[terminal_renderer] Fixes rendering of U+E0B2  in pixel-perfect box drawing mode (#707).

Changelog.md

@@ -12,6 +12,7 @@
 - Fixes VT sequence for setting indexed color from palette.
 - Fixes some config false positives error messages.
 - Fixes command line arguments parser handling of `--` for switching to verbatim mode (#670).
+- Fixes rendering of U+E0B2  in pixel-perfect box drawing mode (#707).
 - Changes `XTSMGRAPHICS` to match implementation of xterm *exactly* when querying sixel image limits, to be capped at terminal viewport dimensions (#656).
 - Win32: Attaches to parent console if present, so typing `contour help` in a terminal actually shows something.
 - Implements UTF-8 encoded mouse transport (`CSI ? 1005 h`)

src/terminal_renderer/BoxDrawingRenderer.cpp

@@ -602,7 +602,10 @@ namespace detail
         template <Dir Direction, int DivisorX>
         auto getTriangleProps(ImageSize size)
         {
-            auto const c = Point { unbox<int>(size.width) / DivisorX, unbox<int>(size.height) / 2 };
+            auto const c =
+                Point { Direction == Dir::Left ? unbox<int>(size.width) / DivisorX
+                                               : unbox<int>(size.width) - unbox<int>(size.width) / DivisorX,
+                        unbox<int>(size.height) / 2 };
             auto const w = unbox<int>(size.width) - 1;
             auto const h = unbox<int>(size.height) - 1;