git-gui: Use a grid layout for branch dialog.

Using a stack of frames in the Starting Revision section of the new
branch dialog turned out to be a mess.  The varying lengths of each
label caused the optionMenu widgets to be spread around the screen
at unaligned locations, making the interface very kludgy looking.

Now we layout the major sections of the branch dialog using grid
rather than pack, allowing these widgets to line up vertically in
a nice neat column.  All extra space is given to column 1, which is
where we have located the text fields.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -1683,7 +1683,7 @@ proc do_create_branch_action {w} {
 	global create_branch_checkout create_branch_revtype
 	global create_branch_head create_branch_trackinghead
 
-	set newbranch [string trim [$w.desc.name.t get 0.0 end]]
+	set newbranch [string trim [$w.desc.name_t get 0.0 end]]
 	if {![catch {exec git show-ref --verify -- "refs/heads/$newbranch"}]} {
 		tk_messageBox \
 			-icon error \
@@ -1691,7 +1691,7 @@ proc do_create_branch_action {w} {
 			-title [wm title $w] \
 			-parent $w \
 			-message "Branch '$newbranch' already exists."
-		focus $w.desc.name.t
+		focus $w.desc.name_t
 		return
 	}
 	if {[catch {exec git check-ref-format "heads/$newbranch"}]} {
@@ -1701,7 +1701,7 @@ proc do_create_branch_action {w} {
 			-title [wm title $w] \
 			-parent $w \
 			-message "We do not like '$newbranch' as a branch name."
-		focus $w.desc.name.t
+		focus $w.desc.name_t
 		return
 	}
 
@@ -1709,7 +1709,7 @@ proc do_create_branch_action {w} {
 	switch -- $create_branch_revtype {
 	head {set rev $create_branch_head}
 	tracking {set rev $create_branch_trackinghead}
-	expression {set rev [string trim [$w.from.exp.t get 0.0 end]]}
+	expression {set rev [string trim [$w.from.exp_t get 0.0 end]]}
 	}
 	if {[catch {set cmt [exec git rev-parse --verify "${rev}^0"]}]} {
 		tk_messageBox \
@@ -1778,18 +1778,18 @@ proc do_create_branch {} {
 	labelframe $w.desc \
 		-text {Branch Description} \
 		-font font_ui
-	frame $w.desc.name
-	label $w.desc.name.l -text {Name:} -font font_ui
-	text $w.desc.name.t \
+	label $w.desc.name_l -text {Name:} -font font_ui
+	text $w.desc.name_t \
 		-borderwidth 1 \
 		-relief sunken \
 		-height 1 \
 		-width 40 \
 		-font font_ui
-	bind $w.desc.name.t <Shift-Key-Tab> "focus $w.postActions.checkout;break"
-	bind $w.desc.name.t <Key-Tab> "focus $w.from.exp.t;break"
-	bind $w.desc.name.t <Key-Return> "do_create_branch_action $w;break"
-	bind $w.desc.name.t <Key> {
+	grid $w.desc.name_l $w.desc.name_t -stick we -padx {0 5}
+	bind $w.desc.name_t <Shift-Key-Tab> "focus $w.postActions.checkout;break"
+	bind $w.desc.name_t <Key-Tab> "focus $w.from.exp_t;break"
+	bind $w.desc.name_t <Key-Return> "do_create_branch_action $w;break"
+	bind $w.desc.name_t <Key> {
 		if {{%K} ne {BackSpace}
 			&& {%K} ne {Tab}
 			&& {%K} ne {Escape}
@@ -1798,9 +1798,7 @@ proc do_create_branch {} {
 			if {[string first %A {~^:?*[}] >= 0} break
 		}
 	}
-	pack $w.desc.name.l -side left -padx 5
-	pack $w.desc.name.t -side left -fill x -expand 1
-	pack $w.desc.name -padx 5 -fill x -expand 1
+	grid columnconfigure $w.desc 1 -weight 1
 	pack $w.desc -anchor nw -fill x -pady 5 -padx 5
 
 	set all_trackings [list]
@@ -1816,46 +1814,38 @@ proc do_create_branch {} {
 	labelframe $w.from \
 		-text {Starting Revision} \
 		-font font_ui
-	frame $w.from.head
-	radiobutton $w.from.head.r \
+	radiobutton $w.from.head_r \
 		-text {Local Branch:} \
 		-value head \
 		-variable create_branch_revtype \
 		-font font_ui
-	eval tk_optionMenu $w.from.head.m create_branch_head $all_heads
-	pack $w.from.head.r -side left
-	pack $w.from.head.m -side left
-	frame $w.from.tracking
-	radiobutton $w.from.tracking.r \
+	eval tk_optionMenu $w.from.head_m create_branch_head $all_heads
+	grid $w.from.head_r $w.from.head_m -sticky w
+	radiobutton $w.from.tracking_r \
 		-text {Tracking Branch:} \
 		-value tracking \
 		-variable create_branch_revtype \
 		-font font_ui
-	eval tk_optionMenu $w.from.tracking.m \
+	eval tk_optionMenu $w.from.tracking_m \
 		create_branch_trackinghead \
 		$all_trackings
-	pack $w.from.tracking.r -side left
-	pack $w.from.tracking.m -side left
-	frame $w.from.exp
-	radiobutton $w.from.exp.r \
+	grid $w.from.tracking_r $w.from.tracking_m -sticky w
+	radiobutton $w.from.exp_r \
 		-text {Revision Expression:} \
 		-value expression \
 		-variable create_branch_revtype \
 		-font font_ui
-	text $w.from.exp.t \
+	text $w.from.exp_t \
 		-borderwidth 1 \
 		-relief sunken \
 		-height 1 \
 		-width 50 \
 		-font font_ui
-	bind $w.from.exp.t <Shift-Key-Tab> "focus $w.desc.name.t;break"
-	bind $w.from.exp.t <Key-Tab> "focus $w.postActions.checkout;break"
-	bind $w.from.exp.t <Key-Return> "do_create_branch_action $w;break"
-	pack $w.from.exp.r -side left
-	pack $w.from.exp.t -side left -fill x -expand 1
-	pack $w.from.head -padx 5 -fill x -expand 1
-	pack $w.from.tracking -padx 5 -fill x -expand 1
-	pack $w.from.exp -padx 5 -fill x -expand 1
+	grid $w.from.exp_r $w.from.exp_t -stick we -padx {0 5}
+	bind $w.from.exp_t <Shift-Key-Tab> "focus $w.desc.name_t;break"
+	bind $w.from.exp_t <Key-Tab> "focus $w.postActions.checkout;break"
+	bind $w.from.exp_t <Key-Return> "do_create_branch_action $w;break"
+	grid columnconfigure $w.from 1 -weight 1
 	pack $w.from -anchor nw -fill x -pady 5 -padx 5
 
 	labelframe $w.postActions \
@@ -1868,7 +1858,7 @@ proc do_create_branch {} {
 	pack $w.postActions.checkout -anchor nw
 	pack $w.postActions -anchor nw -fill x -pady 5 -padx 5
 
-	bind $w <Visibility> "grab $w; focus $w.desc.name.t"
+	bind $w <Visibility> "grab $w; focus $w.desc.name_t"
 	bind $w <Key-Escape> "destroy $w"
 	bind $w <Key-Return> "do_create_branch_action $w;break"
 	wm title $w "[appname] ([reponame]): Create Branch"