Use new isTransient API to prevent duplicate integrated consoles (#3854)

This new API available today in VS Code 1.65.0 prevents Code from saving
and reloading the integrated console when the extension is reloaded.
This is necessary because the extension always spawns a new terminal to
host PowerShell Editor Services when it starts, and Code's newish
feature to save and restore terminals caused these to be duplicated.
When we update the VS Code engine, we can remove the cast to `any`.

Author: andyleejordan

src/process.ts

@@ -2,9 +2,7 @@
 // Licensed under the MIT License.
 
 import cp = require("child_process");
-import fs = require("fs");
-import net = require("net");
-import os = require("os");
+import * as semver from "semver";
 import path = require("path");
 import vscode = require("vscode");
 import { Logger } from "./logging";
@@ -104,14 +102,20 @@ export class PowerShellProcess {
         utils.deleteSessionFile(this.sessionFilePath);
 
         // Launch PowerShell in the integrated terminal
-        this.consoleTerminal =
-            vscode.window.createTerminal({
-                name: this.title,
-                shellPath: this.exePath,
-                shellArgs: powerShellArgs,
-                hideFromUser: !this.sessionSettings.integratedConsole.showOnStartup,
-                cwd: this.sessionSettings.cwd
-            });
+        const terminalOptions: vscode.TerminalOptions = {
+            name: this.title,
+            shellPath: this.exePath,
+            shellArgs: powerShellArgs,
+            hideFromUser: !this.sessionSettings.integratedConsole.showOnStartup,
+            cwd: this.sessionSettings.cwd,
+        };
+
+        // This API is available only in newer versions of VS Code.
+        if (semver.gte(vscode.version, "1.65.0")) {
+            (terminalOptions as any).isTransient = true;
+        }
+
+        this.consoleTerminal = vscode.window.createTerminal(terminalOptions);
 
         const pwshName = path.basename(this.exePath);
         this.log.write(`${pwshName} started.`);

src/session.ts

@@ -660,7 +660,6 @@ export class SessionManager implements Middleware {
             case SessionStatus.Running:
             case SessionStatus.NeverStarted:
             case SessionStatus.NotStarted:
-                // This icon is available since 1.56, now our current engine version.
                 this.statusBarItem.text = "$(terminal-powershell)";
                 // These have to be reset because this function mutates state.
                 this.statusBarItem.color = undefined;
@@ -669,18 +668,11 @@ export class SessionManager implements Middleware {
             case SessionStatus.Initializing:
             case SessionStatus.Stopping:
                 this.statusBarItem.text = "$(sync)";
-                // The warning colors were added later than our current engine version.
-                // https://code.visualstudio.com/api/references/theme-color#status-bar-colors
-                this.statusBarItem.color = (semver.gte(vscode.version, "1.59.0"))
-                    ? new vscode.ThemeColor("statusBarItem.warningForeground")
-                    : new vscode.ThemeColor("statusBarItem.errorForeground");
-                this.statusBarItem.backgroundColor = (semver.gte(vscode.version, "1.59.0"))
-                    ? new vscode.ThemeColor("statusBarItem.warningBackground")
-                    : new vscode.ThemeColor("statusBarItem.errorBackground");
+                this.statusBarItem.color = new vscode.ThemeColor("statusBarItem.warningForeground");
+                this.statusBarItem.backgroundColor = new vscode.ThemeColor("statusBarItem.warningBackground");
                 break;
             case SessionStatus.Failed:
                 this.statusBarItem.text = "$(alert)";
-                // The error colors have been available since 1.53.
                 this.statusBarItem.color = new vscode.ThemeColor("statusBarItem.errorForeground");
                 this.statusBarItem.backgroundColor = new vscode.ThemeColor("statusBarItem.errorBackground");
                 break;