Fix tab not working in a particular case

The repro:

1. Press tab to select the path element.
2. Press 2 (or 1) to switch to a different grouplike listing.
3. Press 1 (or 2) to switch back. Note that the root.select()'ed element
   is the grouplike listing's form, i.e. the list of tracks/groups, not
   the path element.
4. Press tab. Note that the root.select()'ed element does not change.

This fixes the issue by setting curIndex to 0, which is the index of the
grouplike listing's form. This makes the tab key behave correctly and
select the path element in step 4.

1 files changed, 1 insertions, 0 deletions

diff --git a/ui.js b/ui.js
index befa764..ac7154d 100644
--- a/ui.js
+++ b/ui.js
@@ -733,6 +733,7 @@ class GrouplikeListingElement extends Form {
   }
 
   selected() {
+    this.curIndex = 0
     this.root.select(this.form)
   }