Merge pull request #3625 from paulkaplan/fix-block-drag-index

Layer extension button and monitors below block drag surface

src/css/z-index.css

@@ -4,13 +4,14 @@
     This prevents conflicts between identical z-index values in different components.
 */
 
-$z-index-extension-button: 50; /* Force extension button above the ScratchBlocks flyout */
-$z-index-menu-bar: 50; /* blocklyToolboxDiv is 40 */
-
-$z-index-monitor: 100;
-$z-index-stage-indicator: 110;
-$z-index-add-button: 120;
-$z-index-tooltip: 130; /* tooltips should go over add buttons if they overlap */
+/* Toolbox z-index: 40; set in scratch-blocks */
+$z-index-menu-bar: 41;
+$z-index-extension-button: 42;
+$z-index-stage-indicator: 45;
+$z-index-add-button: 46;
+$z-index-tooltip: 47; /* tooltips should go over add buttons if they overlap */
+$z-index-monitor: 48; /* monitors go over add buttons */
+/* Block drag z-index: 50; set in scratch-blocks */
 
 $z-index-card: 490;
 $z-index-loader: 500;