Keep the same commit selected when exiting filtering mode

When exiting filtering mode, we currently keep the selection index the same in
the commits panel. This doesn't make sense at all, since the index in the
filtered view has no relation to the index in the unfiltered view.

I often use filtering mode (either by path or by author) to find a given commit
faster than I would otherwise be able to. When exiting filtering mode, it's
useful to keep the same commit selected, so that I can look at the surrounding
commits, see which branch it was a part of, etc. So reselect the commit again
after exiting filtering mode.

Sometimes this is not possible, most likely when the commit is so long ago that
it's outside of the initial 300 range. In that case, at least select the commit
again that was selected before I entered filtering; this is still better than
arbitrarily keeping the same selection index.

pkg/gui/context/local_commits_context.go

@@ -8,6 +8,7 @@ import (
 	"github.com/jesseduffield/lazygit/pkg/commands/types/enums"
 	"github.com/jesseduffield/lazygit/pkg/gui/presentation"
 	"github.com/jesseduffield/lazygit/pkg/gui/types"
+	"github.com/samber/lo"
 )
 
 type LocalCommitsContext struct {
@@ -125,6 +126,29 @@ func (self *LocalCommitsContext) GetSelectedRef() types.Ref {
 	return commit
 }
 
+// Returns the commit hash of the selected commit, or an empty string if no
+// commit is selected
+func (self *LocalCommitsContext) GetSelectedCommitHash() string {
+	commit := self.GetSelected()
+	if commit == nil {
+		return ""
+	}
+	return commit.Sha
+}
+
+func (self *LocalCommitsContext) SelectCommitByHash(hash string) bool {
+	if hash == "" {
+		return false
+	}
+
+	if _, idx, found := lo.FindIndexOf(self.GetItems(), func(c *models.Commit) bool { return c.Sha == hash }); found {
+		self.SetSelection(idx)
+		return true
+	}
+
+	return false
+}
+
 func (self *LocalCommitsContext) GetDiffTerminals() []string {
 	itemId := self.GetSelectedItemId()