Author: Augusto Born de Oliveira <augustoborn@gmail.com>
Makes st respect pixel-resolution hints, makes border dynamic (and independent for x and y), bordepx becomes the minimum border.

--- a/st.c	2014-04-05 14:40:11.000000000 -0400
+++ b/st.c	2014-11-02 15:58:44.651354017 -0500
@@ -221,6 +221,8 @@
 typedef struct {
 	int row;      /* nb row */
 	int col;      /* nb col */
+       int hborderpx;      /* horiz border */
+	int vborderpx;      /* vert border */
 	Line *line;   /* screen */
 	Line *alt;    /* alternate screen */
 	bool *dirty;  /* dirtyness of lines */
@@ -636,7 +638,7 @@
 
 static int
 x2col(int x) {
-	x -= borderpx;
+	x -= term.hborderpx;
 	x /= xw.cw;
 
 	return LIMIT(x, 0, term.col-1);
@@ -644,7 +646,7 @@
 
 static int
 y2row(int y) {
-	y -= borderpx;
+	y -= term.vborderpx;
 	y /= xw.ch;
 
 	return LIMIT(y, 0, term.row-1);
@@ -2799,8 +2801,8 @@
 xtermclear(int col1, int row1, int col2, int row2) {
 	XftDrawRect(xw.draw,
 			&dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
-			borderpx + col1 * xw.cw,
-			borderpx + row1 * xw.ch,
+			term.hborderpx + col1 * xw.cw,
+			term.vborderpx + row1 * xw.ch,
 			(col2-col1+1) * xw.cw,
 			(row2-row1+1) * xw.ch);
 }
@@ -2826,10 +2828,10 @@
 		sizeh->flags = PSize | PResizeInc | PBaseSize;
 		sizeh->height = xw.h;
 		sizeh->width = xw.w;
-		sizeh->height_inc = xw.ch;
-		sizeh->width_inc = xw.cw;
-		sizeh->base_height = 2 * borderpx;
-		sizeh->base_width = 2 * borderpx;
+		sizeh->height_inc = 1;
+		sizeh->width_inc = 1; 
+		sizeh->base_height = 2 * term.vborderpx;
+		sizeh->base_width = 2 * term.hborderpx;
 	} else {
 		sizeh->flags = PMaxSize | PMinSize;
 		sizeh->min_width = sizeh->max_width = xw.fw;
@@ -3018,8 +3020,8 @@
 		xw.w = xw.fw;
 	} else {
 		/* window - default size */
-		xw.h = 2 * borderpx + term.row * xw.ch;
-		xw.w = 2 * borderpx + term.col * xw.cw;
+		xw.h = 2 * term.vborderpx + term.row * xw.ch;
+		xw.w = 2 * term.hborderpx + term.col * xw.cw;
 		xw.fx = 0;
 		xw.fy = 0;
 	}
@@ -3094,7 +3096,7 @@
 
 void
 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
-	int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
+	int winx = term.hborderpx + x * xw.cw, winy = term.vborderpx + y * xw.ch,
 	    width = charlen * xw.cw, xp, i;
 	int frcflags;
 	int u8fl, u8fblen, u8cblen, doesexist;
@@ -3207,7 +3209,7 @@
 
 	/* Intelligent cleaning up of the borders. */
 	if(x == 0) {
-		xclear(0, (y == 0)? 0 : winy, borderpx,
+		xclear(0, (y == 0)? 0 : winy, term.vborderpx,
 			winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
 	}
 	if(x + charlen >= term.col) {
@@ -3215,7 +3217,7 @@
 			((y >= term.row-1)? xw.h : (winy + xw.ch)));
 	}
 	if(y == 0)
-		xclear(winx, 0, winx + width, borderpx);
+		xclear(winx, 0, winx + width, term.hborderpx);
 	if(y == term.row-1)
 		xclear(winx, winy + xw.ch, winx + width, xw.h);
 
@@ -3399,20 +3401,20 @@
 			xdraws(g.c, g, term.c.x, term.c.y, width, sl);
 		} else {
 			XftDrawRect(xw.draw, &dc.col[defaultcs],
-					borderpx + curx * xw.cw,
-					borderpx + term.c.y * xw.ch,
+					term.hborderpx + curx * xw.cw,
+					term.vborderpx + term.c.y * xw.ch,
 					xw.cw - 1, 1);
 			XftDrawRect(xw.draw, &dc.col[defaultcs],
-					borderpx + curx * xw.cw,
-					borderpx + term.c.y * xw.ch,
+					term.hborderpx + curx * xw.cw,
+					term.vborderpx + term.c.y * xw.ch,
 					1, xw.ch - 1);
 			XftDrawRect(xw.draw, &dc.col[defaultcs],
-					borderpx + (curx + 1) * xw.cw - 1,
-					borderpx + term.c.y * xw.ch,
+					term.hborderpx + (curx + 1) * xw.cw - 1,
+					term.vborderpx + term.c.y * xw.ch,
 					1, xw.ch - 1);
 			XftDrawRect(xw.draw, &dc.col[defaultcs],
-					borderpx + curx * xw.cw,
-					borderpx + (term.c.y + 1) * xw.ch - 1,
+					term.hborderpx + curx * xw.cw,
+					term.vborderpx + (term.c.y + 1) * xw.ch - 1,
 					xw.cw, 1);
 		}
 		oldx = curx, oldy = term.c.y;
@@ -3699,6 +3701,9 @@
 	col = (xw.w - 2 * borderpx) / xw.cw;
 	row = (xw.h - 2 * borderpx) / xw.ch;
 
+        term.hborderpx = (xw.w - (col * xw.cw)) / 2;
+        term.vborderpx = (xw.h - (row * xw.ch)) / 2;
+
 	tresize(col, row);
 	xresize(col, row);
 	ttyresize();