git-gui: enable the Tk console when tracing/debugging on Windows

Without any standard channels the trace option is pretty useless on Win32
unless you can show the Tk console which captures such output. This also
permits introspection of the running application to assist in debugging.
Signed-off-by: NPat Thoyts <patthoyts@users.sourceforge.net>

git-gui.sh

@@ -83,6 +83,7 @@ if {![catch {set _verbose $env(GITGUI_VERBOSE)}]} {
 		puts stderr "source    $name"
 		uplevel 1 real__source $name
 	}
+	if {[tk windowingsystem] eq "win32"} { console show }
 }
 
 ######################################################################
@@ -675,6 +676,7 @@ bind . <Visibility> {
 if {[is_Windows]} {
 	wm iconbitmap . -default $oguilib/git-gui.ico
 	set ::tk::AlwaysShowSelection 1
+	bind . <Control-F2> {console show}
 
 	# Spoof an X11 display for SSH
 	if {![info exists env(DISPLAY)]} {