gitk: Integrate the reset progress bar in the main frame

This makes the reset function use a progress bar in the same location
as the progress bars for reading in commits and for finding commits,
instead of a progress bar in a separate detached window.  The progress
bar for resetting is red.

This also puts "Resetting" in the status window while the reset is in
progress.  The setting of the status window is done through an
extension of the interface used for setting the watch cursor.
Signed-off-by: NPaul Mackerras <paulus@samba.org>

gitk

@@ -626,6 +626,7 @@ proc makewindow {} {
     global bgcolor fgcolor bglist fglist diffcolors selectbgcolor
     global headctxmenu progresscanv progressitem progresscoords statusw
     global fprogitem fprogcoord lastprogupdate progupdatepending
+    global rprogitem rprogcoord
     global have_tk85
 
     menu .bar
@@ -752,9 +753,11 @@ proc makewindow {} {
     canvas $progresscanv -relief sunken -height $h -borderwidth 2
     set progressitem [$progresscanv create rect -1 0 0 $h -fill green]
     set fprogitem [$progresscanv create rect -1 0 0 $h -fill yellow]
+    set rprogitem [$progresscanv create rect -1 0 0 $h -fill red]
     pack $progresscanv -side right -expand 1 -fill x
     set progresscoords {0 0}
     set fprogcoord 0
+    set rprogcoord 0
     bind $progresscanv <Configure> adjustprogress
     set lastprogupdate [clock clicks -milliseconds]
     set progupdatepending 0
@@ -1110,6 +1113,7 @@ proc click {w} {
 proc adjustprogress {} {
     global progresscanv progressitem progresscoords
     global fprogitem fprogcoord lastprogupdate progupdatepending
+    global rprogitem rprogcoord
 
     set w [expr {[winfo width $progresscanv] - 4}]
     set x0 [expr {$w * [lindex $progresscoords 0]}]
@@ -1117,6 +1121,7 @@ proc adjustprogress {} {
     set h [winfo height $progresscanv]
     $progresscanv coords $progressitem $x0 0 $x1 $h
     $progresscanv coords $fprogitem 0 0 [expr {$w * $fprogcoord}] $h
+    $progresscanv coords $rprogitem 0 0 [expr {$w * $rprogcoord}] $h
     set now [clock clicks -milliseconds]
     if {$now >= $lastprogupdate + 100} {
 	set progupdatepending 0
@@ -4195,20 +4200,30 @@ proc settextcursor {c} {
     set curtextcursor $c
 }
 
-proc nowbusy {what} {
-    global isbusy
+proc nowbusy {what {name {}}} {
+    global isbusy busyname statusw
 
     if {[array names isbusy] eq {}} {
 	. config -cursor watch
 	settextcursor watch
     }
     set isbusy($what) 1
+    set busyname($what) $name
+    if {$name ne {}} {
+	$statusw conf -text $name
+    }
 }
 
 proc notbusy {what} {
-    global isbusy maincursor textcursor
+    global isbusy maincursor textcursor busyname statusw
 
-    catch {unset isbusy($what)}
+    catch {
+	unset isbusy($what)
+	if {$busyname($what) ne {} &&
+	    [$statusw cget -text] eq $busyname($what)} {
+	    $statusw conf -text {}
+	}
+    }
     if {[array names isbusy] eq {}} {
 	. config -cursor $maincursor
 	settextcursor $textcursor
@@ -6432,32 +6447,23 @@ proc resethead {} {
 	error_popup $err
     } else {
 	dohidelocalchanges
-	set w ".resetprogress"
-	filerun $fd [list readresetstat $fd $w]
-	toplevel $w
-	wm transient $w
-	wm title $w "Reset progress"
-	message $w.m -text "Reset in progress, please wait..." \
-	    -justify center -aspect 1000
-	pack $w.m -side top -fill x -padx 20 -pady 5
-	canvas $w.c -width 150 -height 20 -bg white
-	$w.c create rect 0 0 0 20 -fill green -tags rect
-	pack $w.c -side top -fill x -padx 20 -pady 5 -expand 1
-	nowbusy reset
+	filerun $fd [list readresetstat $fd]
+	nowbusy reset "Resetting"
     }
 }
 
-proc readresetstat {fd w} {
-    global mainhead mainheadid showlocalchanges
+proc readresetstat {fd} {
+    global mainhead mainheadid showlocalchanges rprogcoord
 
     if {[gets $fd line] >= 0} {
 	if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
-	    set x [expr {($m * 150) / $n}]
-	    $w.c coords rect 0 0 $x 20
+	    set rprogcoord [expr {1.0 * $m / $n}]
+	    adjustprogress
 	}
 	return 1
     }
-    destroy $w
+    set rprogcoord 0
+    adjustprogress
     notbusy reset
     if {[catch {close $fd} err]} {
 	error_popup $err