gitk: Make downward-pointing arrows end in vertical line segment

It seems Tk 8.4 can't draw arrows on diagonal line segments.  This
adds code to the optimizer to make the last bit of a line go vertically
before being terminated with an arrow pointing downwards, so that
it will be drawn correctly by Tk 8.4.

Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/gitk b/gitk
index 34f55bc..69d67ee 100755 (executable)
--- a/gitk
+++ b/gitk
@@ -952,8 +952,9 @@ proc layoutrows {row endrow last} {
                        set offs [lreplace $offs $x $x]
                        set offs [incrange $offs $x 1]
                        set idinlist($i) 0
-                       lappend linesegends($row) $i
-                       lappend idrowranges($i) [expr {$row-1}]
+                       set rm1 [expr {$row - 1}]
+                       lappend linesegends($rm1) $i
+                       lappend idrowranges($i) $rm1
                        if {[incr nev -1] <= 0} break
                        continue
                    }
@@ -982,7 +983,6 @@ proc layoutrows {row endrow last} {
            unset idinlist($id)
        }
        if {[info exists idrowranges($id)]} {
-           lappend linesegends($row) $id
            lappend idrowranges($id) $row
        }
        incr row
@@ -1038,7 +1038,7 @@ proc addextraid {id row} {
 
 proc layouttail {} {
     global rowidlist rowoffsets idinlist commitidx
-    global idrowranges linesegends
+    global idrowranges
 
     set row $commitidx
     set idlist [lindex $rowidlist $row]
@@ -1047,7 +1047,6 @@ proc layouttail {} {
        set id [lindex $idlist $col]
        addextraid $id $row
        unset idinlist($id)
-       lappend linesegends($row) $id
        lappend idrowranges($id) $row
        incr row
        set offs [ntimes $col 0]
@@ -1061,7 +1060,6 @@ proc layouttail {} {
        lset rowidlist $row [list $id]
        lset rowoffsets $row 0
        makeuparrow $id 0 $row 0
-       lappend linesegends($row) $id
        lappend idrowranges($id) $row
        incr row
        lappend rowidlist {}
@@ -1079,12 +1077,23 @@ proc insert_pad {row col npad} {
 }
 
 proc optimize_rows {row col endrow} {
-    global rowidlist rowoffsets idrowranges
+    global rowidlist rowoffsets idrowranges linesegends displayorder
 
     for {} {$row < $endrow} {incr row} {
        set idlist [lindex $rowidlist $row]
        set offs [lindex $rowoffsets $row]
        set haspad 0
+       set downarrowcols {}
+       if {[info exists linesegends($row)]} {
+           set downarrowcols $linesegends($row)
+           if {$col > 0} {
+               while {$downarrowcols ne {}} {
+                   set i [lsearch -exact $idlist [lindex $downarrowcols 0]]
+                   if {$i < 0 || $i >= $col} break
+                   set downarrowcols [lrange $downarrowcols 1 end]
+               }
+           }
+       }
        for {} {$col < [llength $offs]} {incr col} {
            if {[lindex $idlist $col] eq {}} {
                set haspad 1
@@ -1102,6 +1111,10 @@ proc optimize_rows {row col endrow} {
                    $y0 > [lindex $idrowranges($id) 0]} {
                    set isarrow 1
                }
+           } elseif {$downarrowcols ne {} &&
+                     [lindex $idlist $col] eq [lindex $downarrowcols 0]} {
+               set downarrowcols [lrange $downarrowcols 1 end]
+               set isarrow 1
            }
            if {$z < -1 || ($z < 0 && $isarrow)} {
                set npad [expr {-1 - $z + $isarrow}]
@@ -1660,7 +1673,7 @@ proc drawrest {} {
     showstuff $commitidx
 
     set drawmsecs [expr {[clock clicks -milliseconds] - $startmsecs}]
-    puts "overall $drawmsecs ms for $numcommits commits"
+    #puts "overall $drawmsecs ms for $numcommits commits"
 }
 
 proc findmatches {f} {