refactor(link-tool): add JSDoc. Add function to check selectionTarget

Author: akulistus

src/components/inline-tools/inline-tool-link.ts

@@ -51,6 +51,12 @@ export default class LinkInlineTool implements InlineTool {
    */
   private readonly ENTER_KEY: number = 13;
 
+  /**
+   * Popover item block CSS class
+   */
+  private readonly POPOVER_ITEM_CLASSNAME = "ce-popover-item-html";
+
+
   /**
    * Styles
    */
@@ -264,12 +270,12 @@ export default class LinkInlineTool implements InlineTool {
 
       this.selection.restore();
       this.selection.removeFakeBackground();
-
-      // check if other selection happend
-      if (!currentSelection.savedSelectionRange.collapsed) {
-        // and recover new selection after removing fake background
+      
+      // check if other selection happend outside popover element
+      if (this.checkSelectionTarget(currentSelection.savedSelectionRange)) {
+       // and recover new selection
         currentSelection.restore();
-      }
+      } 
     }
 
     this.nodes.input.classList.remove(this.CSS.inputShowed);
@@ -406,4 +412,22 @@ export default class LinkInlineTool implements InlineTool {
   private unlink(): void {
     document.execCommand(this.commandUnlink);
   }
+
+  /**
+   * Checks if the current selection range starts outside
+   * of a popover item element
+   * 
+   * @param range - The DOM Range to evaluate.
+   * @returns `true` if popover item block is selection target otherwise - `false`.
+   */
+  private checkSelectionTarget(range: Range): boolean {
+    const container = range.startContainer;
+    if (container instanceof HTMLElement) {
+      if (container.classList.contains(this.POPOVER_ITEM_CLASSNAME)) {
+        return false;
+      }
+    }
+
+    return true;
+  }
 }