very confident we can get all the logic into the sxnui

(cherry picked from commit 57a5327)

src/cascadia/TerminalApp/SuggestionsControl.cpp

@@ -1051,15 +1051,28 @@ namespace winrt::TerminalApp::implementation
         }
     }
 
-    void SuggestionsControl::Anchor(Windows::Foundation::Point anchor, Windows::Foundation::Size space)
+    void SuggestionsControl::Anchor(Windows::Foundation::Point anchor,
+                                    Windows::Foundation::Size space)
     {
         _anchor = anchor;
         _space = space;
 
         // TODO! do some clamping
 
+        const til::size actualSize{ til::math::rounding, ActualWidth(), ActualHeight() };
+        // First, position horizonally.
+        //
+        // We want to align the left edge of the text within the control to the
+        // cursor position. We'll need to scoot a little to the left, to align
+        // text with cursor
+        const auto proposedX = gsl::narrow_cast<int>(_anchor.X - 40);
+        // If the control is too wide to fit in the window, clamp it fit inside
+        // the window.
+        const auto maxX = gsl::narrow_cast<int>(space.Width - actualSize.width);
+        const auto clampedX = std::clamp(proposedX, 0, maxX);
+
         // // Create a thickness for the new margins
-        auto newMargin = Windows::UI::Xaml::ThicknessHelper::FromLengths(_anchor.X, 0, 0, 0);
+        auto newMargin = Windows::UI::Xaml::ThicknessHelper::FromLengths(clampedX, 0, 0, 0);
 
         // // SuggestionsPopup().HorizontalOffset(clampedX);
 
@@ -1070,14 +1083,14 @@ namespace winrt::TerminalApp::implementation
             //     // extending below. This is easy, we can just use the cursor as the
             //     // origin (more or less)
             //     // SuggestionsPopup().VerticalOffset(realCursorPos.y + characterSize.Height);
-            newMargin.Top = (_anchor.Y + 16); // TODO! 16 is cursor height
+            newMargin.Top = (_anchor.Y);
         }
         else
         {
             //     // Position at the cursor. The suggestions UI itself will maintian
             //     // its own offset such that it's always above its origin
             //     // SuggestionsPopup().VerticalOffset(realCursorPos.y);
-            newMargin.Top = (_anchor.Y - ActualHeight());
+            newMargin.Top = (_anchor.Y - actualSize.height);
         }
         Margin(newMargin);
     }

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -4539,6 +4539,7 @@ namespace winrt::TerminalApp::implementation
         const auto controlTransform = control.TransformToVisual(this->Root());
         const til::point controlOrigin{ til::math::rounding, controlTransform.TransformPoint(Windows::Foundation::Point{ 0, 0 }) };
         const til::point realCursorPos = controlOrigin + cursorPos;
+        // const til::point anchor = realCursorPos + til::point{ 0, characterSize.Height };
 
         const auto currentWindow = CoreWindow::GetForCurrentThread();
         const auto currentWindowBounds = currentWindow.Bounds();
@@ -4550,18 +4551,28 @@ namespace winrt::TerminalApp::implementation
         const til::size windowDimensions{ til::math::rounding, ActualWidth(), ActualHeight() };
 
         // Is there space in the window below the cursor to open the menu downwards?
-        const bool canOpenDownwards = ((realCursorPos.y) + characterSize.Height + maxSize.Height) < windowDimensions.height;
-
-        const auto direction = canOpenDownwards ? TerminalApp::SuggestionsDirection::TopDown :
-                                                  TerminalApp::SuggestionsDirection::BottomUp;
-
-        sxnUi.Direction(direction);
-        sxnUi.Anchor(realCursorPos.to_winrt_point(), windowDimensions.to_winrt_size());
+        // const bool canOpenDownwards = ((realCursorPos.y) + characterSize.Height + maxSize.Height) < windowDimensions.height;
+
+        // const auto direction = canOpenDownwards ? TerminalApp::SuggestionsDirection::TopDown :
+        //                                           TerminalApp::SuggestionsDirection::BottomUp;
+        const til::size actualSuggestionsSizeBefore{ til::math::rounding, sxnUi.ActualWidth(), sxnUi.ActualHeight() };
+        actualSuggestionsSizeBefore;
+        // sxnUi.Direction(direction);
+        // sxnUi.Anchor(realCursorPos.to_winrt_point(), windowDimensions.to_winrt_size());
         sxnUi.Mode(mode);
 
         // SuggestionsPopup().IsOpen(true);
         sxnUi.SetCommands(commandsCollection);
         sxnUi.Visibility(commandsCollection.Size() > 0 ? Visibility::Visible : Visibility::Collapsed);
+        const til::size actualSuggestionsSizeAfter{ til::math::rounding, sxnUi.ActualWidth(), sxnUi.ActualHeight() };
+        actualSuggestionsSizeAfter;
+
+        const bool canOpenDownwards = ((realCursorPos.y) + characterSize.Height + actualSuggestionsSizeAfter.height) < windowDimensions.height;
+        const auto direction = canOpenDownwards ? TerminalApp::SuggestionsDirection::TopDown :
+                                                  TerminalApp::SuggestionsDirection::BottomUp;
+        const auto anchor = realCursorPos + til::point{ til::math::rounding, 0.0f, canOpenDownwards ? characterSize.Height : 0 };
+        sxnUi.Anchor(anchor.to_winrt_point(), windowDimensions.to_winrt_size());
+        sxnUi.Direction(direction);
 
         // // Position the suggestions UI relative to the actual term control.
         // //