From aacfbf6f3c1184c8a012bad20300ba3bc78af0eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89tienne=20T=C3=A9treault-Pinard?= <etienne@plot.ly>
Date: Wed, 22 May 2019 16:11:18 -0400
Subject: [PATCH] push kde hover label item before q1/median/q3

... so that hoverAvoirOverlaps in Fx.hover can do its job
    properly.
---
 src/components/fx/hover.js                |   2 +-
 src/traces/violin/hover.js                |   8 +-
 test/image/baselines/violin_zoomed-in.png | Bin 0 -> 17763 bytes
 test/image/mocks/violin_zoomed-in.json    | 274 ++++++++++++++++++++++
 test/jasmine/tests/violin_test.js         |  34 +++
 5 files changed, 313 insertions(+), 5 deletions(-)
 create mode 100644 test/image/baselines/violin_zoomed-in.png
 create mode 100644 test/image/mocks/violin_zoomed-in.json

diff --git a/src/components/fx/hover.js b/src/components/fx/hover.js
index 7fe5f429c81..a32ad3f0922 100644
--- a/src/components/fx/hover.js
+++ b/src/components/fx/hover.js
@@ -1177,7 +1177,7 @@ function hoverAvoidOverlaps(hoverLabels, ax, fullLayout) {
         donepositioning = true;
         i = 0;
         while(i < pointgroups.length - 1) {
-                // the higher (g0) and lower (g1) point group
+            // the higher (g0) and lower (g1) point group
             var g0 = pointgroups[i];
             var g1 = pointgroups[i + 1];
 
diff --git a/src/traces/violin/hover.js b/src/traces/violin/hover.js
index 184e41744c7..30305e4b87e 100644
--- a/src/traces/violin/hover.js
+++ b/src/traces/violin/hover.js
@@ -26,10 +26,6 @@ module.exports = function hoverPoints(pointData, xval, yval, hovermode, hoverLay
     if(hasHoveronViolins || hasHoveronKDE) {
         var closeBoxData = boxHoverPoints.hoverOnBoxes(pointData, xval, yval, hovermode);
 
-        if(hasHoveronViolins) {
-            closeData = closeData.concat(closeBoxData);
-        }
-
         if(hasHoveronKDE && closeBoxData.length > 0) {
             var xa = pointData.xa;
             var ya = pointData.ya;
@@ -82,6 +78,10 @@ module.exports = function hoverPoints(pointData, xval, yval, hovermode, hoverLay
                 violinLineAttrs[vLetter + '1'] = violinLineAttrs[vLetter + '2'] = vAxis._offset + vValPx;
             }
         }
+
+        if(hasHoveronViolins) {
+            closeData = closeData.concat(closeBoxData);
+        }
     }
 
     if(hoveron.indexOf('points') !== -1) {
diff --git a/test/image/baselines/violin_zoomed-in.png b/test/image/baselines/violin_zoomed-in.png
new file mode 100644
index 0000000000000000000000000000000000000000..ae8e8e3225b754e2c7882f75f76e7509e1dc2024
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diff --git a/test/image/mocks/violin_zoomed-in.json b/test/image/mocks/violin_zoomed-in.json
new file mode 100644
index 00000000000..3894212df73
--- /dev/null
+++ b/test/image/mocks/violin_zoomed-in.json
@@ -0,0 +1,274 @@
+{
+  "data": [
+    {
+      "box": {
+        "visible": true
+      },
+      "fillcolor": "#8dd3c7",
+      "line": {
+        "color": "black"
+      },
+      "meanline": {
+        "visible": true
+      },
+      "opacity": 0.6,
+      "type": "violin",
+      "x0": "Total Bill",
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+        15.53,
+        10.07,
+        12.6,
+        32.83,
+        35.83,
+        29.03,
+        27.18,
+        22.67,
+        17.82,
+        18.78
+      ]
+    }
+  ],
+  "layout": {
+    "xaxis": {
+      "range": [-0.125, 0.125]
+    },
+    "yaxis": {
+      "range": [-18, 35],
+      "zeroline": false
+    }
+  }
+}
diff --git a/test/jasmine/tests/violin_test.js b/test/jasmine/tests/violin_test.js
index d4ac9aa4698..ab4bb5ed657 100644
--- a/test/jasmine/tests/violin_test.js
+++ b/test/jasmine/tests/violin_test.js
@@ -724,6 +724,40 @@ describe('Test violin hover:', function() {
             .then(done);
         });
     });
+
+    it('labels should avoid overlaps', function(done) {
+        gd = createGraphDiv();
+
+        var fig = Lib.extendDeep({}, require('@mocks/violin_zoomed-in.json'));
+        fig.layout.width = 700;
+        fig.layout.height = 450;
+
+        Plotly.plot(gd, fig)
+        .then(function() {
+            mouseEvent('mousemove', 350, 225);
+
+            var actual = [];
+            d3.selectAll('g.hovertext').each(function() {
+                var bbox = this.getBoundingClientRect();
+                var tx = d3.select(this).text();
+                actual.push([tx, bbox]);
+            });
+
+            actual = actual.sort(function(a, b) { return a[1].top - b[1].top; });
+
+            expect(actual.length).toBe(7, '# of value hover labels');
+
+            for(var i = 0; i < actual.length - 1; i++) {
+                var a = actual[i];
+                var b = actual[i + 1];
+                if(b[1].top < a[1].bottom) {
+                    fail('Labels ' + a[0] + ' and ' + b[1] + ' overlap.');
+                }
+            }
+        })
+        .catch(failTest)
+        .then(done);
+    });
 });
 
 describe('Test violin restyle:', function() {