patch 9.0.0931: MS-Windows: mouse column limited to 223

Problem:    MS-Windows: mouse column limited to 223.
Solution:   Use two bytes for each mouse coordinate.  Add the mouse position
            to scroll events. (Christopher Plewright, closes #11597)
diff --git a/src/os_win32.c b/src/os_win32.c
index ead50e1..4c97b31 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -2055,17 +2055,23 @@
 		typeahead[typeaheadlen++] = CSI;
 		typeahead[typeaheadlen++] = KS_EXTRA;
 		typeahead[typeaheadlen++] = scroll_dir;
-		g_nMouseClick = -1;
 	    }
 	    else
 	    {
 		typeahead[typeaheadlen++] = ESC + 128;
 		typeahead[typeaheadlen++] = 'M';
 		typeahead[typeaheadlen++] = g_nMouseClick;
-		typeahead[typeaheadlen++] = g_xMouse + '!';
-		typeahead[typeaheadlen++] = g_yMouse + '!';
-		g_nMouseClick = -1;
 	    }
+
+	    // Pass the pointer coordinates of the mouse event in 2 bytes,
+	    // allowing for > 223 columns.  Both for click and scroll events.
+	    // This is the same as what is used for the GUI.
+	    typeahead[typeaheadlen++] = (char_u)(g_xMouse / 128 + ' ' + 1);
+	    typeahead[typeaheadlen++] = (char_u)(g_xMouse % 128 + ' ' + 1);
+	    typeahead[typeaheadlen++] = (char_u)(g_yMouse / 128 + ' ' + 1);
+	    typeahead[typeaheadlen++] = (char_u)(g_yMouse % 128 + ' ' + 1);
+
+	    g_nMouseClick = -1;
 	}
 	else
 	{