gitk: Display submodule diffs with appropriate encoding

Previously, when submodule commit headings contained non-latin-1
characters, they were displayed incorrectly in gitk, because $line was
not properly decoded, for example:

----------------------------- Documentation/Dokko -----------------------------
Submodule Documentation/Dokko 2ca20c7..0ea204d:
  > ��о�окол� �оп��жени� ��С "�о��ик-21631"  (��2 и Сандал)
  > hardware: док�мен�а�и� на InnoDisk SATA 10000
  > hardware: док�мен�а�и� на IEI PCISA-6770E2 v3.0
  > hardware: док�мен�а�и� на Fastwel NIB941
  > hardware: док�мен�а�и� на IEI IPX-9S
  > hardware: док�мен�а�и� на Hirschmann 5TX-EEC

instead of

----------------------------- Documentation/Dokko -----------------------------
Submodule Documentation/Dokko 2ca20c7..0ea204d:
  > Протоколы сопряжения ИМС "Мостик-21631"  (ЛИ2 и Сандал)
  > hardware: документация на InnoDisk SATA 10000
  > hardware: документация на IEI PCISA-6770E2 v3.0
  > hardware: документация на Fastwel NIB941
  > hardware: документация на IEI IPX-9S
  > hardware: документация на Hirschmann 5TX-EEC

This fixes it.

Signed-off-by: Kirill Smelkov <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>

Author: navytux

gitk

@@ -7689,8 +7689,10 @@ proc getblobdiffline {bdf ids} {
 	    makediffhdr $fname $ids
 	    $ctext insert end "\n$line\n" filesep
 	} elseif {![string compare -length 3 "  >" $line]} {
+	    set line [encoding convertfrom $diffencoding $line]
 	    $ctext insert end "$line\n" dresult
 	} elseif {![string compare -length 3 "  <" $line]} {
+	    set line [encoding convertfrom $diffencoding $line]
 	    $ctext insert end "$line\n" d0
 	} elseif {$diffinhdr} {
 	    if {![string compare -length 12 "rename from " $line]} {