BUG: editor.Panels.removeButton('options', 'preview') breaks View code

Hi @rudym87 !

The problem seems to be caused by the deactivation of the button clicked to run the command (cf below), which causes the modal to instantly close.

https://github.com/artf/grapesjs/blob/a85126883fbeafe3a437b1421b952931a5aaafc0/src/commands/view/ExportTemplate.js#L5-L7

I have no idea why it only happens when the preview button has been removed, still it seems wierd to me to deactivate it while the code modal is still opened. I think it should rather be stored & disabled once the modal is closed (on stop), that way the button would stay active while the modal is open as shown in the following screenshot:

This fixes the aforementioned problem, & is also visually more coherent in my opinion. @artf what do you think ? As always, I'd be happy to open a PR for this :) !

Cheers !

correct @mcottret, honestly, I don't even see the reason anymore to keep this command stateful. So, I'd remove that useless sender.set('active', 0) and the stop function from it. Let me know if you have a better idea