](https://github.com/manaflow-ai/cmux/pull/6484)) -- thanks @azooz2003-bit!
-   Mark workspaces read/unread and clear notifications from the workspace group menu ([#6535](https://github.com/manaflow-ai/cmux/pull/6535)) -- thanks @azooz2003-bit!
-   Profiling capture action with a live progress window ([#6433](https://github.com/manaflow-ai/cmux/pull/6433), [#6440](https://github.com/manaflow-ai/cmux/pull/6440))
-   `cmux remotes` CLI to manage device-registry routes ([#6096](https://github.com/manaflow-ai/cmux/pull/6096))
-   Flag "Needs input" for blocked AskUserQuestion and ExitPlanMode prompts under `--dangerously-skip-permissions` ([#6608](https://github.com/manaflow-ai/cmux/pull/6608))
-   iOS (beta): on-device voice dictation in the composer ([#6197](https://github.com/manaflow-ai/cmux/pull/6197))
-   iOS (beta): image attachments in the composer ([#6102](https://github.com/manaflow-ai/cmux/pull/6102))
-   iOS (beta): Return key on the terminal accessory bar ([#6101](https://github.com/manaflow-ai/cmux/pull/6101))
-   iOS (beta): mark workspaces read/unread from the terminal menu, with an unread-count badge on the back button ([#6362](https://github.com/manaflow-ai/cmux/pull/6362), [#6350](https://github.com/manaflow-ai/cmux/pull/6350))

Changed

-   Terminal and browser surface tabs hug their content instead of stretching to a fixed width ([#6653](https://github.com/manaflow-ai/cmux/pull/6653))
-   Prioritize full command-palette title matches over partial ones ([#6498](https://github.com/manaflow-ai/cmux/pull/6498))
-   Reduce UI lag from Settings, sidebar, git, and browser churn ([#6260](https://github.com/manaflow-ai/cmux/pull/6260)) -- thanks @azooz2003-bit!
-   Evict hidden browser WebViews under memory pressure and defer restored WebViews until visible ([#6585](https://github.com/manaflow-ai/cmux/pull/6585), [#6508](https://github.com/manaflow-ai/cmux/pull/6508))
-   Gate idle pollers to the active workspace ([#6583](https://github.com/manaflow-ai/cmux/pull/6583))
-   Diff viewer toolbar stays responsive and never overlaps at small widths ([#6550](https://github.com/manaflow-ai/cmux/pull/6550)) -- thanks @azooz2003-bit!
-   Allow `.m4r` files as notification sounds ([#6635](https://github.com/manaflow-ai/cmux/pull/6635))
-   iOS (beta): collapse workspace folders per device ([#6666](https://github.com/manaflow-ai/cmux/pull/6666))

