Whether this plugin blocks the autohide functionality of the panel.
Use this when you 'popup' something that is visually attached to the plugin at it will look weird for a user if the panel will hide while he/she is working in the popup.
Be sure to use this function as lock/unlock pairs, as a counter is incremented/decremented under the hood. For menus, you can use register_menu which will take care of this.
| this |
an PanelPlugin. |
| blocked |
new blocking state of this plugin. |