gitk: Show notes by default (like git log does)

Starting from ~ git-1.6.6, log, show & whatchanged show notes by default.

On the other hand, gitk does not show notes by default, because under
the hood it calls 'git log --pretty=raw ...' to get the log, and in
'git log' notes are turned off when user specifies format or pretty
settings.

Yes, it is possible to invoke 'gitk --show-notes' explicitly, but since
from user's perspective, gitk is gui enabled git log, it would be
logical for gitk to show notes by default too for consistency.

In git, --show-notes was introduced in 66b2ed (Fix "log" family not to
be too agressive about showing notes) which predates 1.6.6.2.

Notes can still be supressed with 'gitk --no-notes'.

Cc: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: NKirill Smelkov <kirr@mns.spb.ru>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

gitk

@@ -313,6 +313,7 @@ proc start_rev_list {view} {
     global viewactive viewinstances vmergeonly
     global mainheadid viewmainheadid viewmainheadid_orig
     global vcanopt vflags vrevs vorigargs
+    global show_notes
 
     set startmsecs [clock clicks -milliseconds]
     set commitidx($view) 0
@@ -361,8 +362,8 @@ proc start_rev_list {view} {
     }
 
     if {[catch {
-	set fd [open [concat | git log --no-color -z --pretty=raw --parents \
-			 --boundary $args "--" $files] r]
+	set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
+			--parents --boundary $args "--" $files] r]
     } err]} {
 	error_popup "[mc "Error executing git log:"] $err"
 	return 0
@@ -456,6 +457,7 @@ proc updatecommits {} {
     global mainheadid viewmainheadid viewmainheadid_orig pending_select
     global isworktree
     global varcid vposids vnegids vflags vrevs
+    global show_notes
 
     set isworktree [expr {[exec git rev-parse --is-inside-work-tree] == "true"}]
     rereadrefs
@@ -508,8 +510,8 @@ proc updatecommits {} {
 	set args $vorigargs($view)
     }
     if {[catch {
-	set fd [open [concat | git log --no-color -z --pretty=raw --parents \
-			  --boundary $args "--" $vfilelimit($view)] r]
+	set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
+			--parents --boundary $args "--" $vfilelimit($view)] r]
     } err]} {
 	error_popup "[mc "Error executing git log:"] $err"
 	return
@@ -11521,6 +11523,11 @@ set NS [expr {$use_ttk ? "ttk" : ""}]
 
 set git_version [join [lrange [split [lindex [exec git version] end] .] 0 2] .]
 
+set show_notes {}
+if {[package vcompare $git_version "1.6.6.2"] >= 0} {
+    set show_notes "--show-notes"
+}
+
 set runq {}
 set history {}
 set historyindex 0