lappend cmd -p
        lappend cmd --color
+       set cmd [concat $cmd $repo_config(gui.diffopts)]
        if {$repo_config(gui.diffcontext) >= 1} {
                lappend cmd "-U$repo_config(gui.diffcontext)"
        }
 
                foreach {posbegin colbegin posend colend} $markup {
                        set prefix clr
-                       foreach style [split $colbegin ";"] {
+                       foreach style [lsort -integer [split $colbegin ";"]] {
                                if {$style eq "7"} {append prefix i; continue}
-                               if {$style < 30 || $style > 47} {continue}
+                               if {$style != 4 && ($style < 30 || $style > 47)} {continue}
                                set a "$mark linestart + $posbegin chars"
                                set b "$mark linestart + $posend chars"
                                catch {$ui_diff tag add $prefix$style $a $b}
                                # context line
                                set ln [$ui_diff get $i_l $next_l]
                                set patch "$patch$pre_context$ln"
-                               set n [expr $n+1]
-                               set m [expr $m+1]
+                               # Skip the "\ No newline at end of
+                               # file". Depending on the locale setting
+                               # we don't know what this line looks
+                               # like exactly. The only thing we do
+                               # know is that it starts with "\ "
+                               if {![string match {\\ *} $ln]} {
+                                       set n [expr $n+1]
+                                       set m [expr $m+1]
+                               }
                                set pre_context {}
                        } elseif {$c1 eq $to_context} {
                                # turn change line into context line