Show hint about hunk staging mode being the default now, and how to switch to line mode

It is shown the first time the user enters either staging or patch building.

pkg/gui/controllers/commits_files_controller.go

@@ -494,6 +494,8 @@ func (self *CommitFilesController) enterCommitFile(node *filetree.CommitFileNode
 			}
 
 			self.c.Context().Push(self.c.Contexts().CustomPatchBuilder, opts)
+			self.c.Helpers().PatchBuilding.ShowHunkStagingHint()
+
 			return nil
 		},
 	})

pkg/gui/controllers/files_controller.go

@@ -554,6 +554,8 @@ func (self *FilesController) EnterFile(opts types.OnFocusOpts) error {
 
 	context := lo.Ternary(opts.ClickedWindowName == "secondary", self.c.Contexts().StagingSecondary, self.c.Contexts().Staging)
 	self.c.Context().Push(context, opts)
+	self.c.Helpers().PatchBuilding.ShowHunkStagingHint()
+
 	return nil
 }
 

pkg/gui/controllers/helpers/patch_building_helper.go

@@ -2,8 +2,10 @@ package helpers
 
 import (
 	"errors"
+	"fmt"
 
 	"github.com/jesseduffield/lazygit/pkg/commands/patch"
+	"github.com/jesseduffield/lazygit/pkg/gui/keybindings"
 	"github.com/jesseduffield/lazygit/pkg/gui/patch_exploring"
 	"github.com/jesseduffield/lazygit/pkg/gui/types"
 )
@@ -27,6 +29,19 @@ func (self *PatchBuildingHelper) ValidateNormalWorkingTreeState() (bool, error)
 	return true, nil
 }
 
+func (self *PatchBuildingHelper) ShowHunkStagingHint() {
+	if !self.c.AppState.DidShowHunkStagingHint && self.c.UserConfig().Gui.UseHunkModeInStagingView {
+		self.c.AppState.DidShowHunkStagingHint = true
+		self.c.SaveAppStateAndLogError()
+
+		message := fmt.Sprintf(self.c.Tr.HunkStagingHint,
+			keybindings.Label(self.c.UserConfig().Keybinding.Main.ToggleSelectHunk))
+		self.c.Confirm(types.ConfirmOpts{
+			Prompt: message,
+		})
+	}
+}
+
 // takes us from the patch building panel back to the commit files panel
 func (self *PatchBuildingHelper) Escape() {
 	self.c.Context().Pop()