hgk: enable selected patch text on Windows

Port a patch from gitk. Original description:

On windows, mouse input follows the keyboard focus, so to allow selecting
text from the patch canvas we must not shift focus back to the top level.
This change has no negative impact on X, so we don't explicitly test
for Win32 on this change. This provides similar selection capability
as already available using X-Windows.

Signed-off-by: Mark Levedahl <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

contrib/hgk

@@ -795,8 +795,8 b' proc bindkey {ev script} {'
 # set the focus back to the toplevel for any click outside
 # the entry widgets
 proc click {w} {
-    global entries
-    foreach e $entries {
+    global ctext entries
+    foreach e [concat $entries $ctext] {
 	if {$w == $e} return
     }
     focus .
@@ -2546,6 +2546,7 b' proc selectline {l isnew} {'
 
 proc selnextline {dir} {
     global selectedline
+    focus .
     if {![info exists selectedline]} return
     set l [expr $selectedline + $dir]
     unmarkmatches
@@ -2583,6 +2584,7 b' proc addtohistory {cmd} {'
 
 proc goback {} {
     global history historyindex
+    focus .
 
     if {$historyindex > 1} {
 	incr historyindex -1
@@ -2597,6 +2599,7 b' proc goback {} {'
 
 proc goforw {} {
     global history historyindex
+    focus .
 
     if {$historyindex < [llength $history]} {
 	set cmd [lindex $history $historyindex]