change polar bargap 0.2 -> 0.2

Author: etpinard

src/traces/barpolar/layout_attributes.js

@@ -25,16 +25,16 @@ module.exports = {
     },
     bargap: {
         valType: 'number',
-        // TODO is this correct?
-        // I think 0.2 (like for bars) is a little much, maybe 0.1 would work better?
-        dflt: 0.2,
+        dflt: 0.1,
         min: 0,
         max: 1,
         role: 'style',
         editType: 'calc',
         description: [
-            'Sets the gap (in plot ??angular?? fraction) between bars of',
-            'adjacent location coordinates.'
+            'Sets the gap between bars of',
+            'adjacent location coordinates.',
+            'Values are unitless, they represent fractions of the minimum difference',
+            'in bar positions in the data.'
         ].join(' ')
     }
 };

test/image/baselines/polar_bar-overlay.png

@@ -93,8 +93,8 @@ describe('Test barpolar hover:', function() {
         yval: 0,
         exp: {
             index: 1,
-            x: 302.48,
-            y: 125.55,
+            x: 296.32,
+            y: 117.74,
             extraText: 'r: 2<br>θ: 90°',
             color: '#1f77b4'
         }