Fix various abs() issues.

The abs() function should take an int as argument, but there were
several instances in the code where it was taking an unsigned int or a
double.  In these case, we took one of the following approaches:

* If the argument was a double, use fabs() instead.
* If the argument was unsigned and was certainly going to be positive
  (i.e,. no subtraction), then drop abs() altogether.
* If the argument was unsigned as result of adding or subtracting signed
  and unsigned ints, then we cast all the unsigned ints to signed ints.

WPrefs.app/FontSimple.c

@@ -22,6 +22,7 @@
 #include "WPrefs.h"
 #include <unistd.h>
 #include <fontconfig/fontconfig.h>
+#include <math.h>
 
 /* workaround for older fontconfig, that doesn't define these constants */
 #ifndef FC_WEIGHT_NORMAL
@@ -521,7 +522,7 @@ static void selectedOption(WMWidget * w, void *data)
 				WMListItem *item = WMGetListItem(panel->sizeL, i);
 				int distance;
 
-				distance = abs(size - atoi(item->text));
+				distance = fabs(size - atoi(item->text));
 
 				if (i == 0 || distance < closest) {
 					closest = distance;

src/menu.c

@@ -1436,7 +1436,7 @@ static void getScrollAmount(WMenu * menu, int *hamount, int *vamount)
 
 	} else if (xroot >= (rect.pos.x + rect.size.width - 2) && menuX2 > (rect.pos.x + rect.size.width - 1)) {
 		/* scroll to the left */
-		*hamount = WMIN(MENU_SCROLL_STEP, abs(menuX2 - rect.pos.x - rect.size.width - 1));
+		*hamount = WMIN(MENU_SCROLL_STEP, abs(menuX2 - rect.pos.x - (int)rect.size.width - 1));
 
 		if (*hamount == 0)
 			*hamount = 1;
@@ -1450,7 +1450,7 @@ static void getScrollAmount(WMenu * menu, int *hamount, int *vamount)
 
 	} else if (yroot >= (rect.pos.y + rect.size.height - 2) && menuY2 > (rect.pos.y + rect.size.height - 1)) {
 		/* scroll up */
-		*vamount = WMIN(MENU_SCROLL_STEP, abs(menuY2 - rect.pos.y - rect.size.height - 2));
+		*vamount = WMIN(MENU_SCROLL_STEP, abs(menuY2 - rect.pos.y - (int)rect.size.height - 2));
 
 		*vamount = -*vamount;
 	}

src/moveres.c

@@ -2002,8 +2002,8 @@ static int getResizeDirection(WWindow * wwin, int x, int y, int dy, int flags)
 		int ydir = (abs(y) < (wwin->client.height / 2)) ? UP : DOWN;
 
 		/* How much resize space is allowed */
-		int spacew = abs(wwin->client.width / 3);
-		int spaceh = abs(wwin->client.height / 3);
+		int spacew = wwin->client.width / 3;
+		int spaceh = wwin->client.height / 3;
 
 		/* Determine where x fits */
 		if ((abs(x) > wwin->client.width/2 - spacew/2) &&

src/window.c

@@ -997,9 +997,9 @@ WWindow *wManageWindow(WScreen *scr, Window window)
 				int head;
 
 				x = transientOwner->frame_x +
-				    abs((transientOwner->frame->core->width - width) / 2) + offs;
+					abs(((int)transientOwner->frame->core->width - (int)width) / 2) + offs;
 				y = transientOwner->frame_y +
-				    abs((transientOwner->frame->core->height - height) / 3) + offs;
+					abs(((int)transientOwner->frame->core->height - (int)height) / 3) + offs;
 
 				/* limit transient windows to be inside their parent's head */
 				rect.pos.x = transientOwner->frame_x;

src/xinerama.c

@@ -261,28 +261,28 @@ int wGetHeadRelativeToCurrentHead(WScreen *scr, int current_head, int direction)
 			case DIRECTION_LEFT:
 				if (rect->pos.x < crect.pos.x) {
 					found = 1;
-					distance = abs((rect->pos.x + rect->size.width)
+					distance = abs((rect->pos.x + (int)rect->size.width)
 							- crect.pos.x) + abs(rect->pos.y + crect.pos.y);
 				}
 				break;
 			case DIRECTION_RIGHT:
 				if (rect->pos.x > crect.pos.x) {
 					found = 1;
-					distance = abs((crect.pos.x + crect.size.width)
+					distance = abs((crect.pos.x + (int)crect.size.width)
 							- rect->pos.x) + abs(rect->pos.y + crect.pos.y);
 				}
 				break;
 			case DIRECTION_UP:
 				if (rect->pos.y < crect.pos.y) {
 					found = 1;
-					distance = abs((rect->pos.y + rect->size.height)
+					distance = abs((rect->pos.y + (int)rect->size.height)
 							- crect.pos.y) + abs(rect->pos.x + crect.pos.x);
 				}
 				break;
 			case DIRECTION_DOWN:
 				if (rect->pos.y > crect.pos.y) {
 					found = 1;
-					distance = abs((crect.pos.y + crect.size.height)
+					distance = abs((crect.pos.y + (int)crect.size.height)
 							- rect->pos.y) + abs(rect->pos.x + crect.pos.x);
 				}
 				break;