fix: go to top of diff when switching files

Author: dlvhdr

pkg/ui/mainModel.go

@@ -107,11 +107,13 @@ func (m mainModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				cmds = append(cmds, dfCmd)
 			case "up", "k", "ctrl+p":
 				if m.cursor > 0 {
+					m.diffViewer.GoToTop()
 					cmd = m.setCursor(m.cursor - 1)
 					cmds = append(cmds, cmd)
 				}
 			case "down", "j", "ctrl+n":
 				if m.cursor < len(m.files)-1 {
+					m.diffViewer.GoToTop()
 					cmd = m.setCursor(m.cursor + 1)
 					cmds = append(cmds, cmd)
 				}

pkg/ui/panes/diffviewer/diffviewer.go

@@ -112,6 +112,10 @@ func (m Model) SetFilePatch(file *gitdiff.File) (Model, tea.Cmd) {
 	return m, diff(m.file, m.Width)
 }
 
+func (m *Model) GoToTop() {
+	m.vp.GotoTop()
+}
+
 func diff(file *gitdiff.File, width int) tea.Cmd {
 	if width == 0 || file == nil {
 		return nil