fix: terminal shellCommand execution on Windows

Wait for shell prompt before writing command instead of firing
immediately after PTY spawn. Use \r (carriage return) instead of \n
for command submission, matching what xterm.js sends for Enter.

Author: abose

src/extensionsIntegrated/Terminal/TerminalInstance.js

@@ -108,6 +108,12 @@ define(function (require, exports, module) {
         this._webglAddon = null;
         this._lastDpr = null;
 
+        // Promise that resolves when the shell sends its first output (prompt ready)
+        this._firstDataResolve = null;
+        this.firstDataReceived = new Promise(function (resolve) {
+            this._firstDataResolve = resolve;
+        }.bind(this));
+
         // Bound event handlers for cleanup
         this._onTerminalData = this._onTerminalData.bind(this);
         this._onTerminalExit = this._onTerminalExit.bind(this);
@@ -217,6 +223,10 @@ define(function (require, exports, module) {
     TerminalInstance.prototype._onTerminalData = function (_event, eventData) {
         if (eventData.id === this.id && this.terminal) {
             this.terminal.write(eventData.data);
+            if (this._firstDataResolve) {
+                this._firstDataResolve();
+                this._firstDataResolve = null;
+            }
         }
     };
 

src/extensionsIntegrated/Terminal/main.js

@@ -557,9 +557,11 @@ define(function (require, exports, module) {
             await _createNewTerminal();
             const active = _getActiveTerminal();
             if (active && active.isAlive) {
+                // Wait for the shell to output its prompt before sending the command.
+                await active.firstDataReceived;
                 nodeConnector.execPeer("writeTerminal", {
                     id: active.id,
-                    data: options.shellCommand + "\n"
+                    data: options.shellCommand + "\r"
                 });
             }
             return;