Clear connections when editing a new level

js/main.js

@@ -1569,6 +1569,7 @@ class Editor extends PrimaryView {
         }
 
         // Load connections
+        this.connections_g.textContent = '';
         for (let [src, dest] of Object.entries(this.stored_level.custom_trap_wiring)) {
             let [sx, sy] = this.stored_level.scalar_to_coords(src);
             let [dx, dy] = this.stored_level.scalar_to_coords(dest);

style.css

@@ -767,6 +767,7 @@ main.--has-demo .demo-controls {
     line-height: 1;
     background: url(icons/tool-bg-unselected.png) no-repeat;
     border: none;
+    border-radius: 0;
 }
 .icon-button-set button.-selected {
     background-image: url(icons/tool-bg-selected.png);