expand to path when switching to tree mode

pkg/gui/files_panel.go

@@ -848,6 +848,10 @@ func (gui *Gui) handleToggleFileTreeView() error {
 
 	gui.State.FileChangeManager.ToggleShowTree()
 
+	if path != "" {
+		gui.State.FileChangeManager.ExpandToPath(path)
+	}
+
 	// find that same node in the new format and move the cursor to it
 	if path != "" {
 		index, found := gui.State.FileChangeManager.GetIndexForPath(path)

pkg/gui/filetree/file_change_manager.go

@@ -2,6 +2,7 @@ package filetree
 
 import (
 	"fmt"
+	"os"
 	"strings"
 
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
@@ -141,3 +142,12 @@ func (m *FileChangeManager) renderAux(s *FileChangeNode, prefix string, depth in
 
 	return arr
 }
+
+func (m *FileChangeManager) ExpandToPath(path string) {
+	// need every directory along the way
+	split := strings.Split(path, string(os.PathSeparator))
+	for i := range split {
+		dir := strings.Join(split[0:i+1], string(os.PathSeparator))
+		m.collapsedPaths[dir] = false
+	}
+}