[Webkit-unassigned] [Bug 178380] New: IndexedDB index cursor stops when updating an object

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178380

            Bug ID: 178380
           Summary: IndexedDB index cursor stops when updating an object
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: david.fahlander at gmail.com

Steps to reproduce:

1. Opening a cursor on an index (IDBIndex.prototype.openCursor())
2. req.onsuccess: call cursor.update() or store.put() 
3. Next req.onsuccess indicates end of iteration (req.result is falsy)

Expected behavior:

...
3. Next req.onsuccess lands on the next object matched in the index.

Note: There seems not to be an issue for IDBObjectStore.prototype.openCursor(), it's just IDBIndex that fails.

Repro: http://dexie.org/test/dexie-issue-594/index.html

The repro should show:
  3
  3

But with Safari 10 or 11, it shows
  3
  1

The reason the last digit is 1, is because a call to Dexie.Collection.modify() will stop after first match, as it calls cursor.update() on it.

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