Add hideOnLastClosed setting

Fixes microsoft#236517

Author: Tyriar

src/vs/platform/terminal/common/terminal.ts

@@ -103,6 +103,7 @@ export const enum TerminalSettingId {
 	EnablePersistentSessions = 'terminal.integrated.enablePersistentSessions',
 	PersistentSessionReviveProcess = 'terminal.integrated.persistentSessionReviveProcess',
 	HideOnStartup = 'terminal.integrated.hideOnStartup',
+	HideOnLastClosed = 'terminal.integrated.hideOnLastClosed',
 	CustomGlyphs = 'terminal.integrated.customGlyphs',
 	RescaleOverlappingGlyphs = 'terminal.integrated.rescaleOverlappingGlyphs',
 	PersistentSessionScrollback = 'terminal.integrated.persistentSessionScrollback',

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

@@ -208,7 +208,7 @@ export class TerminalService extends Disposable implements ITerminalService {
 		// down. When shutting down the panel is locked in place so that it is restored upon next
 		// launch.
 		this._register(this._terminalGroupService.onDidChangeActiveInstance(instance => {
-			if (!instance && !this._isShuttingDown) {
+			if (!instance && !this._isShuttingDown && this._terminalConfigService.config.hideOnLastClosed) {
 				this._terminalGroupService.hidePanel();
 			}
 			if (instance?.shellType) {

src/vs/workbench/contrib/terminal/common/terminal.ts

@@ -211,6 +211,7 @@ export interface ITerminalConfiguration {
 	experimental?: {
 		windowsUseConptyDll?: boolean;
 	};
+	hideOnLastClosed: boolean;
 }
 
 export interface ITerminalFont {

src/vs/workbench/contrib/terminal/common/terminalConfiguration.ts

@@ -549,6 +549,11 @@ const terminalConfiguration: IConfigurationNode = {
 			],
 			default: 'never'
 		},
+		[TerminalSettingId.HideOnLastClosed]: {
+			description: localize('terminal.integrated.hideOnLastClosed', "Whether to hide the terminal view when the last terminal is closed. This will only happen when the terminal is the only visible view in the view container."),
+			type: 'boolean',
+			default: true
+		},
 		[TerminalSettingId.CustomGlyphs]: {
 			markdownDescription: localize('terminal.integrated.customGlyphs', "Whether to draw custom glyphs for block element and box drawing characters instead of using the font, which typically yields better rendering with continuous lines. Note that this doesn't work when {0} is disabled.", `\`#${TerminalSettingId.GpuAcceleration}#\``),
 			type: 'boolean',