Style: make sure visibility icons are always visible in scene tree

bin/style.css

@@ -222,6 +222,9 @@ input[type=checkbox]:checked:after {
 .hide-scene-tree {
   height: 100%;
 }
+.hide-scene-tree .jstree-container-ul {
+  max-width: 300px;
+}
 .hide-tileselect {
   display: inline-block;
   background-color: #111;

bin/style.less

@@ -235,6 +235,10 @@ input[type=checkbox] {
 
 .hide-scene-tree {
 	height: 100%;
+
+	.jstree-container-ul {
+		max-width: 300px;
+	}
 }
 
 .hide-tileselect {