fix the problem where the long narrow yellow brick in vertical
position erases the left border.

It did this, because it was defined as a 2 column 4 row high brick,
where the leftmost column was entirely empty (i.e. white).

I have no clue why the brick was defined this way.
Redefining the brick to be single column 4 row high seems to
work and not have hidden repercussions.

There may be a deeper fix that ``ignores'' the entirely white
column (or masks it away), but I leave that for a more expert fixer.

Axel.

Reference: /n/sources/patch/applied/4s-leftborder-whitening
Date: Wed Jun 15 16:20:18 CES 2005

--- /sys/src/games/4s.c	Wed Jun 15 16:12:36 2005
+++ /sys/src/games/4s.c	Wed Jun 15 16:12:34 2005
@@ -17,9 +17,9 @@
 
 Piece pieces[]={
 	{ 0, 0, 4,1,  { 0,0,  1,0,  1,0,  1,0 }},
-	{ 1, 0, 2,4,  { 1,0,  0,1,  0,1,  0,1 }},
+	{ 1, 0, 1,4,  { 0,0,  0,1,  0,1,  0,1 }},
 	{ 2, 0, 4,1,  { 0,0,  1,0,  1,0,  1,0 }},
-	{ 3, 0, 2,4,  { 1,0,  0,1,  0,1,  0,1 }},
+	{ 3, 0, 1,4,  { 0,0,  0,1,  0,1,  0,1 }},
 
 	{ 0, 1, 3,2,  { 0,0,  1,0,  1,0,  0,1 }},
 	{ 1, 1, 2,3,  { 1,0,  0,1,  0,1, -1,0 }},