gitk: Add shortcut Ctrl-W for closing the active window

To make the user experience between git gui and gitk more homogeneous, use Ctrl-W in gitk too for closing the active window. When closing the main window doquit is called for proper cleanup.

---

Found myself hitting Ctrl-W in gitk with no effect once too often ;-)

 gitk-git/gitk |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

index 03dd0f4..9629394 100644
@@ -2383,6 +2383,8 @@ proc makewindow {} {
     }
     bindall <$::BM> "canvscan mark %W %x %y"
     bindall <B$::BM-Motion> "canvscan dragto %W %x %y"
+    bind all <$M1B-Key-w> {destroy [winfo toplevel %W]}
+    bind . <$M1B-Key-w> doquit
     bindkey <Home> selfirstline
     bindkey <End> sellastline
     bind . <Key-Up> "selnextline -1"

@@ -2814,6 +2816,7 @@ proc keys {} {
 [mc "Gitk key bindings:"]
 
 [mc "<%s-Q>		Quit" $M1T]
+[mc "<%s-W>		Close window" $M1T]
 [mc "<Home>		Move to first commit"]
 [mc "<End>		Move to last commit"]
 [mc "<Up>, p, i	Move up one commit"]

1.7.0.rc1.173.gc7c5.dirty

Last time I check ^w deleted the word before the cursor.

I am a man who does not exist for others.

This is sort of like when Mozilla claims Ctrl-U to show the page source, and you're expecting it to clear the line.

At least in Mozilla, you can configure the browser to respect the old meanings for Ctrl-U, etc.

- Chris