entering and exiting altscreen in the terminal causes mouse wheel scrolling to misbehave

[zygoloid]

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

• VS Code Version: 1.95.3
• OS Version: Mac OS Sonoma 14.7.1

Steps to Reproduce:

1. Open Terminal
2. Create enough output that the terminal scrolls
3. Run any command that switches the terminal to altscreen and back. For example, run and quit less /usr/share/dict/words or run and quit vim.
4. Attempt to scroll the terminal using the mouse wheel.

Expected behavior:

The terminal scrolls relative to the current position (the bottom of the scrollback).

Actual behavior:

Attempting to scroll up has no effect. Attempting to scroll down jumps to the top of the scrollback and scrolls down from there.

Based on the behavior, I'd imagine that switching to altscreen is resetting some notion of the internal scroll position to the top of the scrollback, and it's not being properly restored when the altscreen is ended.