Press enter in main view of commits panel to enter patch building for clicked line

This involves first switching to the commit files view, and then entering the
clicked file from there.

Author: stefanhaller

Diff for: pkg/gui/controllers/switch_to_diff_files_controller.go

@@ -1,6 +1,9 @@
 package controllers
 
 import (
+	"path/filepath"
+
+	"github.com/jesseduffield/lazygit/pkg/gui/filetree"
 	"github.com/jesseduffield/lazygit/pkg/gui/types"
 )
 
@@ -47,6 +50,41 @@ func (self *SwitchToDiffFilesController) GetKeybindings(opts types.KeybindingsOp
 	return bindings
 }
 
+func (self *SwitchToDiffFilesController) GetOnClickFocusedMainView() func(mainViewName string, clickedLineIdx int) error {
+	return func(mainViewName string, clickedLineIdx int) error {
+		clickedFile, line, ok := self.c.Helpers().Staging.GetFileAndLineForClickedDiffLine(mainViewName, clickedLineIdx)
+		if !ok {
+			return nil
+		}
+
+		if err := self.enter(); err != nil {
+			return err
+		}
+
+		context := self.c.Contexts().CommitFiles
+		var node *filetree.CommitFileNode
+
+		relativePath, err := filepath.Rel(self.c.Git().RepoPaths.RepoPath(), clickedFile)
+		if err != nil {
+			return err
+		}
+		relativePath = "./" + relativePath
+		context.CommitFileTreeViewModel.ExpandToPath(relativePath)
+		self.c.PostRefreshUpdate(context)
+
+		idx, ok := context.CommitFileTreeViewModel.GetIndexForPath(relativePath)
+		if !ok {
+			return nil
+		}
+
+		context.SetSelectedLineIdx(idx)
+		context.GetViewTrait().FocusPoint(
+			context.ModelIndexToViewIndex(idx))
+		node = context.GetSelected()
+		return self.c.Helpers().CommitFiles.EnterCommitFile(node, types.OnFocusOpts{ClickedWindowName: "main", ClickedViewLineIdx: line, ClickedViewRealLineIdx: line})
+	}
+}
+
 func (self *SwitchToDiffFilesController) Context() types.Context {
 	return self.context
 }