On Mac, the back and forward buttons show an empty rectange instead of
a grayed-out arrow when they are disabled. The reason is a Tk bug on Mac
that causes disabled images not to draw correctly (not to draw at all,
that is); see

To work around this, we explicitly provide gray images for the disabled
state; I think this looks better than the default stipple effect that you
get on Windows as well, but that may be a matter of taste.

Signed-off-by: Stefan Haller <ste...@haller-berlin.de>
 gitk | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/gitk b/gitk
index d93bd99..e7723db 100755
--- a/gitk
+++ b/gitk
@@ -2161,7 +2161,7 @@ proc makewindow {} {
     trace add variable sha1string write sha1change
     pack $sha1entry -side left -pady 2
-    image create bitmap bm-left -data {
+    set bm_left_data {
        #define left_width 16
        #define left_height 16
        static unsigned char left_bits[] = {
@@ -2169,7 +2169,7 @@ proc makewindow {} {
        0x0e, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x0e, 0x00, 0x1c, 0x00,
        0x38, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xc0, 0x01};
-    image create bitmap bm-right -data {
+    set bm_right_data {
        #define right_width 16
        #define right_height 16
        static unsigned char right_bits[] = {
@@ -2177,11 +2177,16 @@ proc makewindow {} {
        0x00, 0x38, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x38, 0x00, 0x1c,
        0x00, 0x0e, 0x00, 0x07, 0x80, 0x03, 0xc0, 0x01};
-    ${NS}::button .tf.bar.leftbut -image bm-left -command goback \
-       -state disabled -width 26
+    image create bitmap bm-left -data $bm_left_data
+    image create bitmap bm-left-gray -data $bm_left_data -foreground "#999"
+    image create bitmap bm-right -data $bm_right_data
+    image create bitmap bm-right-gray -data $bm_right_data -foreground "#999"
+    ${NS}::button .tf.bar.leftbut -image [list bm-left disabled bm-left-gray] \
+       -command goback -state disabled -width 26
     pack .tf.bar.leftbut -side left -fill y
-    ${NS}::button .tf.bar.rightbut -image bm-right -command goforw \
-       -state disabled -width 26
+    ${NS}::button .tf.bar.rightbut -image [list bm-right disabled 
bm-right-gray] \
+       -command goforw -state disabled -width 26
     pack .tf.bar.rightbut -side left -fill y
     ${NS}::label .tf.bar.rowlabel -text [mc "Row"]

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