git-gui: Use a grid layout for the blame viewer.

Using a panedwindow to display the blame viewer's individual columns
just doesn't make sense.  Most of the important data fits within the
columns we have allocated, and those that don't the leading part fits
and that's good enough.  There are just too many columns within this
viewer to let the user sanely control individual column widths.  This
change shouldn't really be an issue for most git-gui users as their
displays should be large enough to accept this massive dump of data.

We now also have a properly working horizontal scrollbar for the
current file data area.  This makes it easier to get away with a
narrow window when screen space is limited, as you can still scroll
around within the file content.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -3153,7 +3153,6 @@ proc show_blame {commit path} {
 	set texts [list]
 
 	toplevel $w
-	panedwindow $w.out -orient horizontal
 
 	label $w.path -text "$commit:$path" \
 		-anchor w \
@@ -3161,122 +3160,126 @@ proc show_blame {commit path} {
 		-borderwidth 1 \
 		-relief sunken \
 		-font font_uibold
-	pack $w.path -anchor w -side top -fill x
+	pack $w.path -side top -fill x
 
 	set hbg #e2effa
-	frame $w.out.commit -width 10 -height 10
-	label $w.out.commit.l -text Commit \
+	frame $w.out
+	label $w.out.commit_l -text Commit \
+		-relief solid \
+		-borderwidth 1 \
 		-background $hbg \
 		-font font_uibold
-	text $w.out.commit.t \
+	text $w.out.commit_t \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width 9 \
 		-font font_diff
-	pack $w.out.commit.l -side top -fill x
-	pack $w.out.commit.t -fill both
-	$w.out add $w.out.commit
-	lappend texts $w.out.commit.t
+	lappend texts $w.out.commit_t
 
-	frame $w.out.author -width 10 -height 10
-	label $w.out.author.l -text Author \
+	label $w.out.author_l -text Author \
+		-relief solid \
+		-borderwidth 1 \
 		-background $hbg \
 		-font font_uibold
-	text $w.out.author.t \
+	text $w.out.author_t \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width 20 \
 		-font font_diff
-	pack $w.out.author.l -side top -fill x
-	pack $w.out.author.t -fill both
-	$w.out add $w.out.author
-	lappend texts $w.out.author.t
+	lappend texts $w.out.author_t
 
-	frame $w.out.date -width 10 -height 10
-	label $w.out.date.l -text Date \
+	label $w.out.date_l -text Date \
+		-relief solid \
+		-borderwidth 1 \
 		-background $hbg \
 		-font font_uibold
-	text $w.out.date.t \
+	text $w.out.date_t \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width [string length "yyyy-mm-dd hh:mm:ss"] \
 		-font font_diff
-	pack $w.out.date.l -side top -fill x
-	pack $w.out.date.t -fill both
-	$w.out add $w.out.date
-	lappend texts $w.out.date.t
+	lappend texts $w.out.date_t
 
-	frame $w.out.filename -width 10 -height 10
-	label $w.out.filename.l -text Filename \
+	label $w.out.filename_l -text Filename \
+		-relief solid \
+		-borderwidth 1 \
 		-background $hbg \
 		-font font_uibold
-	text $w.out.filename.t \
+	text $w.out.filename_t \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width 20 \
 		-font font_diff
-	pack $w.out.filename.l -side top -fill x
-	pack $w.out.filename.t -fill both
-	$w.out add $w.out.filename
-	lappend texts $w.out.filename.t
+	lappend texts $w.out.filename_t
 
