[PATCH] gitk: Enable mouse horizontal scrolling in diff pane

[Gabriele Mazzotta <gabriele.mzt@gmail.com>]

Currently it's required to hold Shift and scroll up and down to move
horizontally. Listen to Button-6 and Button-7 events too to make
horizontal scrolling handier with touchpads and some mice.

Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
---
 gitk-git/gitk | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gitk-git/gitk b/gitk-git/gitk
index 78358a7..95a98e3 100755
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -2516,6 +2516,13 @@ proc makewindow {} {
     } else {
 	bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
 	bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
+        bind $ctext <Button> {
+            if {"%b" eq 6} {
+                $ctext xview scroll -5 units
+            } elseif {"%b" eq 7} {
+                $ctext xview scroll 5 units
+            }
+        }
         if {[tk windowingsystem] eq "aqua"} {
             bindall <MouseWheel> {
                 set delta [expr {- (%D)}]
-- 
2.1.3