Fixed

-   Fix a sidebar lag regression from v0.64.16 by cutting per-row font-modifier and pin-state work ([#6613](https://github.com/manaflow-ai/cmux/pull/6613))
-   Fix the Codex sidebar status lifecycle and stale Claude notification sidebar status ([#6609](https://github.com/manaflow-ai/cmux/pull/6609), [#6473](https://github.com/manaflow-ai/cmux/pull/6473))
-   Fix sidebar tab selection highlight timing ([#6627](https://github.com/manaflow-ai/cmux/pull/6627))
-   Fix Cmd+T opening in home after an agent-resume session restore ([#6621](https://github.com/manaflow-ai/cmux/pull/6621))
-   Fix explicit surface routing for read-screen and send ([#6605](https://github.com/manaflow-ai/cmux/pull/6605))
-   Fix stale surface-to-panel rebinding and stale agent-resume executable paths ([#6581](https://github.com/manaflow-ai/cmux/pull/6581), [#6582](https://github.com/manaflow-ai/cmux/pull/6582))
-   Fix terminal input after a window key restore ([#6518](https://github.com/manaflow-ai/cmux/pull/6518))
-   Fix the Cmd+grave show/hide global hotkey ([#6477](https://github.com/manaflow-ai/cmux/pull/6477))
-   Fix vim copy-mode cursor, V/Y selection, and pasteboard ([#6221](https://github.com/manaflow-ai/cmux/pull/6221))
-   Fix copy-on-select parity with Ghostty ([#6200](https://github.com/manaflow-ai/cmux/pull/6200))
-   Fix the crash-diagnostic window restore ([#6596](https://github.com/manaflow-ai/cmux/pull/6596))
-   Fix a tab-switch crash in the vertical sidebar ([#6340](https://github.com/manaflow-ai/cmux/pull/6340))
-   Fix a ~100% CPU re-render loop when selecting a bundled extension sidebar ([#6341](https://github.com/manaflow-ai/cmux/pull/6341))
-   Fix blank SF Symbol controls on macOS 27 ([#6396](https://github.com/manaflow-ai/cmux/pull/6396))
-   Fix the audio indicator audibility signal ([#6566](https://github.com/manaflow-ai/cmux/pull/6566))
-   Fix browser download trigger parity ([#6258](https://github.com/manaflow-ai/cmux/pull/6258))
-   Recover Settings opened from offscreen frames, and stop a closed Settings window from reappearing ([#5806](https://github.com/manaflow-ai/cmux/pull/5806), [#6193](https://github.com/manaflow-ai/cmux/pull/6193))
-   Fix title-churn beachball in transcript adoption and sidebar rows ([#6460](https://github.com/manaflow-ai/cmux/pull/6460))
-   Restore the pane header title after a terminal restart ([#6333](https://github.com/manaflow-ai/cmux/pull/6333))
-   Recover a blank Markdown viewer pane after dragging it to another column ([#6331](https://github.com/manaflow-ai/cmux/pull/6331))
-   Vault sidebar always offers "Show more" so capped folder sections stay reachable ([#6327](https://github.com/manaflow-ai/cmux/pull/6327))
-   Fix the working directory after session-restore resume for Claude and other agents ([#6458](https://github.com/manaflow-ai/cmux/pull/6458), [#6205](https://github.com/manaflow-ai/cmux/pull/6205))
-   Fix Claude Code 2.1.183 agent-team teammates opening split panes again ([#6499](https://github.com/manaflow-ai/cmux/pull/6499))
-   Preserve Claude Teams restore flags ([#6242](https://github.com/manaflow-ai/cmux/pull/6242))
-   Fix right-sidebar surface shortcut spam routing ([#6472](https://github.com/manaflow-ai/cmux/pull/6472))
-   Fix Dia browser import profile detection ([#6478](https://github.com/manaflow-ai/cmux/pull/6478))
-   Fix zsh aliases after the agent return shell ([#6515](https://github.com/manaflow-ai/cmux/pull/6515))
-   Fix settings search for auto-naming and broaden fuzzy settings-search matching ([#6201](https://github.com/manaflow-ai/cmux/pull/6201), [#6196](https://github.com/manaflow-ai/cmux/pull/6196))
-   Fix terminal focus retry after a tiny responder handoff ([#6359](https://github.com/manaflow-ai/cmux/pull/6359))
-   Avoid DevTools teardown during redock ([#6559](https://github.com/manaflow-ai/cmux/pull/6559))
-   Fix hidden popover relayout and reduce hit-test CPU during SwiftUI updates and pointer movement ([#6589](https://github.com/manaflow-ai/cmux/pull/6589), [#6592](https://github.com/manaflow-ai/cmux/pull/6592))
-   Cache the settings search index per runtime ([#6591](https://github.com/manaflow-ai/cmux/pull/6591))
-   Move the open-diff baseline lookup off the main thread ([#6497](https://github.com/manaflow-ai/cmux/pull/6497))
-   Fix the macOS notification fallback identity ([#6000](https://github.com/manaflow-ai/cmux/pull/6000))
-   Fix a remote PTY restore probe reply leak ([#6070](https://github.com/manaflow-ai/cmux/pull/6070))
-   Fix OpenCode bunfs worker autoresume and OpenCode resume after a TUI-settings capture ([#6680](https://github.com/manaflow-ai/cmux/pull/6680), [#6397](https://github.com/manaflow-ai/cmux/pull/6397))
-   Fix notification jump-focus for nested tabs ([#6416](https://github.com/manaflow-ai/cmux/pull/6416))
-   Remove a sidebar rows measurement that re-livelocked layout at scale ([#6188](https://github.com/manaflow-ai/cmux/pull/6188))
-   Prevent quit hangs from analytics flushing ([#6232](https://github.com/manaflow-ai/cmux/pull/6232), [#6417](https://github.com/manaflow-ai/cmux/pull/6417)) -- thanks @azooz2003-bit!
-   Reduce Sentry CLI broken-pipe crashes and hangs ([#6254](https://github.com/manaflow-ai/cmux/pull/6254)) -- thanks @azooz2003-bit!
-   Release closed macOS helper windows ([#6368](https://github.com/manaflow-ai/cmux/pull/6368)) -- thanks @azooz2003-bit!
-   Fix canvas tab hover hit-testing, focus canvas panes from terminal body clicks, and fix canvas zoom-animation snap at low zoom ([#6555](https://github.com/manaflow-ai/cmux/pull/6555), [#6456](https://github.com/manaflow-ai/cmux/pull/6456), [#6538](https://github.com/manaflow-ai/cmux/pull/6538)) -- thanks @azooz2003-bit!
-   Avoid nested quit-confirmation modal loops ([#6461](https://github.com/manaflow-ai/cmux/pull/6461)) -- thanks @azooz2003-bit!
-   Reduce redundant panel title update work ([#6552](https://github.com/manaflow-ai/cmux/pull/6552)) -- thanks @Eridanus117!
-   Fix a QuickLook preview crash on a deactivated QLPreviewView ([#6402](https://github.com/manaflow-ai/cmux/pull/6402)) -- thanks @thiveeiyan!
-   Fix terminal content duplication on window resize ([#6386](https://github.com/manaflow-ai/cmux/pull/6386)) -- thanks @mvanhorn!
-   Stop the main window drifting down on sleep/wake ([#6305](https://github.com/manaflow-ai/cmux/pull/6305)) -- thanks @sergej-koscejev!
-   Fix stale cmux ssh pane resize by reconciling remote PTY size after arming SIGWINCH, and fix resize with SSH ControlMaster ([#5989](https://github.com/manaflow-ai/cmux/pull/5989), [#6432](https://github.com/manaflow-ai/cmux/pull/6432)) -- thanks @kylejcaron!
-   Sync remote tmux session renames to the mirror workspace title, and fix session discovery under a non-UTF-8 remote locale ([#6602](https://github.com/manaflow-ai/cmux/pull/6602), [#6568](https://github.com/manaflow-ai/cmux/pull/6568)) -- thanks @mxschmitt!
-   Fix the cmux ssh-tmux socket path being too long for AF\_UNIX ([#6465](https://github.com/manaflow-ai/cmux/pull/6465)) -- thanks @mxschmitt!
-   Fix remote-tmux mirror buffer truncation on a cross-DPI display move, and restore the bonsplit pointer so ssh-tmux tab reorders sync to tmux ([#6393](https://github.com/manaflow-ai/cmux/pull/6393), [#6438](https://github.com/manaflow-ai/cmux/pull/6438)) -- thanks @robertnisipeanu!
-   Merge user `--settings` into injected hook settings in the claude wrapper ([#5388](https://github.com/manaflow-ai/cmux/pull/5388)) -- thanks @choi88andys!
-   Bound iOS pairing attempts and fix the Pair iPhone window (Cmd+W, sizing, layout, QR padding, failure copy) ([#6495](https://github.com/manaflow-ai/cmux/pull/6495), [#6038](https://github.com/manaflow-ai/cmux/pull/6038))
-   iOS (beta): fix native pairing sign-in failures ([#6457](https://github.com/manaflow-ai/cmux/pull/6457)) -- thanks @azooz2003-bit!
-   iOS (beta): fix the unread count badge contrast, stop pausing background music on text submit, and sustain hold-to-repeat Backspace ([#6524](https://github.com/manaflow-ai/cmux/pull/6524), [#6290](https://github.com/manaflow-ai/cmux/pull/6290), [#6299](https://github.com/manaflow-ai/cmux/pull/6299))
-   Fix the changelog title clipping ([#6425](https://github.com/manaflow-ai/cmux/pull/6425))

