Intellij IDEA: Pinned tabs, close will close. How to disable?

I have a hotkey for closing tabs, CTRL + W but it closes even pinned tabs.

So does the [X] on the tabs.

And so does the right click -> close tab.

Is this a bug?

It didn't use to be like this.

I am on intellij 13

There is a 3rd-party plugin available since 2016 that lets you disable closing pinned tabs:

https://plugins.jetbrains.com/plugin/8442-a-prevent-pinned-tabs-from-closing-plugin--by-momomo-com

It hides the X button from the tab. However you also have to manually update your key mapping:

1. Open preferences
2. select Keymap
3. search "momomo" (the plugin author)
4. select "Close Unless Pinned"
5. Press CTRL+W (or CMD+W on macOS)

Now you will be prevented from closing the tab via the keyboard or mouse, unless you unpin it first.