Zoom in (increase font size) not working — zoom out works fine

[DaikiHayata]

Bug

Zoom in (increase font size) does not work at all. Zoom out (decrease font size) works correctly.

Steps to reproduce

1. Open cmux (v0.62.2)
2. Focus a terminal pane
3. Try to zoom in via either:
   • Menu: View → Zoom In
   • Keyboard shortcut: ⌘;
4. Try to zoom out via either:
   • Menu: View → Zoom Out
   • Keyboard shortcut: ⌘-

Expected behavior

Both zoom in and zoom out change the font size accordingly.

Actual behavior

• Zoom out (⌘-): Works correctly — font size decreases
• Zoom in (⌘;): Menu item flashes (acknowledges the input) but font size does NOT increase

This happens both via the menu and the keyboard shortcut, so it's not a keybinding issue — the zoom in action itself is broken.

Environment

• cmux v0.62.2
• macOS (Darwin 25.2.0)

Related issues

This appears to be a regression from previously fixed issues:

• Cmd + / Cmd - zoom shortcuts are broken #310 — Cmd + / Cmd - zoom shortcuts are broken (CLOSED)
• 'cmd' + '+' to zoom #343 — 'cmd' + '+' to zoom (CLOSED)
• Terminal zoom (Cmd+/Cmd-) not working — need Ghostty feature parity #383 — Terminal zoom (Cmd+/Cmd-) not working — need Ghostty feature parity (CLOSED)

Zoom out was fixed, but zoom in remains broken.

Possibly related upstream

• ghostty-org/ghostty#8820 — Decrease font size shortcut doing the opposite

[aqilc]

Did you guys find any way to zoom back in? The menu bar doesn't work either and I'm at my wit's end.