fix: Selection.getTextRange respects newlines

Author: lukasbuenger

src/selection.js

@@ -53,7 +53,17 @@ export default class Selection extends Cursor {
   }
 
   getTextRange () {
-    return this.range.toCharacterRange(this.host)
+    const rangeUntilSelection = this.range.cloneRange()
+    rangeUntilSelection.setStart(this.host, 0)
+    rangeUntilSelection.setEnd(this.range.startContainer, this.range.startOffset)
+
+    const numNewLinesBefore = $('<div>' + rangeUntilSelection.toHtml() + '</div>').find('br').length
+    const numNewLinesWithin = $('<div>' + this.range.toHtml() + '</div>').find('br').length
+    const textRange = this.range.toCharacterRange(this.host)
+    return {
+      start: textRange.start + numNewLinesBefore,
+      end: textRange.end + numNewLinesWithin + numNewLinesBefore
+    }
   }
 
   // Get the ClientRects of this selection.