refactor: append icon children to iconGroup using native DOM API

src/visualizations/config/adapters/dhis_highcharts/customSVGOptions/singleValue/renderer/addIconElement.js

@@ -16,46 +16,14 @@ export function addIconElement(svgString, color) {
      * whitespace around it and makes scaling and translating easier. */
     this.renderer.rect(0, 0, iconElWidth, iconElHeight).add(iconGroup)
 
-    /* The code below makes some assumptions about icon SVGs:
-     * 1. The SVG children are all <path> elements and they are not nested
-     * 2. Only the `d`, `fill-rule`, `clip-rule` and `fill` attributes are used */
     Array.from(svgIconDocument.documentElement.children).forEach((pathNode) => {
-        /* Highcharts expects an array of letters and numbers but the
-         * d-attribute string only puts spaces in between adjacent number,
-         * not between letter and numbers. */
-        const d = pathNode
-            .getAttribute('d')
-            // Add space after letter when followed by number
-            .replace(/([A-Z])([0-9])/g, '$1 $2')
-            // Add space after number when followed by letter
-            .replace(/([0-9])([A-Z])/g, '$1 $2')
-            .split(' ')
-            .map((point) =>
-                isNaN(parseFloat(point)) ? point : parseFloat(point)
-            )
-        const attr = {}
-        const fillRule = pathNode.getAttribute('fill-rule')
-        const clipRule = pathNode.getAttribute('clip-rule')
-        const fill = pathNode.getAttribute('fill')
-
-        if (fillRule) {
-            attr['fill-rule'] = fillRule
-        }
-
-        if (clipRule) {
-            attr['clip-rule'] = clipRule
-        }
-        if (fill) {
-            attr['fill'] = fill
-        }
-
-        this.renderer.path(d).attr(attr).add(iconGroup)
-
-        /* NB: the line below does exactly the same as the lines above,
-         * but does not user the SVGRenderer. We could consider switching
-         * to this if it turns out that not all the assumptions about SVG
-         * icons are correct. */
-        // iconGroup.element.appendChild(pathNode)
+        /* It is also possible to use the SVGRenderer to draw the icon but that
+         * approach is more error prone, so during review it was decided to just
+         * append the SVG children to the iconGroup using native the native DOM
+         * API. For reference see this commit, for an implementation using the
+         * SVVGRenderer:
+         * https://github.com/dhis2/analytics/pull/1698/commits/f95bee838e07f4cdfc3cab6e92f28f49a386a0ad */
+        iconGroup.element.appendChild(pathNode)
     })
 
     iconGroup.add()