gitk: Fix bugs in setting rowfinal

We weren't updating the rowfinal list in insertrow and removerow, so
it was getting out of sync with rowidlist, which resulted in Tcl errors.
This also optimizes the setting of rowfinal in layoutrows a bit.
Signed-off-by: NPaul Mackerras <paulus@samba.org>

gitk

@@ -3008,20 +3008,21 @@ proc layoutrows {row endrow} {
 
     set idlist {}
     if {$row > 0} {
-	foreach id [lindex $rowidlist [expr {$row - 1}]] {
+	set rm1 [expr {$row - 1}]
+	foreach id [lindex $rowidlist $rm1] {
 	    if {$id ne {}} {
 		lappend idlist $id
 	    }
 	}
+	set final [lindex $rowfinal $rm1]
     }
     for {} {$row < $endrow} {incr row} {
 	set rm1 [expr {$row - 1}]
-	if {$rm1 < 0 || [lindex $rowidlist $rm1] eq {}} {
+	if {$rm1 < 0 || $idlist eq {}} {
 	    set idlist [make_idlist $row]
 	    set final 1
 	} else {
 	    set id [lindex $displayorder $rm1]
-	    set final [lindex $rowfinal $rm1]
 	    set col [lsearch -exact $idlist $id]
 	    set idlist [lreplace $idlist $col $col]
 	    foreach p [lindex $parentlist $rm1] {
@@ -3090,9 +3091,9 @@ proc layoutrows {row endrow} {
 	} elseif {$row < $l} {
 	    if {![rowsequal $idlist [lindex $rowidlist $row]]} {
 		lset rowidlist $row $idlist
-		lset rowfinal $row $final
 		changedrow $row
 	    }
+	    lset rowfinal $row $final
 	} else {
 	    set pad [ntimes [expr {$row - $l}] {}]
 	    set rowidlist [concat $rowidlist $pad]
@@ -4055,7 +4056,7 @@ proc show_status {msg} {
 # on that row and below will move down one row.
 proc insertrow {row newcmit} {
     global displayorder parentlist commitlisted children
-    global commitrow curview rowidlist rowisopt numcommits
+    global commitrow curview rowidlist rowisopt rowfinal numcommits
     global numcommits
     global selectedline commitidx ordertok
 
@@ -4089,6 +4090,7 @@ proc insertrow {row newcmit} {
     }
     set rowidlist [linsert $rowidlist $row $idlist]
     set rowisopt [linsert $rowisopt $row 0]
+    set rowfinal [linsert $rowfinal $row [lindex $rowfinal $row]]
 
     incr numcommits
 
@@ -4101,7 +4103,7 @@ proc insertrow {row newcmit} {
 # Remove a commit that was inserted with insertrow on row $row.
 proc removerow {row} {
     global displayorder parentlist commitlisted children
-    global commitrow curview rowidlist rowisopt numcommits
+    global commitrow curview rowidlist rowisopt rowfinal numcommits
     global numcommits
     global linesegends selectedline commitidx
 
@@ -4130,6 +4132,7 @@ proc removerow {row} {
 
     set rowidlist [lreplace $rowidlist $row $row]
     set rowisopt [lreplace $rowisopt $row $row]
+    set rowfinal [lreplace $rowfinal $row $row]
 
     incr numcommits -1