Add (large) upper bound on the number of redraw calls

... that Plots.doAutoMargin can trigger.

src/plots/plots.js

@@ -1960,7 +1960,19 @@ plots.doAutoMargin = function(gd) {
         } else {
             fullLayout._redrawFromAutoMarginCount = 1;
         }
-        return Registry.call('plot', gd);
+
+        // Always allow at least one redraw and give each margin-push
+        // call 3 loops to converge. Of course, for most cases this way too many,
+        // but let's keep things on the safe side until we fix our
+        // auto-margin pipeline problems:
+        // https://github.com/plotly/plotly.js/issues/2704
+        var maxNumberOfRedraws = 3 * (1 + Object.keys(pushMarginIds).length);
+
+        if(fullLayout._redrawFromAutoMarginCount < maxNumberOfRedraws) {
+            return Registry.call('plot', gd);
+        } else {
+            Lib.warn('Too many auto-margin redraws.');
+        }
     }
 };