revert(3p/git): Revert merge of git upstream at v2.26.2

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232, reversing
changes made to f2b211131f.

third_party/git/gitk-git/gitk

@@ -3404,8 +3404,6 @@ set rectmask {
 }
 image create bitmap reficon-H -background black -foreground "#00ff00" \
     -data $rectdata -maskdata $rectmask
-image create bitmap reficon-R -background black -foreground "#ffddaa" \
-    -data $rectdata -maskdata $rectmask
 image create bitmap reficon-o -background black -foreground "#ddddff" \
     -data $rectdata -maskdata $rectmask
 
@@ -7018,7 +7016,6 @@ proc commit_descriptor {p} {
 
 # append some text to the ctext widget, and make any SHA1 ID
 # that we know about be a clickable link.
-# Also look for URLs of the form "http[s]://..." and make them web links.
 proc appendwithlinks {text tags} {
     global ctext linknum curview
 
@@ -7035,18 +7032,6 @@ proc appendwithlinks {text tags} {
 	setlink $linkid link$linknum
 	incr linknum
     }
-    set wlinks [regexp -indices -all -inline -line \
-		    {https?://[^[:space:]]+} $text]
-    foreach l $wlinks {
-	set s2 [lindex $l 0]
-	set e2 [lindex $l 1]
-	set url [string range $text $s2 $e2]
-	incr e2
-	$ctext tag delete link$linknum
-	$ctext tag add link$linknum "$start + $s2 c" "$start + $e2 c"
-	setwlink $url link$linknum
-	incr linknum
-    }
 }
 
 proc setlink {id lk} {
@@ -7079,18 +7064,6 @@ proc setlink {id lk} {
     }
 }
 
-proc setwlink {url lk} {
-    global ctext
-    global linkfgcolor
-    global web_browser
-
-    if {$web_browser eq {}} return
-    $ctext tag conf $lk -foreground $linkfgcolor -underline 1
-    $ctext tag bind $lk <1> [list browseweb $url]
-    $ctext tag bind $lk <Enter> {linkcursor %W 1}
-    $ctext tag bind $lk <Leave> {linkcursor %W -1}
-}
-
 proc appendshortlink {id {pre {}} {post {}}} {
     global ctext linknum
 
@@ -7125,16 +7098,6 @@ proc linkcursor {w inc} {
     }
 }
 
-proc browseweb {url} {
-    global web_browser
-
-    if {$web_browser eq {}} return
-    # Use eval here in case $web_browser is a command plus some arguments
-    if {[catch {eval exec $web_browser [list $url] &} err]} {
-	error_popup "[mc "Error starting web browser:"] $err"
-    }
-}
-
 proc viewnextline {dir} {
     global canv linespc
 
@@ -8228,11 +8191,11 @@ proc parseblobdiffline {ids line} {
 	} else {
 	    $ctext insert end "$line\n" filesep
 	}
-    } elseif {$currdiffsubmod != "" && ![string compare -length 3 "  >" $line]} {
+    } elseif {![string compare -length 3 "  >" $line]} {
 	set $currdiffsubmod ""
 	set line [encoding convertfrom $diffencoding $line]
 	$ctext insert end "$line\n" dresult
-    } elseif {$currdiffsubmod != "" && ![string compare -length 3 "  <" $line]} {
+    } elseif {![string compare -length 3 "  <" $line]} {
 	set $currdiffsubmod ""
 	set line [encoding convertfrom $diffencoding $line]
 	$ctext insert end "$line\n" d0
@@ -10059,7 +10022,6 @@ proc sel_reflist {w x y} {
     set n [lindex $ref 0]
     switch -- [lindex $ref 1] {
 	"H" {selbyid $headids($n)}
-	"R" {selbyid $headids($n)}
 	"T" {selbyid $tagids($n)}
 	"o" {selbyid $otherrefids($n)}
     }
@@ -10089,11 +10051,7 @@ proc refill_reflist {} {
     foreach n [array names headids] {
 	if {[string match $reflistfilter $n]} {
 	    if {[commitinview $headids($n) $curview]} {
-		if {[string match "remotes/*" $n]} {
-		    lappend refs [list $n R]
-		} else {
-		    lappend refs [list $n H]
-		}
+		lappend refs [list $n H]
 	    } else {
 		interestedin $headids($n) {run refill_reflist}
 	    }
@@ -11530,7 +11488,7 @@ proc create_prefs_page {w} {
 proc prefspage_general {notebook} {
     global NS maxwidth maxgraphpct showneartags showlocalchanges
     global tabstop limitdiffs autoselect autosellen extdifftool perfile_attrs
-    global hideremotes want_ttk have_ttk maxrefs web_browser
+    global hideremotes want_ttk have_ttk maxrefs
 
     set page [create_prefs_page $notebook.general]
 
@@ -11581,13 +11539,6 @@ proc prefspage_general {notebook} {
     pack configure $page.extdifff.l -padx 10
     grid x $page.extdifff $page.extdifft -sticky ew
 
-    ${NS}::entry $page.webbrowser -textvariable web_browser
-    ${NS}::frame $page.webbrowserf
-    ${NS}::label $page.webbrowserf.l -text [mc "Web browser" ]
-    pack $page.webbrowserf.l -side left
-    pack configure $page.webbrowserf.l -padx 10
-    grid x $page.webbrowserf $page.webbrowser -sticky ew
-
     ${NS}::label $page.lgen -text [mc "General options"]
     grid $page.lgen - -sticky w -pady 10
     ${NS}::checkbutton $page.want_ttk -variable want_ttk \
@@ -12359,7 +12310,6 @@ if {[tk windowingsystem] eq "win32"} {
     set bgcolor SystemWindow
     set fgcolor SystemWindowText
     set selectbgcolor SystemHighlight
-    set web_browser "cmd /c start"
 } else {
     set uicolor grey85
     set uifgcolor black
@@ -12367,11 +12317,6 @@ if {[tk windowingsystem] eq "win32"} {
     set bgcolor white
     set fgcolor black
     set selectbgcolor gray85
-    if {[tk windowingsystem] eq "aqua"} {
-	set web_browser "open"
-    } else {
-	set web_browser "xdg-open"
-    }
 }
 set diffcolors {red "#00a000" blue}
 set diffcontext 3
@@ -12445,7 +12390,6 @@ set config_variables {
     filesepbgcolor filesepfgcolor linehoverbgcolor linehoverfgcolor
     linehoveroutlinecolor mainheadcirclecolor workingfilescirclecolor
     indexcirclecolor circlecolors linkfgcolor circleoutlinecolor
-    web_browser
 }
 foreach var $config_variables {
     config_init_trace $var