allow configurable main panel split

docs/Config.md

@@ -15,6 +15,7 @@ Default path for the config file:
     scrollPastBottom: true # enable scrolling past the bottom
     sidePanelWidth: 0.3333 # number from 0 to 1
     expandFocusedSidePanel: false
+    mainPanelSplitMode: 'flexible' # one of 'horizontal' | 'flexible' | 'vertical'
     theme:
       lightTheme: false # For terminals with a light background
       activeBorderColor:

pkg/config/app_config.go

@@ -247,6 +247,7 @@ func GetDefaultConfig() []byte {
   skipStashWarning: true
   sidePanelWidth: 0.3333
   expandFocusedSidePanel: false
+  mainPanelSplitMode: 'flexible' # one of 'horizontal' | 'flexible' | 'vertical'
   theme:
     lightTheme: false
     activeBorderColor:

pkg/gui/arrangement.go

@@ -132,10 +132,19 @@ func (gui *Gui) getViewDimensions(informationStr string, appStatus string) map[s
 					},
 					{
 						conditionalDirection: func(width int, height int) int {
-							if width < 160 && height > 30 { // 2 80 character width panels
+							mainPanelSplitMode := gui.Config.GetUserConfig().GetString("gui.mainPanelSplitMode")
+
+							switch mainPanelSplitMode {
+							case "vertical":
 								return ROW
-							} else {
+							case "horizontal":
 								return COLUMN
+							default:
+								if width < 160 && height > 30 { // 2 80 character width panels
+									return ROW
+								} else {
+									return COLUMN
+								}
 							}
 						},
 						direction: COLUMN,