gitk: Let .bleft.mid widgets 'breathe'

The widgets on top of the diff window are very tightly packed. Make
them breathe a little by adding an 'i'-spaced padding between them.

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

gitk

@@ -2361,6 +2361,9 @@ proc makewindow {} {
     ${NS}::frame .bleft.mid
     ${NS}::frame .bleft.bottom
 
+    # gap between sub-widgets
+    set wgap [font measure uifont "i"]
+
     ${NS}::button .bleft.top.search -text [mc "Search"] -command dosearch
     pack .bleft.top.search -side left -padx 5
     set sstring .bleft.top.sstring
@@ -2375,16 +2378,17 @@ proc makewindow {} {
 	-command changediffdisp -variable diffelide -value {0 1}
     ${NS}::radiobutton .bleft.mid.new -text [mc "New version"] \
 	-command changediffdisp -variable diffelide -value {1 0}
+
     ${NS}::label .bleft.mid.labeldiffcontext -text "      [mc "Lines of context"]: "
-    pack .bleft.mid.diff .bleft.mid.old .bleft.mid.new -side left
+    pack .bleft.mid.diff .bleft.mid.old .bleft.mid.new -side left -ipadx $wgap
     spinbox .bleft.mid.diffcontext -width 5 \
 	-from 0 -increment 1 -to 10000000 \
 	-validate all -validatecommand "diffcontextvalidate %P" \
 	-textvariable diffcontextstring
     .bleft.mid.diffcontext set $diffcontext
     trace add variable diffcontextstring write diffcontextchange
     lappend entries .bleft.mid.diffcontext
-    pack .bleft.mid.labeldiffcontext .bleft.mid.diffcontext -side left
+    pack .bleft.mid.labeldiffcontext .bleft.mid.diffcontext -side left -ipadx $wgap
     ${NS}::checkbutton .bleft.mid.ignspace -text [mc "Ignore space change"] \
 	-command changeignorespace -variable ignorespace
     pack .bleft.mid.ignspace -side left -padx 5