MaterialRichEditor - ToolbarButtons have a hard coded tabindex of -1

[chamgda]

ToolbarButtons having a hard coded tabindex of -1 makes it impossible to control the editor with a keyboard. This should either be configurable or the tabindex should have a default of 0 because of keyboard accessibility.

[kevzlou7979]

Oh I see, I think this was a default implementation of the library we've used, I will take a look if we can dynamically get the widget and preset the tab-index value.