Add support for the VSCode mark sequences*

src/terminal/adapter/ITermDispatch.hpp

@@ -136,6 +136,7 @@ class Microsoft::Console::VirtualTerminal::ITermDispatch
     virtual bool DoITerm2Action(const std::wstring_view string) = 0;
 
     virtual bool DoFinalTermAction(const std::wstring_view string) = 0;
+    virtual bool DoXtermJsAction(const std::wstring_view string) = 0;
 
     virtual StringHandler DownloadDRCS(const VTInt fontNumber,
                                        const VTParameter startChar,

src/terminal/adapter/adaptDispatch.cpp

@@ -3729,6 +3729,13 @@ bool AdaptDispatch::DoFinalTermAction(const std::wstring_view string)
     return false;
 }
 
+// We literally only implement the xterm.js sequences that are aliases for the
+// final term ones. Just implement exactly the same.
+bool AdaptDispatch::DoXtermJsAction(const std::wstring_view string)
+{
+    return DoFinalTermAction(string);
+}
+
 // Method Description:
 // - DECDLD - Downloads one or more characters of a dynamically redefinable
 //   character set (DRCS) with a specified pixel pattern. The pixel array is

src/terminal/adapter/adaptDispatch.hpp

@@ -138,6 +138,7 @@ namespace Microsoft::Console::VirtualTerminal
         bool DoITerm2Action(const std::wstring_view string) override;
 
         bool DoFinalTermAction(const std::wstring_view string) override;
+        bool DoXtermJsAction(const std::wstring_view string) override;
 
         StringHandler DownloadDRCS(const VTInt fontNumber,
                                    const VTParameter startChar,

src/terminal/adapter/termDispatch.hpp

@@ -129,6 +129,7 @@ class Microsoft::Console::VirtualTerminal::TermDispatch : public Microsoft::Cons
     bool DoITerm2Action(const std::wstring_view /*string*/) override { return false; }
 
     bool DoFinalTermAction(const std::wstring_view /*string*/) override { return false; }
+    bool DoXtermJsAction(const std::wstring_view /*string*/) override { return false; }
 
     StringHandler DownloadDRCS(const VTInt /*fontNumber*/,
                                const VTParameter /*startChar*/,

src/terminal/parser/OutputStateMachineEngine.cpp

@@ -417,7 +417,8 @@ bool OutputStateMachineEngine::ActionVt52EscDispatch(const VTID id, const VTPara
 bool OutputStateMachineEngine::ActionCsiDispatch(const VTID id, const VTParameters parameters)
 {
     // Bail out if we receive subparameters, but we don't accept them in the sequence.
-    if (parameters.hasSubParams() && !_CanSeqAcceptSubParam(id, parameters)) [[unlikely]]
+    if (parameters.hasSubParams() && !_CanSeqAcceptSubParam(id, parameters))
+        [[unlikely]]
     {
         return false;
     }
@@ -868,6 +869,11 @@ bool OutputStateMachineEngine::ActionOscDispatch(const wchar_t /*wch*/,
         success = _dispatch->DoFinalTermAction(string);
         break;
     }
+    case OscActionCodes::XtermJsAction:
+    {
+        success = _dispatch->DoXtermJsAction(string);
+        break;
+    }
     default:
         // If no functions to call, overall dispatch was a failure.
         success = false;

src/terminal/parser/OutputStateMachineEngine.hpp

@@ -214,6 +214,7 @@ namespace Microsoft::Console::VirtualTerminal
             ResetBackgroundColor = 111, // Not implemented
             ResetCursorColor = 112,
             FinalTermAction = 133,
+            XtermJsAction = 633,
             ITerm2Action = 1337,
         };