Please add default edit mode for large buffer. The new dialog is display on every run of JEdit 4.5.0.
in the Editing option pane, you can choose the default behavior when opening a large file :
by default it is "ask" so the dialog always appear, but you can choose your preferred option and this dialog will not appear anymore. Isn't it what you need ?
It is Project Viewer issue maybe. When Jedit is closed and started, there is no project selected. After choosing some project - the dailog always appears.
Did you select an option in the editing option pane ?
If you evaluate this beanshell expression (Utility->Beanshell->Evaluate BeanShell expression)
jEdit.getProperty("largefilemode") what do you get in return ?
The editing option you mention, kpouer, for the default response to a large file, is only in jEdit 5.0pre1, not 4.5.
One would need to use the "updater" to update to the latest daily build if you want to test it.
Already fixed in trunk (5.0pre1).