Fix hover label exponent hiding or gl3d log hover

Author: rreusser

src/plots/cartesian/axes.js

@@ -1298,6 +1298,17 @@ function formatDate(ax, out, hover, extraPrecision) {
 function formatLog(ax, out, hover, extraPrecision, hideexp) {
     var dtick = ax.dtick,
         x = out.x;
+
+    if(hideexp === 'never') {
+        // If this is a hover label, then we must *never* hide the exponent
+        // for the sake of display, which could give the wrong value by
+        // potentially many orders of magnitude. If hideexp was 'never', then
+        // it's now succeeded by preventing the other condition from automating
+        // this choice. Thus we can unset it so that the axis formatting takes
+        // precedence.
+        hideexp = '';
+    }
+
     if(extraPrecision && ((typeof dtick !== 'string') || dtick.charAt(0) !== 'L')) dtick = 'L3';
 
     if(ax.tickformat || (typeof dtick === 'string' && dtick.charAt(0) === 'L')) {