unified hoverlabel: remove modebar hover buttons when activated

Author: antoinerg

src/components/modebar/manage.js

@@ -85,6 +85,7 @@ function getButtonGroups(gd) {
     var hasPolar = fullLayout._has('polar');
     var hasSankey = fullLayout._has('sankey');
     var allAxesFixed = areAllAxesFixed(fullLayout);
+    var hasUnifiedHoverLabel = ['x unified', 'y unified'].indexOf(fullLayout.hovermode) !== -1;
 
     var groups = [];
 
@@ -146,7 +147,7 @@ function getButtonGroups(gd) {
     if(hasCartesian) {
         hoverGroup = ['toggleSpikelines', 'hoverClosestCartesian', 'hoverCompareCartesian'];
     }
-    if(hasNoHover(fullData)) {
+    if(hasNoHover(fullData) || hasUnifiedHoverLabel) {
         hoverGroup = [];
     }