[Bug 57902] kdevelop crashes when discarding changes in file

[Daniel Franke]

Add-on info:
sorry, i was wrong on 'Window Childframe Mode', with history plugin enabled, 
I get a crash in any window mode:

Window Mode				History Plugin			Crash

Window Childframe Mode		yes						yes
Window Childframe Mode		no						no
Tabbed Pages Mode			yes						yes
Tabbed Pages Mode			no						no
Toplevel Window Mode		yes						yes
Toplevel Window Mode		no						no
IDEAI Mode					yes						yes
IDEAI Mode					no						no

	Daniel