gitk: make configuration dialog resizing useful

gitk's configuration dialog can be resized, but this does not expand the
space allocated to any widgets. Some items may have long lines of text
that would be visible if the widgets expanded, but this does not happen.

The top-level container uses a two column grid and allocates any space
change equally to both columns.  However, the configuration pages are
contained in one cell so half the additional space is wasted if
expanding. Also, the individual configuration pages do not mark any
column or widgets to expand, so any additional space given is just used
as padding.

Collapse the top-level page to have one column, placing the "OK" and
"Cancel" buttons in a non-resizing frame in column 1 (this keeps the
buttons in constant geometry as the dialog is expanded). This makes all
additional space go to the configuration page.

Mark column 3 of the individual pages to get all additional space, and
mark the text widgets in that column so they will expand to use the
space. While we're at it, eliminate or simplify use of frames to contain
column 2 content, and harmonize the indents of that content.

prefspage_general adds a special "spacer" label in row 2, column 1, that
causes all of the subsequent rows with no column 1 content to indent,
and this carries over to the next notebook tab (prefspage_color) through
some undocumented feature. The fonts page has a different indent, again
for unknown reason. The documented approach would be to use -padx
explicitly on all the rows to set the indents.

Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>

gitk

@@ -11567,9 +11567,10 @@ proc mkfontdisp {font top which} {
     set fontpref($font) [set $font]
     ttk::button $top.${font}but -text $which \
         -command [list choosefont $font $which]
-    ttk::label $top.$font -relief flat -font $font \
-        -text $fontattr($font,family) -justify left
+    ttk::label $top.$font -font $font \
+        -text $fontattr($font,family)
     grid x $top.${font}but $top.$font -sticky w
+    grid configure $top.$font -sticky ew
 }
 
 proc centertext {w} {
@@ -11665,11 +11666,9 @@ proc prefspage_general {notebook} {
     grid x $page.hideremotes -sticky w
 
     ttk::entry $page.refstohide -textvariable refstohide
-    ttk::frame $page.refstohidef
-    ttk::label $page.refstohidef.l -text [mc "Refs to hide (space-separated globs)" ]
-    pack $page.refstohidef.l -side left
-    pack configure $page.refstohidef.l -padx 10
-    grid x $page.refstohidef $page.refstohide -sticky ew
+    ttk::label $page.refstohidel -text [mc "Refs to hide (space-separated globs)"]
+    grid x $page.refstohidel $page.refstohide -sticky ew
+    grid configure $page.refstohide -padx {0 5}
 
     ttk::checkbutton $page.autocopy -text [mc "Copy commit ID to clipboard"] \
         -variable autocopy
@@ -11718,16 +11717,17 @@ proc prefspage_general {notebook} {
     ttk::frame $page.extdifff
     ttk::label $page.extdifff.l -text [mc "External diff tool" ]
     ttk::button $page.extdifff.b -text [mc "Choose..."] -command choose_extdiff
-    pack $page.extdifff.l $page.extdifff.b -side left
-    pack configure $page.extdifff.l -padx 10
+    pack $page.extdifff.l -side left
+    pack $page.extdifff.b -side right -padx {0 5}
     grid x $page.extdifff $page.extdifft -sticky ew
+    grid configure $page.extdifft -padx {0 5}
 
     ttk::entry $page.webbrowser -textvariable web_browser
-    ttk::frame $page.webbrowserf
-    ttk::label $page.webbrowserf.l -text [mc "Web browser" ]
-    pack $page.webbrowserf.l -side left
-    pack configure $page.webbrowserf.l -padx 10
-    grid x $page.webbrowserf $page.webbrowser -sticky ew
+    ttk::label $page.webbrowserl -text [mc "Web browser" ]
+    grid x $page.webbrowserl $page.webbrowser -sticky ew
+    grid configure $page.webbrowser -padx {0 5}
+
+    grid columnconfigure $page 2 -weight 1
 
     return $page
 }
@@ -11751,9 +11751,11 @@ proc prefspage_colors {notebook} {
     ttk::label $page.tloadframe.l -text [mc "Theme definition file"]
     ttk::button $page.tloadframe.b -text [mc "Choose..."] \
         -command [list choose_themeloader $page]
-    pack $page.tloadframe.l $page.tloadframe.b -side left -padx 2
+    pack $page.tloadframe.l -side left
+    pack $page.tloadframe.b -side right -padx {0 5}
     pack configure $page.tloadframe.l -padx 0
     grid x $page.tloadframe $page.tloadvar -sticky ew
+    grid configure $page.tloadvar -padx {0 5}
 
     ttk::label $page.themelabel2 -text \
         [mc "The theme definition file may affect all themes."]
@@ -11799,6 +11801,9 @@ proc prefspage_colors {notebook} {
     ttk::button $page.selbgbut -text [mc "Select bg"] \
         -command [list choosecolor selectbgcolor {} $page [mc "background"]]
     grid x $page.selbgbut $page.selbgsep -sticky w
+
+    grid columnconfigure $page 2 -weight 1
+
     return $page
 }
 
@@ -11824,6 +11829,7 @@ proc prefspage_fonts {notebook} {
     mkfontdisp mainfont $page [mc "Main font"]
     mkfontdisp textfont $page [mc "Diff display font"]
     mkfontdisp uifont $page [mc "User interface font"]
+    grid columnconfigure $page 2 -weight 1
     return $page
 }
 
@@ -11858,7 +11864,7 @@ proc doprefs {} {
     grid rowconfigure $notebook 1 -weight 1
     raise [lindex $pages 0]
 
-    grid $notebook -sticky news -padx 2 -pady 2
+    grid $notebook -sticky news -padx 3 -pady 3
     grid rowconfigure $top 0 -weight 1
     grid columnconfigure $top 0 -weight 1
 
@@ -11867,11 +11873,8 @@ proc doprefs {} {
     ttk::button $top.buts.can -text [mc "Cancel"] -command prefscan -default normal
     bind $top <Key-Return> prefsok
     bind $top <Key-Escape> prefscan
-    grid $top.buts.ok $top.buts.can
-    grid columnconfigure $top.buts 0 -weight 1 -uniform a
-    grid columnconfigure $top.buts 1 -weight 1 -uniform a
-    grid $top.buts - - -pady 10 -sticky ew
-    grid columnconfigure $top 2 -weight 1
+    grid $top.buts.ok $top.buts.can -padx 20
+    grid $top.buts -sticky w -pady 10
     bind $top <Visibility> [list focus $top.buts.ok]
 }