-	frame $w.out.origlinenumber -width 10 -height 10
-	label $w.out.origlinenumber.l -text {Orig Line} \
+	label $w.out.origlinenumber_l -text {Orig Line} \
+		-relief solid \
+		-borderwidth 1 \
 		-background $hbg \
 		-font font_uibold
-	text $w.out.origlinenumber.t \
+	text $w.out.origlinenumber_t \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width 5 \
 		-font font_diff
-	$w.out.origlinenumber.t tag conf linenumber -justify right
-	pack $w.out.origlinenumber.l -side top -fill x
-	pack $w.out.origlinenumber.t -fill both
-	$w.out add $w.out.origlinenumber
-	lappend texts $w.out.origlinenumber.t
-
-	frame $w.out.linenumber -width 10 -height 10
-	label $w.out.linenumber.l -text {Curr Line} \
+	$w.out.origlinenumber_t tag conf linenumber -justify right
+	lappend texts $w.out.origlinenumber_t
+
+	label $w.out.linenumber_l -text {Curr Line} \
+		-relief solid \
+		-borderwidth 1 \
 		-background $hbg \
 		-font font_uibold
-	text $w.out.linenumber.t \
+	text $w.out.linenumber_t \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width 5 \
 		-font font_diff
-	$w.out.linenumber.t tag conf linenumber -justify right
-	pack $w.out.linenumber.l -side top -fill x
-	pack $w.out.linenumber.t -fill both
-	$w.out add $w.out.linenumber
-	lappend texts $w.out.linenumber.t
-
-	frame $w.out.file -width 10 -height 10
-	label $w.out.file.l -text {File Content} \
+	$w.out.linenumber_t tag conf linenumber -justify right
+	lappend texts $w.out.linenumber_t
+
+	label $w.out.file_l -text {File Content} \
+		-relief solid \
+		-borderwidth 1 \
 		-background $hbg \
 		-font font_uibold
-	text $w.out.file.t \
+	text $w.out.file_t \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width 80 \
+		-xscrollcommand [list $w.out.sbx set] \
 		-font font_diff
-	pack $w.out.file.l -side top -fill x
-	pack $w.out.file.t -fill both
-	$w.out add $w.out.file
-	lappend texts $w.out.file.t
+	lappend texts $w.out.file_t
+
+	scrollbar $w.out.sbx -orient h -command [list $w.out.file_t xview]
+	scrollbar $w.out.sby -orient v \
+		-command [list scrollbar2many $texts yview]
+	set labels [list]
+	foreach i $texts {
+		regsub {_t$} $i _l l
+		lappend labels $l
+	}
+	set file_col [expr {[llength $texts] - 1}]
+	eval grid $labels -sticky we
+	eval grid $texts $w.out.sby -sticky nsew
+	grid conf $w.out.sbx -column $file_col -sticky we
+	grid columnconfigure $w.out $file_col -weight 1
+	grid rowconfigure $w.out 1 -weight 1
+	pack $w.out -fill both -expand 1
 
 	label $w.status -textvariable blame_status($w) \
 		-anchor w \
@@ -3284,12 +3287,7 @@ proc show_blame {commit path} {
 		-borderwidth 1 \
 		-relief sunken \
 		-font font_ui
-	pack $w.status -anchor w -side bottom -fill x
-
-	scrollbar $w.sby -orient v \
-		-command [list scrollbar2many $texts yview]
-	pack $w.sby -side right -fill y
-	pack $w.out -side left -fill both -expand 1
+	pack $w.status -side bottom -fill x
 
 	menu $w.ctxm -tearoff 0
 	$w.ctxm add command -label "Copy Commit" \
@@ -3301,7 +3299,7 @@ proc show_blame {commit path} {
 			-background [$i cget -foreground] \
 			-foreground [$i cget -background]
 		$i conf -yscrollcommand \
-			[list many2scrollbar $texts yview $w.sby]
+			[list many2scrollbar $texts yview $w.out.sby]
 		bind $i <Button-1> "blame_highlight $i @%x,%y $texts;break"
 		bind_button3 $i "
 			set cursorX %x
@@ -3324,7 +3322,7 @@ proc show_blame {commit path} {
 	fconfigure $fd -blocking 0 -translation lf -encoding binary
 	fileevent $fd readable [list read_blame_catfile \
 		$fd $w $commit $path \
-		$texts $w.out.linenumber.t $w.out.file.t]
+		$texts $w.out.linenumber_t $w.out.file_t]
 }
 
 proc read_blame_catfile {fd w commit path texts w_lno w_file} {