Wiris MathType and ChemType are missing code where disabling commands disables toolbar buttons

[jswiderski]

📝 Provide detailed reproduction steps (if any)

1. Run CKEditor with the following code :

const commands = [ 'MathType', 'ChemType', 'link' ];
for ( const command of commands ) {
	  const commandToBlock = editor.commands.get( command );
	  commandToBlock.on( 'change:isEnabled', evt => {
		  commandToBlock.isEnabled = false;
		  evt.stop();
	  }, { priority: 'lowest' } );

	  commandToBlock.isEnabled = false;
};

✔️ Expected result

MathType and ChemType plugins toolbar buttons should be disabled and commands should not work.

❌ Actual result

Commands for MathType and ChemType plugins don't work however buttons are enabled which gives the false impression that plugins are working.

📃 Other details

• Browser: Any
• OS: Any
• CKEditor version: Any
• Installed CKEditor plugins: MathType, ChemType

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[FilipTokarski]

This issue is fixed in the new MathType version 7.19.0