resistance: update documentation + default strength value

docs/labwc-config.5.scd

@@ -155,6 +155,15 @@ Configuration must be wrapped in a <labwc_config> root-node.
 	any motion events while a keyboard is typing, and for a short while
 	after as well. 
 
+
+# RESISTANCE
+
+*<resistance>screenEdgeStrength>*
+	Screen Edge Strength is how far past the screen's edge your cursor must
+	move before the window will move with it. Resistance is counted in
+	pixels. <core><gap> influences where the the screen's edge is at.
+	Default is 20 pixels.
+
 # SEE ALSO
 
 labwc(1), labwc-actions(5), labwc-theme(5)

docs/rc.xml.all

@@ -144,4 +144,9 @@
     </device>
   </libinput>
 
+  <!-- edge strength is in pixels -->
+  <resistance>
+    <screenEdgeStrength>20</screenEdgeStrength>
+  </resistance>
+
 </labwc_config>

src/config/rcxml.c

@@ -419,7 +419,7 @@ rcxml_init()
 	rc.doubleclick_time = 500;
 	rc.repeat_rate = 25;
 	rc.repeat_delay = 600;
-	rc.screen_edge_strength = 0;
+	rc.screen_edge_strength = 20;
 }
 
 static struct {