Add dash attribute support to marker lines across scatter trace types

- Extends marker line styling capabilities by including the `dash` attribute alongside existing `width` attribute
- Enables dashed marker line borders for `scatter3d`, `scattercarpet`, `scattergeo`, `scattergl`, `scatterternary`, and `splom` trace types
- Maintains consistency with base scatter trace marker line attributes by reusing `scatterMarkerLineAttrs.dash`
- Applies appropriate constraints where needed, such as `arrayOk: false` for 3D traces and `editType: 'calc'` for other trace types

Author: chrimaho

src/traces/scatter3d/attributes.js

@@ -150,7 +150,8 @@ var attrs = (module.exports = overrideAll(
 
                 line: extendFlat(
                     {
-                        width: extendFlat({}, scatterMarkerLineAttrs.width, { arrayOk: false })
+                        width: extendFlat({}, scatterMarkerLineAttrs.width, { arrayOk: false }),
+                        dash: extendFlat({}, scatterMarkerLineAttrs.dash, { arrayOk: false })
                     },
                     colorAttributes('marker.line')
                 )

src/traces/scattercarpet/attributes.js

@@ -97,6 +97,7 @@ module.exports = {
             line: extendFlat(
                 {
                     width: scatterMarkerLineAttrs.width,
+                    dash: scatterMarkerLineAttrs.dash,
                     editType: 'calc'
                 },
                 colorScaleAttrs('marker.line')

src/traces/scattergeo/attributes.js

@@ -139,7 +139,8 @@ module.exports = overrideAll(
                 colorbar: scatterMarkerAttrs.colorbar,
                 line: extendFlat(
                     {
-                        width: scatterMarkerLineAttrs.width
+                        width: scatterMarkerLineAttrs.width,
+                        dash: scatterMarkerLineAttrs.dash
                     },
                     colorAttributes('marker.line')
                 ),

src/traces/scattergl/attributes.js

@@ -83,7 +83,8 @@ var attrs = (module.exports = overrideAll(
             opacity: scatterMarkerAttrs.opacity,
             colorbar: scatterMarkerAttrs.colorbar,
             line: extendFlat({}, colorScaleAttrs('marker.line'), {
-                width: scatterMarkerLineAttrs.width
+                width: scatterMarkerLineAttrs.width,
+                dash: scatterMarkerLineAttrs.dash
             })
         }),
         connectgaps: scatterAttrs.connectgaps,

src/traces/scatterternary/attributes.js

@@ -126,6 +126,7 @@ module.exports = {
             line: extendFlat(
                 {
                     width: scatterMarkerLineAttrs.width,
+                    dash: scatterMarkerLineAttrs.dash,
                     editType: 'calc'
                 },
                 colorScaleAttrs('marker.line')

src/traces/splom/attributes.js

@@ -14,6 +14,7 @@ var scatterMarkerLineAttrs = scatterMarkerAttrs.line;
 
 var markerLineAttrs = extendFlat(colorScaleAttrs('marker.line', { editTypeOverride: 'calc' }), {
     width: extendFlat({}, scatterMarkerLineAttrs.width, { editType: 'calc' }),
+    dash: extendFlat({}, scatterMarkerLineAttrs.dash, { editType: 'calc' }),
     editType: 'calc'
 });