Repository, Packages: no stale detail pane; scan survives races

A reload or filter that drops the current row left its pane and link up,
and the link then crashed on current() being None (Packages had the same).
A .txz slackrepo replaces between glob and stat is skipped, and any
exception in the scan thread reaches the stats line instead of leaving it
at loading.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/sb_builder/repository.py b/sb_builder/repository.py
index 29f4291..38c6ecc 100644
--- a/sb_builder/repository.py
+++ b/sb_builder/repository.py
@@ -106,7 +106,10 @@ def scan(path):
         m = PKGFILE.match(os.path.basename(f))
         if not m:
             continue
-        st = os.stat(f)
+        try:
+            st = os.stat(f)
+        except FileNotFoundError:
+            continue  # slackrepo replaced it since the glob
         item = os.path.relpath(os.path.dirname(f), path)  # category/pkg
         info = meta.get(os.path.basename(f))
         rows.append({**m.groupdict(), "category": item.split("/")[0], "file": f,
@@ -283,7 +286,7 @@ class RepositoryTab(QWidget):
         def work():
             try:
                 self.scanned.emit(gen, scan(path), "")
-            except OSError as e:
+            except Exception as e:  # the thread's boundary: never stuck at loading
                 self.scanned.emit(gen, None, str(e))
         threading.Thread(target=work, daemon=True).start()
 
@@ -292,12 +295,13 @@ class RepositoryTab(QWidget):
             return  # an older Refresh, overtaken
         self.model.set_rows(data["rows"] if data else [])
         self.stats.setText(err or summary(data))
-        self.update_count()
+        self.refilter()
 
     def refilter(self):
         on = {n for n, b in self.chips.items() if b.isChecked()}
         self.proxy.update(self.query.text(), on - {"unpublished"}, "unpublished" in on)
         self.update_count()
+        self.show_detail(self.table.currentIndex(), None)  # a reset or filter can drop it
 
     def update_count(self):
         self.count.setText(f"{self.proxy.rowCount():,} shown")