Terminal: Missing devicePixelRatio listener causes misalignment on zoom

[ammaarrahmed]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.115.0
• OS Version: Ubuntu 24.04.4 LTS

Steps to Reproduce:

1. Open VS Code and open the integrated terminal in the panel.
2. Change the editor's zoom level using the keyboard shortcuts (Ctrl + + or Ctrl + -).
3. Observe the bug: The terminal canvas fails to repaint and align correctly with the new zoom dimensions. Depending on the zoom direction, the prompt text gets severely clipped at the top, disappears entirely out of the viewport bounds, or renders with excessive blank space above it. The inline suggestion ghost text also detaches and floats in the wrong position.
4. Switch to a different panel tab (e.g., "PORTS" or "OUTPUT") and switch back to "TERMINAL".
5. Observe the workaround: Forcing this tab switch triggers a re-render, causing the terminal canvas to properly recalculate its dimensions and fix the alignment.

Testing on main build

I also tested existence of this issue on my fork by building on main , issue still persists.

Media:

Screencast.from.2026-04-11.09-51-59.webm

PR Ready

Note to maintainers: I have already investigated the root cause of this issue (the terminal instance is missing a listener for window.devicePixelRatio / zoom level changes, causing it to use stale dimensions for the canvas renderer until a manual layout refresh is triggered). I have a Pull Request ready to go that implements this fix and will link it to this issue immediately after opening. I would love to contribute to vscode given the opportunity!

[ammaarrahmed]

Hey @pwang347 I have submitted a PR which resolves this issue through adding :

Two event listeners in the TerminalInstance constructor:

• PixelRatio.onDidChange — fires when devicePixelRatio changes (e.g. browser zoom, display scale)
• onDidChangeZoomLevel — fires from Electron's zoom API (e.g. Ctrl++/Ctrl+-)