git-gui: Only allow Refresh in diff context menu when we have a diff.

diff --git a/git-gui.sh b/git-gui.sh
index 79f980c470707ca74c95503df9c334541c66200e..b9e3d563e2bef9eb642aa0e3e8fc2b9892b3873a 100755 (executable)
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -4261,6 +4261,7 @@ $ctxm add command \
        -label {Refresh} \
        -font font_ui \
        -command reshow_diff
+lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
 $ctxm add command \
        -label {Copy} \
        -font font_ui \