gitk: synchronize highlighting in file view for 'f'&'b' commands

["Eric Raible" <raible@gmail.com>]

Previously, 'b', backspace, and delete all did the same thing.
This changes 'b' to perform the inverse of 'f'.  And both of
them now highlight the filename of the currently diff.

This makes it easier to review and navigate the diffs associated
with a particular commit using only f, b, and space because the
filename of the currently display diff will be dynamically
highlighted.

Signed-off-by: Eric Raible <raible@gmail.com>
---
 gitk-git/gitk |   24 ++++++++++++++++++++----
 1 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/gitk-git/gitk b/gitk-git/gitk
index 84ab02e..51ba3ff 100644
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -1016,7 +1016,7 @@ proc makewindow {} {
     bindkey k "selnextline 1"
     bindkey j "goback"
     bindkey l "goforw"
-    bindkey b "$ctext yview scroll -1 pages"
+    bindkey b prevfile
     bindkey d "$ctext yview scroll 18 units"
     bindkey u "$ctext yview scroll -18 units"
     bindkey / {dofind 1 1}
@@ -5478,18 +5478,34 @@ proc changediffdisp {} {
     $ctext tag conf d1 -elide [lindex $diffelide 1]
 }

+proc highlightfile {loc} {
+    global ctext
+    $ctext yview $loc
+
+    global cmitmode ctext cflist cflist_top
+    if {$cmitmode eq "tree"} return
+
+    $cflist tag remove highlight $cflist_top.0 "$cflist_top.0 lineend"
+
+    set file [regsub -- "-* (.*?) -*" [$ctext get $loc "$loc lineend"] "\\1"]
+    set cline [$cflist search -regexp [subst {^$file$}] 0.0]
+
+    $cflist tag add highlight $cline "$cline lineend"
+    $cflist see $cline
+    set cflist_top [lindex [split $cline .] 0]
+}
+
 proc prevfile {} {
     global difffilestart ctext
     set prev [lindex $difffilestart 0]
     set here [$ctext index @0,0]
     foreach loc $difffilestart {
        if {[$ctext compare $loc >= $here]} {
-           $ctext yview $prev
+           highlightfile $prev
            return
        }
        set prev $loc
     }
-    $ctext yview $prev
 }

 proc nextfile {} {
@@ -5497,7 +5513,7 @@ proc nextfile {} {
     set here [$ctext index @0,0]
     foreach loc $difffilestart {
        if {[$ctext compare $loc > $here]} {
-           $ctext yview $loc
+           highlightfile $loc
            return
        }
     }
--
1.5.4.2.1161.g1a6f0