abcdef hijklmn	pqrstuvwxyz_1060ABCDEFGHIJKLMNOP 

Test 1: set linebreak
    abcdef          
+hijklmn            
+pqrstuvwxyz_1060ABC
+DEFGHIJKLMNOP      

Test 2: set linebreak + set list
^Iabcdef hijklmn^I  
+pqrstuvwxyz_1060ABC
+DEFGHIJKLMNOP      
                    

Test 3: set linebreak nolist
    abcdef          
+hijklmn            
+pqrstuvwxyz_1060ABC
+DEFGHIJKLMNOP      
1	aaaaaaaaaaaaaaaaaa

Test 4: set linebreak with tab and 1 line as long as screen: should break!
1                   
+aaaaaaaaaaaaaaaaaa 
~                   
~                   
_S_	 bla

Test 5: set linebreak with conceal and set list and tab displayed by different char (line may not be truncated)
Sabbbbbb bla        
~                   
~                   
~                   
this not
aaaaaaaaaaaaa
REMOVE: 
REMOVE: