Custom plugins tooltip error with summernote-lite

[youen-dev]

Checklist

• [x] I've looked at the documentation to make sure the behavior isn't documented and expected.
• [x] I'm sure this is an issue with Summernote, not with my app or other dependencies (Angular, Cordova, React, etc.).
• [x] I've searched through the current issues to make sure this hasn't been reported yet.
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Steps to reproduce

1. Use summernote-lite.js instead of summernote-bs4.js in examples/plugin-hello.html
2. Launch summernote in local with yarn dev and go to http://localhost:3000/examples/plugin-hello.html
3. Hover over the custom plugin button "Hello" -> an error is raised (targetOffset is undefined, in file TooltipUI.js L44)

This error is raised because there is no options.container known by our custom call to ui.button in plugin/hello/summernote-ext-hello.js. This can be quick-fixed with the workaround bellow :

$.extend($.summernote.plugins, {
  ...
  'hello': function(context) {
    ...
    var button = ui.button({
      container: context.options.container,  // -----> Quickfix: add this line.
      contents: '<i class="fa fa-child"/> Hello',
      tooltip: 'hello',
      click: function() {
        ...
      }
    }
  }
});

A better way would be for summernote to set the options.container value implicitly if not already defined. I opened a PR for this : #4740

Expected behavior

The container should be known by buttons created from plugins.

Current behavior

No options.container known, see message above.

Minimal example reproducing the issue

No response

Environment

• Summernote version: v0.9.1 (latest)
• Browser (with version): this issue is browser independant
• OS/Platform (with version): this issue is OS/platform independant