git-gui: Change main window layout to support wider screens

The layout is changed to have the file lists at the left (Unstaged
Changes at the top, Staged Changes below it) and the diff window
at the right (with the commit area below it).

  +----------+---------------------+
  | Unstaged |  Diff area          |
  |          |                     |
  |          |                     |
  |          |                     |
  +----------+                     |
  | Staged   |                     |
  |          +---------------------+
  |          |  Commit area        |
  |          |                     |
  +----------+---------------------+

The advantages are:

  - The height of the file lists can be adjusted independently to
    fit the files that they contain.
  - The diff viewer is higher.

On wide screens it is ok that the main window is now generally
wider, too.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -1658,8 +1658,8 @@ proc do_quit {} {
 		#
 		set cfg_geometry [list]
 		lappend cfg_geometry [wm geometry .]
-		lappend cfg_geometry [lindex [.vpane sash coord 0] 1]
-		lappend cfg_geometry [lindex [.vpane.files sash coord 0] 0]
+		lappend cfg_geometry [lindex [.vpane sash coord 0] 0]
+		lappend cfg_geometry [lindex [.vpane.files sash coord 0] 1]
 		if {[catch {set rc_geometry $repo_config(gui.geometry)}]} {
 			set rc_geometry {}
 		}
@@ -2208,8 +2208,8 @@ pack .branch -side top -fill x
 
 # -- Main Window Layout
 #
-panedwindow .vpane -orient vertical
-panedwindow .vpane.files -orient horizontal
+panedwindow .vpane -orient horizontal
+panedwindow .vpane.files -orient vertical
 .vpane add .vpane.files -sticky nsew -height 100 -width 200
 pack .vpane -anchor n -side top -fill both -expand 1
 
@@ -2231,7 +2231,6 @@ pack .vpane.files.index.title -side top -fill x
 pack .vpane.files.index.sx -side bottom -fill x
 pack .vpane.files.index.sy -side right -fill y
 pack $ui_index -side left -fill both -expand 1
-.vpane.files add .vpane.files.index -sticky nsew
 
 # -- Working Directory File List
 #
@@ -2251,7 +2250,9 @@ pack .vpane.files.workdir.title -side top -fill x
 pack .vpane.files.workdir.sx -side bottom -fill x
 pack .vpane.files.workdir.sy -side right -fill y
 pack $ui_workdir -side left -fill both -expand 1
+
 .vpane.files add .vpane.files.workdir -sticky nsew
+.vpane.files add .vpane.files.index -sticky nsew
 
 foreach i [list $ui_index $ui_workdir] {
 	rmsel_tag $i
@@ -2264,8 +2265,8 @@ unset i
 frame .vpane.lower -height 300 -width 400
 frame .vpane.lower.commarea
 frame .vpane.lower.diff -relief sunken -borderwidth 1
-pack .vpane.lower.commarea -side top -fill x
-pack .vpane.lower.diff -side bottom -fill both -expand 1
+pack .vpane.lower.diff -fill both -expand 1
+pack .vpane.lower.commarea -side bottom -fill x
 .vpane add .vpane.lower -sticky nsew
 
 # -- Commit Area Buttons
@@ -2591,11 +2592,11 @@ catch {
 set gm $repo_config(gui.geometry)
 wm geometry . [lindex $gm 0]
 .vpane sash place 0 \
-	[lindex [.vpane sash coord 0] 0] \
-	[lindex $gm 1]
+	[lindex $gm 1] \
+	[lindex [.vpane sash coord 0] 1]
 .vpane.files sash place 0 \
-	[lindex $gm 2] \
-	[lindex [.vpane.files sash coord 0] 1]
+	[lindex [.vpane.files sash coord 0] 0] \
+	[lindex $gm 2]
 unset gm
 }