Pasting error in table when using custom sanitizer

[seonim-ryu]

Describe the bug

When using the customHTMLSanitizer option, a script error occurs when pasting data in a WYSIWYG table.

const editor = new Editor({
  // ...
  customHTMLSanitizer: html => {
    return sanitize(html); // user's sanitizer
  }
});

To Reproduce

Steps to reproduce the behavior:

1. Create a table in WYSIWYG and paste the data into table cells.
2. Paste normal data or copy and paste cells within a table.
3. Pasting is not possible due to a script error.

Expected behavior

When pasting data in a table, it should behave the same as a normal paste.

Cause

When pasting in a table, an error occurs because the paste value is processed as a string when no sanitizer is used or a custom sanitizer is used.

tui.editor/apps/editor/src/js/wwPasteContentHelper.js

Line 115 in d0a1c47

container.innerHTML = sanitizer(container.innerHTML, true);

tui.editor/apps/editor/src/js/wwTablePasteHelper.js

Line 129 in d0a1c47

container.appendChild(sanitizer ? sanitizer(html) : html);

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context

Sanitizer specification for paste

When pasting, the sanitizer behavior should be changed to run the default sanitizer used inside the Editor and then run customHTMLSanitizer.

Return value of custom sanitizer

The sanitized value should be returned as a string.