git-gui: use themed tk widgets with Tk 8.5

This patch enables the use of themed Tk widgets with Tk 8.5 and above.
These make a significant difference on Windows in making the
application appear native. On Windows and MacOSX ttk defaults to the
native look as much as possible. On X11 the user may select a theme
using the TkTheme XRDB resource class by adding an line to the
.Xresources file. The set of installed theme names is available using
the Tk command 'ttk::themes'. The default on X11 is similar to the current
un-themed style - a kind of thin bordered motif look.

A new git config variable 'gui.usettk' may be set to disable this if
the user prefers the classic Tk look. Using Tk 8.4 will also avoid the
use of themed widgets as these are only available since 8.5.

Some support is included for Tk 8.6 features (themed spinbox and native
font chooser for MacOSX and Windows).

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

lib/index.tcl

@@ -8,26 +8,28 @@ proc _delete_indexlock {} {
 }
 
 proc _close_updateindex {fd after} {
+	global use_ttk NS
 	fconfigure $fd -blocking 1
 	if {[catch {close $fd} err]} {
 		set w .indexfried
-		toplevel $w
+		Dialog $w
+		wm withdraw $w
 		wm title $w [strcat "[appname] ([reponame]): " [mc "Index Error"]]
 		wm geometry $w "+[winfo rootx .]+[winfo rooty .]"
 		set s [mc "Updating the Git index failed.  A rescan will be automatically started to resynchronize git-gui."]
 		text $w.msg -yscrollcommand [list $w.vs set] \
 			-width [string length $s] -relief flat \
 			-borderwidth 0 -highlightthickness 0 \
-			-background [$w cget -background]
+			-background [get_bg_color $w]
 		$w.msg tag configure bold -font font_uibold -justify center
-		scrollbar $w.vs -command [list $w.msg yview]
+		${NS}::scrollbar $w.vs -command [list $w.msg yview]
 		$w.msg insert end $s bold \n\n$err {}
 		$w.msg configure -state disabled
 
-		button $w.continue \
+		${NS}::button $w.continue \
 			-text [mc "Continue"] \
 			-command [list destroy $w]
-		button $w.unlock \
+		${NS}::button $w.unlock \
 			-text [mc "Unlock Index"] \
 			-command "destroy $w; _delete_indexlock"
 		grid $w.msg - $w.vs -sticky news
@@ -40,6 +42,7 @@ proc _close_updateindex {fd after} {
 			grab $w
 			focus %W
 		"
+		wm deiconify $w
 		tkwait window $w
 
 		$::main_status stop