Turns off interpolation per default (#7386)

Co-authored-by: Sebastian Niemann <sn@wertpapiertreuhand.de>

docs/docs/charts/line.mdx

@@ -72,7 +72,7 @@ The line chart allows a number of properties to be specified for each dataset. T
 | [`hoverBorderJoinStyle`](#line-styling) | `string` | Yes | - | `undefined`
 | [`hoverBorderWidth`](#line-styling) | `number` | Yes | - | `undefined`
 | [`label`](#general) | `string` | - | - | `''`
-| [`lineTension`](#line-styling) | `number` | - | - | `0.4`
+| [`lineTension`](#line-styling) | `number` | - | - | `0`
 | [`order`](#general) | `number` | - | - | `0`
 | [`pointBackgroundColor`](#point-styling) | `Color` | Yes | Yes | `'rgba(0, 0, 0, 0.1)'`
 | [`pointBorderColor`](#point-styling) | `Color` | Yes | Yes | `'rgba(0, 0, 0, 0.1)'`

package-lock.json

@@ -1400,6 +1400,127 @@
         "@babel/types": "^7.7.0",
         "eslint-visitor-keys": "^1.0.0",
         "resolve": "^1.12.0"
+      },
+      "dependencies": {
+        "@babel/generator": {
+          "version": "7.9.6",
+          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.9.6.tgz",
+          "integrity": "sha512-+htwWKJbH2bL72HRluF8zumBxzuX0ZZUFl3JLNyoUjM/Ho8wnVpPXM6aUz8cfKDqQ/h7zHqKt4xzJteUosckqQ==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.9.6",
+            "jsesc": "^2.5.1",
+            "lodash": "^4.17.13",
+            "source-map": "^0.5.0"
+          }
+        },
+        "@babel/helper-function-name": {
+          "version": "7.9.5",
+          "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.9.5.tgz",
+          "integrity": "sha512-JVcQZeXM59Cd1qanDUxv9fgJpt3NeKUaqBqUEvfmQ+BCOKq2xUgaWZW2hr0dkbyJgezYuplEoh5knmrnS68efw==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-get-function-arity": "^7.8.3",
+            "@babel/template": "^7.8.3",
+            "@babel/types": "^7.9.5"
+          }
+        },
+        "@babel/helper-get-function-arity": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.8.3.tgz",
+          "integrity": "sha512-FVDR+Gd9iLjUMY1fzE2SR0IuaJToR4RkCDARVfsBBPSP53GEqSFjD8gNyxg246VUyc/ALRxFaAK8rVG7UT7xRA==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.8.3"
+          }
+        },
+        "@babel/helper-split-export-declaration": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.8.3.tgz",
+          "integrity": "sha512-3x3yOeyBhW851hroze7ElzdkeRXQYQbFIb7gLK1WQYsw2GWDay5gAJNw1sWJ0VFP6z5J1whqeXH/WCdCjZv6dA==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.8.3"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.9.0",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
+          "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.9.0",
+            "chalk": "^2.0.0",
+            "js-tokens": "^4.0.0"
+          }
+        },
+        "@babel/parser": {
+          "version": "7.9.6",
+          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.9.6.tgz",
+          "integrity": "sha512-AoeIEJn8vt+d/6+PXDRPaksYhnlbMIiejioBZvvMQsOjW/JYK6k/0dKnvvP3EhK5GfMBWDPtrxRtegWdAcdq9Q==",
+          "dev": true
+        },
+        "@babel/template": {
+          "version": "7.8.6",
+          "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.8.6.tgz",
+          "integrity": "sha512-zbMsPMy/v0PWFZEhQJ66bqjhH+z0JgMoBWuikXybgG3Gkd/3t5oQ1Rw2WQhnSrsOmsKXnZOx15tkC4qON/+JPg==",
+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.8.3",
+            "@babel/parser": "^7.8.6",
+            "@babel/types": "^7.8.6"
+          },
+          "dependencies": {
+            "@babel/code-frame": {
+              "version": "7.8.3",
+              "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
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+              "dev": true,
+              "requires": {
+                "@babel/highlight": "^7.8.3"
+              }
+            }
+          }
+        },
+        "@babel/traverse": {
+          "version": "7.9.6",
+          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.9.6.tgz",
+          "integrity": "sha512-b3rAHSjbxy6VEAvlxM8OV/0X4XrG72zoxme6q1MOoe2vd0bEc+TwayhuC1+Dfgqh1QEG+pj7atQqvUprHIccsg==",
+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.8.3",
+            "@babel/generator": "^7.9.6",
+            "@babel/helper-function-name": "^7.9.5",
+            "@babel/helper-split-export-declaration": "^7.8.3",
+            "@babel/parser": "^7.9.6",
+            "@babel/types": "^7.9.6",
+            "debug": "^4.1.0",
+            "globals": "^11.1.0",
+            "lodash": "^4.17.13"
+          },
+          "dependencies": {
+            "@babel/code-frame": {
+              "version": "7.8.3",
+              "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+              "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+              "dev": true,
+              "requires": {
+                "@babel/highlight": "^7.8.3"
+              }
+            }
+          }
+        },
+        "@babel/types": {
+          "version": "7.9.6",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.9.6.tgz",
+          "integrity": "sha512-qxXzvBO//jO9ZnoasKF1uJzHd2+M6Q2ZPIVfnFps8JJvXy0ZBbwbNOmE6SGIY5XOY6d1Bo5lb9d9RJ8nv3WSeA==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.9.5",
+            "lodash": "^4.17.13",
+            "to-fast-properties": "^2.0.0"
+          }
+        }
       }
     },
     "babel-helper-call-delegate": {

src/elements/element.line.js

@@ -18,7 +18,7 @@ defaults.set(scope, {
 	borderWidth: 3,
 	capBezierPoints: true,
 	fill: true,
-	tension: 0.4
+	tension: 0
 });
 
 defaults.route(scope, ['backgroundColor', 'borderColor'], '', 'color');

test/fixtures/controller.line/cubicInterpolationMode/scriptable.js

@@ -28,7 +28,8 @@ module.exports = {
 					cubicInterpolationMode: function(ctx) {
 						return ctx.datasetIndex === 0 ? 'monotone' : 'default';
 					},
-					fill: false
+					fill: false,
+					tension: 0.4
 				}
 			},
 			layout: {

test/fixtures/controller.line/cubicInterpolationMode/value.js

@@ -25,6 +25,7 @@ module.exports = {
 					borderWidth: 20,
 					cubicInterpolationMode: 'default',
 					fill: false,
+					tension: 0.4
 				}
 			},
 			layout: {