Fix missing icons on edge handles.

Makefile

@@ -1,6 +1,7 @@
 
+# --jsmin currently breaks some of our scripts so it is disabled
 bundle:
-	inline-assets --htmlmin --cssmin --jsmin index.html index.bundle.html
+	inline-assets --htmlmin --cssmin index.html index.bundle.html
 
 dev-bundle:
 	inline-assets index.html index.dev.bundle.html

index.html

@@ -45,16 +45,21 @@ <h3 id="edition">Edition 2019</h3>
 
         <!-- A menu element which is shown for selected edges in the editor. -->
         <div id="edge-menu" class="float-menu invisible">
-            <div class="button-row">                
+            <div class="button-row">
+                <img src="img/visibility_off-24px.svg" id="icon-visibility-off" class="gone">
+                <img src="img/visibility_on-24px.svg" id="icon-visibility-on" class="gone">
+                <img src="img/trending_up-24px.svg" id="icon-trending-up" class="gone">
+                <img src="img/trending_down-24px.svg" id="icon-trending-down" class="gone">
+                <img src="img/swap_vert-24px.svg" id="icon-swap-vert" class="gone">
                 <img alt="Toggle observability (O)" id="edge-menu-observability" class="button" src="img/visibility_off-24px.svg" 
-                    src-on="img/visibility_off-24px.svg" src-off="img/visibility_on-24px.svg" 
+                    src-on="icon-visibility-off" src-off="icon-visibility-on"
                     alt-on="Observability off (O)" alt-off="Observability on (O)" 
                     state=""
                 >
                 <img alt="Toggle monotonicity (M)" id="edge-menu-monotonicity" class="button" src="img/trending_up-24px.svg"
-                    src-unspecified="img/trending_up-24px.svg" alt-unspecified="Make activating (M)"
-                    src-activation="img/trending_down-24px.svg" alt-activation="Make inhibiting (M)"
-                    src-inhibition="img/swap_vert-24px.svg" alt-inhibition="Monotonicity off (M)"
+                    src-unspecified="icon-trending-up" alt-unspecified="Make activating (M)"
+                    src-activation="icon-trending-down" alt-activation="Make inhibiting (M)"
+                    src-inhibition="icon-swap-vert" alt-inhibition="Monotonicity off (M)"
                     state=""
                 >
                 <img alt="Remove (⌫)" id="edge-menu-remove" class="button" src="img/delete-24px.svg">

script/UI.js

@@ -415,7 +415,8 @@ let UI = {
 			if (state != observability.getAttribute("state")) {
 				observability.setAttribute("state", state);
 				observability.alt = observability.getAttribute("alt-"+state);
-				observability.src = observability.getAttribute("src-"+state);
+				let iconSource = observability.getAttribute("src-"+state);
+				observability.src = document.getElementById(iconSource).src;
 				// if the hint is visible, it must be showing alt of this button (because the value just changed)
 				hint.textContent = observability.alt;
 			}			
@@ -431,7 +432,8 @@ let UI = {
 		monotonicity.updateState = function(data) {		
 			if (monotonicity.getAttribute("state") != data.monotonicity) {
 				monotonicity.alt = monotonicity.getAttribute("alt-"+data.monotonicity);
-				monotonicity.src = monotonicity.getAttribute("src-"+data.monotonicity);
+				let iconSource = monotonicity.getAttribute("src-"+data.monotonicity);
+				monotonicity.src = document.getElementById(iconSource).src;
 				monotonicity.setAttribute("state", data.monotonicity);
 				// if the hint is visible, it must be showing alt of this button (because the value just changed)
 				hint.textContent = monotonicity.alt;