patch 9.2.0187: MS-Windows: rendering artifacts with DirectX renderer

Problem:  MS-Windows: rendering artifacts with DirectX renderer
Solution: Enable ETO_CLIPPED for DirectWrite rendering in
          gui_mch_draw_string() to ensure glyphs stay within their
          cell boundaries (Yasuhiro Matsumoto).

closes: #19711

Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/gui_w32.c

@@ -6666,6 +6666,16 @@ gui_mch_draw_string(
 	    pcliprect = &rc;
 	    foptions = ETO_CLIPPED;
 	}
+#ifdef FEAT_DIRECTX
+	// DirectWrite anti-aliasing can extend glyph pixels beyond cell
+	// boundaries, leaving artifacts when adjacent cells are not
+	// redrawn.  Clip to the cell rect to prevent this.
+	else if (IS_ENABLE_DIRECTX())
+	{
+	    pcliprect = &rc;
+	    foptions = ETO_CLIPPED;
+	}
+#endif
     }
     SetTextColor(s_hdc, gui.currFgColor);
     SelectFont(s_hdc, gui.currFont);

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    187,
 /**/
     186,
 /**/