Clicking on the disabled toolbar button makes them enabled

[IBM RQM]

Steps to reproduce

1. Disable the CK Editor toolbar button using button.setState(CKEDITOR.TRISTATE_DISABLED)
2. Click on the same button using mouse.

Expected result

Nothing should happen and toolbar button should stay disabled.

Actual result

Clicking the toolbar button, enables it.

Other details (browser, OS, CKEditor version, installed plugins)

CKEditor version 4.5.3.1 Chrome 52 Windows 7

I have debugged the CKEditor code and CKEditor doesn't check the state of the button before performing the Click action. This issue doesn't occur for combo boxes (Format, Font, Size) as CKEditor checks for its state before performing the action.

[Jakub Ś]

You should not be using buttons but commands. Setting below code on editor start, disables the buttons but there are some problems:

1. Image and Table plugins are not selection sensitive so they will be disabled.
2. The panel button like Background Color can only be disabled through ui because there is no command related to it. Again, it is not context/selection sensitive so this code will work.
3. Dropdowns are not related to commands so they can only be disabled through ui. The problem with CKEditor default dropdowns is they are all context/selection sensitive so as soon as you hit any dropdown matching style, the dropdown will get enabled again. Please also see: #13852
4. The same goes for buttons like bold. You can disable them by disabling the command but as soon as you focus bold text, button will get enabled again.

editor.on( 'instanceReady', function( evt ){
    editor.ui.instances.FontSize.setState(CKEDITOR.TRISTATE_DISABLED);
    editor.getCommand('bold').setState( CKEDITOR.TRISTATE_ON );

    editor.getCommand('image').setState( CKEDITOR.TRISTATE_DISABLED );
    editor.getCommand('table').setState( CKEDITOR.TRISTATE_DISABLED );
    editor.ui.instances.BGColor.setState(CKEDITOR.TRISTATE_DISABLED);
});

I think the main problem here is that we are missing some configuration setting or method or TRISTATE_xxx option which could disable the buttons (even these selection sensitive ones) permanently. Additionally it could also disable dropdown and panel buttons which are not related to any command.