Handle the BEL, BS, TAB, and CR control characters in the OutputState…

…Machine.

src/terminal/parser/OutputStateMachineEngine.cpp

@@ -39,27 +39,38 @@ ITermDispatch& OutputStateMachineEngine::Dispatch() noexcept
 // - true iff we successfully dispatched the sequence.
 bool OutputStateMachineEngine::ActionExecute(const wchar_t wch)
 {
-    // microsoft/terminal#1825 - VT applications expect to be able to write NUL
-    // and have _nothing_ happen. Filter the NULs here, so they don't fill the
-    // buffer with empty spaces.
-    if (wch == AsciiChars::NUL)
-    {
-        return true;
-    }
-
-    _dispatch->Execute(wch);
-    _ClearLastChar();
-
-    if (wch == AsciiChars::BEL)
+    switch (wch)
     {
+    case AsciiChars::NUL:
+        // microsoft/terminal#1825 - VT applications expect to be able to write NUL
+        // and have _nothing_ happen. Filter the NULs here, so they don't fill the
+        // buffer with empty spaces.
+        break;
+    case AsciiChars::BEL:
+        _dispatch->WarningBell();
         // microsoft/terminal#2952
         // If we're attached to a terminal, let's also pass the BEL through.
         if (_pfnFlushToTerminal != nullptr)
         {
             _pfnFlushToTerminal();
         }
+        break;
+    case AsciiChars::BS:
+        _dispatch->CursorBackward(1);
+        break;
+    case AsciiChars::TAB:
+        _dispatch->ForwardTab(1);
+        break;
+    case AsciiChars::CR:
+        _dispatch->CarriageReturn();
+        break;
+    default:
+        _dispatch->Execute(wch);
+        break;
     }
 
+    _ClearLastChar();
+
     return true;
 }