Disable scroll terminal buffer when alt buffer is active

They wouldn't do anything.

Fixes #90838

src/vs/workbench/contrib/terminal/browser/terminalActions.ts

@@ -543,7 +543,7 @@ export function registerTerminalActions() {
 				keybinding: {
 					primary: KeyMod.CtrlCmd | KeyMod.Alt | KeyCode.PageDown,
 					linux: { primary: KeyMod.CtrlCmd | KeyMod.Shift | KeyCode.DownArrow },
-					when: TerminalContextKeys.focus,
+					when: ContextKeyExpr.and(TerminalContextKeys.focus, TerminalContextKeys.altBufferActive.negate()),
 					weight: KeybindingWeight.WorkbenchContrib
 				},
 				precondition: TerminalContextKeys.processSupported
@@ -583,7 +583,7 @@ export function registerTerminalActions() {
 				keybinding: {
 					primary: KeyMod.CtrlCmd | KeyCode.End,
 					linux: { primary: KeyMod.Shift | KeyCode.End },
-					when: TerminalContextKeys.focus,
+					when: ContextKeyExpr.and(TerminalContextKeys.focus, TerminalContextKeys.altBufferActive.negate()),
 					weight: KeybindingWeight.WorkbenchContrib
 				},
 				precondition: TerminalContextKeys.processSupported
@@ -603,7 +603,7 @@ export function registerTerminalActions() {
 				keybinding: {
 					primary: KeyMod.CtrlCmd | KeyMod.Alt | KeyCode.PageUp,
 					linux: { primary: KeyMod.CtrlCmd | KeyMod.Shift | KeyCode.UpArrow },
-					when: TerminalContextKeys.focus,
+					when: ContextKeyExpr.and(TerminalContextKeys.focus, TerminalContextKeys.altBufferActive.negate()),
 					weight: KeybindingWeight.WorkbenchContrib
 				},
 				precondition: TerminalContextKeys.processSupported
@@ -643,7 +643,7 @@ export function registerTerminalActions() {
 				keybinding: {
 					primary: KeyMod.CtrlCmd | KeyCode.Home,
 					linux: { primary: KeyMod.Shift | KeyCode.Home },
-					when: TerminalContextKeys.focus,
+					when: ContextKeyExpr.and(TerminalContextKeys.focus, TerminalContextKeys.altBufferActive.negate()),
 					weight: KeybindingWeight.WorkbenchContrib
 				},
 				precondition: TerminalContextKeys.processSupported