Fix s-table header dragging (#2770)

css/stable.css

@@ -1,5 +1,4 @@
 .stable {
-  position: relative;  /* Need to be positioned for drag masks to be positioned properly */
   height: 100%;
   background-color: #FFFFFF;
   overflow: hidden;
@@ -11,6 +10,7 @@
 }
 .stable td {font: menu; white-space: nowrap; padding: 1px}
 .stable-head {
+  position: relative;  /* Need to be positioned for drag masks to be positioned properly */
   width: 100%;
   flex: 0 0 auto;
   background: #F5F5F5;

index.html

@@ -179,7 +179,7 @@ <h4 class="offcanvas-title" id="offcanvas-sidepanel-label"></h4>
 			<div id="HDivider" class="p-0 m-0"></div>
 			<div id="main-info" class="d-flex flex-column align-items-stretch flex-grow-1 flex-shrink-1 overflow-hidden">
 				<div id="list-table" class="flex-grow-1 flex-shrink-1 overflow-hidden">
-					<div id="List" class="h-100"></div>
+					<div id="List"></div>
 				</div>
 				<div id="VDivider" class="p-0 m-0"></div>
 				<div id="tdetails">