flush that too

src/host/outputStream.cpp

@@ -370,6 +370,17 @@ void ConhostInternalGetSet::NotifyAccessibilityChange(const til::rect& changedRe
     }
 }
 
+void ConhostInternalGetSet::EndConptyFrame()
+{
+    auto& g = ServiceLocator::LocateGlobals();
+    auto& gci = g.getConsoleInformation();
+
+    if (gci.IsInVtIoMode() && g.pRender)
+    {
+        g.pRender->TriggerFlush(false);
+    }
+}
+
 void ConhostInternalGetSet::ReparentWindow(const uint64_t handle)
 {
     // This will initialize s_interactivityFactory for us. It will also

src/host/outputStream.hpp

@@ -67,6 +67,8 @@ class ConhostInternalGetSet final : public Microsoft::Console::VirtualTerminal::
 
     void NotifyAccessibilityChange(const til::rect& changedRect) override;
 
+    void EndConptyFrame() override;
+
     void ReparentWindow(const uint64_t handle);
 
 private:

src/terminal/adapter/adaptDispatch.cpp

@@ -2336,7 +2336,12 @@ bool AdaptDispatch::DoConEmuAction(const std::wstring_view /*string*/) noexcept
 // - false (so that the command gets flushed to terminal)
 bool AdaptDispatch::DoITerm2Action(const std::wstring_view /*string*/) noexcept
 {
-    // TODO! may need to flush manually, to make sure marks end up on the right line, like alt buffer sequence. Maybe.
+    // This is not implemented in conhost.
+
+    // Flush the frame manually, to make sure marks end up on the right line, like the alt buffer sequence.
+    _pConApi->EndConptyFrame();
+
+    // Return false to flush sequence unmodified to ConPTY (if applicable).
     return false;
 }
 

src/terminal/adapter/conGetSet.hpp

@@ -67,6 +67,8 @@ namespace Microsoft::Console::VirtualTerminal
 
         virtual void NotifyAccessibilityChange(const til::rect& changedRect) = 0;
 
+        virtual void EndConptyFrame() = 0;
+
         virtual void ReparentWindow(const uint64_t handle) = 0;
     };
 }