[PATCH v4] git-gui: Prevent double UTF-8 conversion

["Łukasz Stelmach" <l.stelmach@samsung.com>]

Convert author's name and e-mail address from the UTF-8 (or any other)
encoding in load_last_commit function the same way commit message is
converted.

Amending commits in git-gui without such conversion breaks UTF-8
strings. For example, "\305\201ukasz" (as written by git cat-file) becomes
"\303\205\302\201ukasz" in an amended commit.

Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
Reviewed-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
---
Changes since v3:

- Added Reviewed-by footer. Thank you Johannes Schindelin, for review.

 git-gui/lib/commit.tcl | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/git-gui/lib/commit.tcl b/git-gui/lib/commit.tcl
index 83620b7cb..75ea965da 100644
--- a/git-gui/lib/commit.tcl
+++ b/git-gui/lib/commit.tcl
@@ -25,6 +25,8 @@ You are currently in the middle of a merge that has not been fully completed.  Y
 	set msg {}
 	set parents [list]
 	if {[catch {
+			set name ""
+			set email ""
 			set fd [git_read cat-file commit $curHEAD]
 			fconfigure $fd -encoding binary -translation lf
 			# By default commits are assumed to be in utf-8
@@ -34,9 +36,7 @@ You are currently in the middle of a merge that has not been fully completed.  Y
 					lappend parents [string range $line 7 end]
 				} elseif {[string match {encoding *} $line]} {
 					set enc [string tolower [string range $line 9 end]]
-				} elseif {[regexp "author (.*)\\s<(.*)>\\s(\\d.*$)" $line all name email time]} {
-					set commit_author [list name $name email $email date $time]
-				}
+				} elseif {[regexp "author (.*)\\s<(.*)>\\s(\\d.*$)" $line all name email time]} { }
 			}
 			set msg [read $fd]
 			close $fd
@@ -44,7 +44,13 @@ You are currently in the middle of a merge that has not been fully completed.  Y
 			set enc [tcl_encoding $enc]
 			if {$enc ne {}} {
 				set msg [encoding convertfrom $enc $msg]
+				set name [encoding convertfrom $enc $name]
+				set email [encoding convertfrom $enc $email]
 			}
+			if {$name ne {} && $email ne {}} {
+				set commit_author [list name $name email $email date $time]
+			}
+
 			set msg [string trim $msg]
 		} err]} {
 		error_popup [strcat [mc "Error loading commit data for amend:"] "\n\n$err"]
-- 
2.11.0