git-gui: Never line wrap in file lists.

Some of my file paths in some of my repositories are very long, this
is rather typical in Java projects where the path name contains a deep
package structure and then the file name itself is rather long and
(hopefully) descriptive.  Seeing these paths line wrap in the file lists
looks absolutely horrible.  The entire rendering is almost unreadable.

Now we draw both horizontal and vertical scrollbars for both file lists,
and we never line wrap within the list text itself.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -3654,13 +3654,17 @@ label .vpane.files.index.title -text {Changes To Be Committed} \
 	-font font_ui
 text $ui_index -background white -borderwidth 0 \
 	-width 40 -height 10 \
+	-wrap none \
 	-font font_ui \
 	-cursor $cursor_ptr \
-	-yscrollcommand {.vpane.files.index.sb set} \
+	-xscrollcommand {.vpane.files.index.sx set} \
+	-yscrollcommand {.vpane.files.index.sy set} \
 	-state disabled
-scrollbar .vpane.files.index.sb -command [list $ui_index yview]
+scrollbar .vpane.files.index.sx -orient h -command [list $ui_index xview]
+scrollbar .vpane.files.index.sy -orient v -command [list $ui_index yview]
 pack .vpane.files.index.title -side top -fill x
-pack .vpane.files.index.sb -side right -fill y
+pack .vpane.files.index.sx -side bottom -fill x
+pack .vpane.files.index.sy -side right -fill y
 pack $ui_index -side left -fill both -expand 1
 .vpane.files add .vpane.files.index -sticky nsew
 
@@ -3672,13 +3676,17 @@ label .vpane.files.workdir.title -text {Changed But Not Updated} \
 	-font font_ui
 text $ui_workdir -background white -borderwidth 0 \
 	-width 40 -height 10 \
+	-wrap none \
 	-font font_ui \
 	-cursor $cursor_ptr \
-	-yscrollcommand {.vpane.files.workdir.sb set} \
+	-xscrollcommand {.vpane.files.workdir.sx set} \
+	-yscrollcommand {.vpane.files.workdir.sy set} \
 	-state disabled
-scrollbar .vpane.files.workdir.sb -command [list $ui_workdir yview]
+scrollbar .vpane.files.workdir.sx -orient h -command [list $ui_workdir xview]
+scrollbar .vpane.files.workdir.sy -orient v -command [list $ui_workdir yview]
 pack .vpane.files.workdir.title -side top -fill x
-pack .vpane.files.workdir.sb -side right -fill y
+pack .vpane.files.workdir.sx -side bottom -fill x
+pack .vpane.files.workdir.sy -side right -fill y
 pack $ui_workdir -side left -fill both -expand 1
 .vpane.files add .vpane.files.workdir -sticky nsew