[IMP] Modifier : Add a preserve property on Modifier

This property is used to determine if a modifier should be kept after a break line or not.

Author: sebgeelen

packages/core/src/Modifier.ts

@@ -8,6 +8,7 @@ export interface Modifier {
     constructor: ModifierConstructor & this;
 }
 export class Modifier {
+    preserve = true;
     get name(): string {
         return '';
     }

packages/plugin-char/src/Char.ts

@@ -47,7 +47,12 @@ export class Char<T extends JWPluginConfig = JWPluginConfig> extends JWPlugin<T>
         const range = params.context.range;
         const text = params.text;
         const inline = this.editor.plugins.get(Inline);
-        const modifiers = inline.getCurrentModifiers(range);
+        let modifiers = inline.getCurrentModifiers(range);
+        // Ony preserved modifiers are applied at the start of a container.
+        const previousSibling = range.start.previousSibling();
+        if (!previousSibling) {
+            modifiers = new Modifiers(...modifiers.filter(mod => mod.preserve));
+        }
         if (params.formats) {
             modifiers.set(...params.formats.map(format => format.clone()));
         }

packages/plugin-link/src/LinkFormat.ts

@@ -4,6 +4,7 @@ import { Attributes } from '../../plugin-xml/src/Attributes';
 export class LinkFormat extends Format {
     constructor(url = '#', target = '') {
         super('A');
+        this.preserve = false;
         this.url = url;
         this.target = target;
     }

packages/plugin-xml/src/Attributes.ts

@@ -5,6 +5,9 @@ import { ClassList } from './ClassList';
 export class Attributes extends Modifier {
     private _record: Record<string, string> = {};
     style = new CssStyle();
+    // Avoid copiying FontAwesome classes on paragraph break.
+    // TODO : need to be improved to better take care of color classes, etc.
+    preserve = false;
     classList = new ClassList();
     constructor(attributes?: Attributes | NamedNodeMap | Record<string, string>) {
         super();