git-gui: remove unreachable Tk 8.4 code

git-gui has remnant code to allow some drawing with Tk 8.4 predating the
addition of themed widgets. As git-gui requires Tk >= 8.6, this code can
never trigger. Remove it.

Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>

git-gui.sh

@@ -1268,8 +1268,6 @@ citool {
 ##
 ## execution environment
 
-set have_tk85 [expr {[package vcompare $tk_version "8.5"] >= 0}]
-
 # Suggest our implementation of askpass, if none is set
 if {![info exists env(SSH_ASKPASS)]} {
 	set env(SSH_ASKPASS) [gitexec git-gui--askpass]
@@ -3363,28 +3361,18 @@ unset i
 
 # -- Diff and Commit Area
 #
-if {$have_tk85} {
-	${NS}::panedwindow .vpane.lower -orient vertical
-	${NS}::frame .vpane.lower.commarea
-	${NS}::frame .vpane.lower.diff -relief sunken -borderwidth 1 -height 500
-	.vpane.lower add .vpane.lower.diff
-	.vpane.lower add .vpane.lower.commarea
-	.vpane add .vpane.lower
-	if {$use_ttk} {
-		.vpane.lower pane .vpane.lower.diff -weight 1
-		.vpane.lower pane .vpane.lower.commarea -weight 0
-	} else {
-		.vpane.lower paneconfigure .vpane.lower.diff -stretch always
-		.vpane.lower paneconfigure .vpane.lower.commarea -stretch never
-	}
+${NS}::panedwindow .vpane.lower -orient vertical
+${NS}::frame .vpane.lower.commarea
+${NS}::frame .vpane.lower.diff -relief sunken -borderwidth 1 -height 500
+.vpane.lower add .vpane.lower.diff
+.vpane.lower add .vpane.lower.commarea
+.vpane add .vpane.lower
+if {$use_ttk} {
+	.vpane.lower pane .vpane.lower.diff -weight 1
+	.vpane.lower pane .vpane.lower.commarea -weight 0
 } else {
-	frame .vpane.lower -height 300 -width 400
-	frame .vpane.lower.commarea
-	frame .vpane.lower.diff -relief sunken -borderwidth 1
-	pack .vpane.lower.diff -fill both -expand 1
-	pack .vpane.lower.commarea -side bottom -fill x
-	.vpane add .vpane.lower
-	.vpane paneconfigure .vpane.lower -sticky nsew
+	.vpane.lower paneconfigure .vpane.lower.diff -stretch always
+	.vpane.lower paneconfigure .vpane.lower.commarea -stretch never
 }
 
 # -- Commit Area Buttons

lib/blame.tcl

@@ -63,7 +63,7 @@ field tooltip_timer     {} ; # Current timer event for our tooltip
 field tooltip_commit    {} ; # Commit(s) in tooltip
 
 constructor new {i_commit i_path i_jump} {
-	global cursor_ptr M1B M1T have_tk85 use_ttk NS
+	global cursor_ptr M1B M1T NS
 	variable active_color
 	variable group_colors
 
@@ -203,9 +203,8 @@ constructor new {i_commit i_path i_jump} {
 		-width 80 \
 		-xscrollcommand [list $w.file_pane.out.sbx set] \
 		-font font_diff
-	if {$have_tk85} {
 		$w_file configure -inactiveselectbackground darkblue
-	}
+
 	$w_file tag conf found \
 		-background yellow
 
@@ -1298,7 +1297,7 @@ method _open_tooltip {cur_w} {
 	# On MacOS raising a window causes it to acquire focus.
 	# Tk 8.5 on MacOS seems to properly support wm transient,
 	# so we can safely counter the effect there.
-	if {$::have_tk85 && [is_MacOSX]} {
+	if {[is_MacOSX]} {
 		update
 		if {$w eq {}} {
 			raise .

lib/diff.tcl

@@ -2,15 +2,13 @@
 # Copyright (C) 2006, 2007 Shawn Pearce
 
 proc apply_tab_size {{firsttab {}}} {
-	global have_tk85 repo_config ui_diff
+	global repo_config ui_diff
 
 	set w [font measure font_diff "0"]
-	if {$have_tk85 && $firsttab != 0} {
+	if {$firsttab != 0} {
 		$ui_diff configure -tabs [list [expr {$firsttab * $w}] [expr {($firsttab + $repo_config(gui.tabsize)) * $w}]]
-	} elseif {$have_tk85 || $repo_config(gui.tabsize) != 8} {
-		$ui_diff configure -tabs [expr {$repo_config(gui.tabsize) * $w}]
 	} else {
-		$ui_diff configure -tabs {}
+		$ui_diff configure -tabs [expr {$repo_config(gui.tabsize) * $w}]
 	}
 }
 

lib/sshkey.tcl

@@ -18,7 +18,7 @@ proc find_ssh_key {} {
 }
 
 proc do_ssh_key {} {
-	global sshkey_title have_tk85 sshkey_fd use_ttk NS
+	global sshkey_title sshkey_fd use_ttk NS
 
 	set w .sshkey_dialog
 	if {[winfo exists $w]} {
@@ -48,11 +48,9 @@ proc do_ssh_key {} {
 
 	text $w.contents -width 60 -height 10 -wrap char -relief sunken
 	pack $w.contents -fill both -expand 1
-	if {$have_tk85} {
-		set clr darkblue
-		if {$use_ttk} { set clr [ttk::style lookup . -selectbackground] }
-		$w.contents configure -inactiveselectbackground $clr
-	}
+	set clr darkblue
+	if {$use_ttk} { set clr [ttk::style lookup . -selectbackground] }
+	$w.contents configure -inactiveselectbackground $clr
 
 	${NS}::frame $w.buttons
 	${NS}::button $w.buttons.close -text [mc Close] \