X11: Fix map expose area

The stop_row and stop_col were off-by-one in some cases, leaving
black lines on the map when a window on top was closed.
Simplify the calculation by always going one row/col further,
ensuring previously covered area gets redrawn for sure.
This should not affect speed or resource usage noticeably these days.

doc/fixes37.0

@@ -1414,6 +1414,7 @@ Unix: can define NOSUSPEND in config.h or src/Makefile's CFLAGS to prevent
 X11: implement 'selectsaved', restore via menu of saved games
 X11: echo getline prompt and response (wishes, applying names) to message
 	window and dumplog message history
+X11: fix map expose area, no longer leaving black bars on the map
 
 
 NetHack Community Patches (or Variation) Included

win/X11/winmap.c

@@ -1199,12 +1199,10 @@ map_exposed(Widget w, XtPointer client_data, /* unused */
         t_width = map_info->text_map.square_width;
     }
     start_row = y / t_height;
-    stop_row = ((y + height) / t_height)
-               + ((((y + height) % t_height) == 0) ? 0 : 1) - 1;
+    stop_row = ((y + height) / t_height) + 1;
 
     start_col = x / t_width;
-    stop_col = ((x + width) / t_width)
-               + ((((x + width) % t_width) == 0) ? 0 : 1) - 1;
+    stop_col = ((x + width) / t_width) + 1;
 
 #ifdef VERBOSE
     printf("map_exposed: x = %d, y = %d, width = %d, height = %d\n", x, y,