Removed

-   Remove the high-memory pane warning UI (the triangle indicator and popover); the underlying guardrail engine stays ([#6619](https://github.com/manaflow-ai/cmux/pull/6619))

Contributors

[![austinywang](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Faustinywang.png%3Fsize%3D48&w=48&q=75)austinywang](https://github.com/austinywang) [![azooz2003-bit](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fazooz2003-bit.png%3Fsize%3D48&w=48&q=75)azooz2003-bit](https://github.com/azooz2003-bit) [![choi88andys](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fchoi88andys.png%3Fsize%3D48&w=48&q=75)choi88andys](https://github.com/choi88andys) [![Eridanus117](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2FEridanus117.png%3Fsize%3D48&w=48&q=75)Eridanus117](https://github.com/Eridanus117) [![kylejcaron](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fkylejcaron.png%3Fsize%3D48&w=48&q=75)kylejcaron](https://github.com/kylejcaron) [![lawrencecchen](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Flawrencecchen.png%3Fsize%3D48&w=48&q=75)lawrencecchen](https://github.com/lawrencecchen) [![mvanhorn](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fmvanhorn.png%3Fsize%3D48&w=48&q=75)mvanhorn](https://github.com/mvanhorn) [![mxschmitt](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fmxschmitt.png%3Fsize%3D48&w=48&q=75)mxschmitt](https://github.com/mxschmitt) [![robertnisipeanu](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Frobertnisipeanu.png%3Fsize%3D48&w=48&q=75)robertnisipeanu](https://github.com/robertnisipeanu) [![RubiconPerform](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2FRubiconPerform.png%3Fsize%3D48&w=48&q=75)RubiconPerform](https://github.com/RubiconPerform) [![sergej-koscejev](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fsergej-koscejev.png%3Fsize%3D48&w=48&q=75)sergej-koscejev](https://github.com/sergej-koscejev) [![thiveeiyan](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Fthiveeiyan.png%3Fsize%3D48&w=48&q=75)thiveeiyan](https://github.com/thiveeiyan)

[ cmux 0.64.16](https://cmux.com/docs/changelog/0.64.16) [cmux 0.64.18 ](https://cmux.com/docs/changelog/0.64.18)

Canonical: https://cmux.com/docs/changelog/0.64.17

Documentation index: https://cmux.com/llms.txt