Fix: avoid to select defs or title as parentElement (#840)

* Fix: avoid to select defs or title as parentElement

packages/svgcanvas/rollup.config.js

@@ -6,7 +6,6 @@ import rimraf from 'rimraf'
 import babel from '@rollup/plugin-babel'
 import { nodeResolve } from '@rollup/plugin-node-resolve'
 import commonjs from '@rollup/plugin-commonjs'
-import { terser } from 'rollup-plugin-terser'
 // import progress from 'rollup-plugin-progress';
 import filesize from 'rollup-plugin-filesize'
 
@@ -31,7 +30,6 @@ const config = [{
     }),
     commonjs(),
     babel({ babelHelpers: 'bundled', exclude: [/\/core-js\//] }), // exclude core-js to avoid circular dependencies.
-    terser({ keep_fnames: true }), // keep_fnames is needed to avoid an error when calling extensions.
     filesize()
   ]
 }]

packages/svgcanvas/utilities.js

@@ -962,7 +962,15 @@ export const getStrokedBBox = (elems, addSVGElementsFromJson, pathActions) => {
 export const getVisibleElements = (parentElement) => {
   if (!parentElement) {
     const svgContent = svgCanvas.getSvgContent()
-    parentElement = svgContent.children[0] // Prevent layers from being included
+    for (let i = 0; i < svgContent.children.length; i++) {
+      if (svgContent.children[i].getBBox) {
+        const bbox = svgContent.children[i].getBBox()
+        if (bbox.width !== 0 && bbox.height !== 0 && bbox.width !== 0 && bbox.height !== 0) {
+          parentElement = svgContent.children[i]
+          break
+        }
+      }
+    }
   }
 
   const contentElems = []