Fixed defect in handling of expose events for Symbian

Commit bc82db did not correctly handle native child widgets.

Consider the case when we have a top-level widget A with a native
child widget B.  When QSymbianControl::Draw() is called on the
control corresponding to B, the following occurs:
    1. The inExpose flag is set in B's QWExtra structure.
    2. The call to syncBackingStore() results in a call to
       QWidgetBackingStore::flush(), passing default parameters.
    3. Because no target widget was passed to flush(), this
       function selects the top-level widget (A) as the target for
       the flush operation, passing A as the first argument of
       QS60WindowSurface::flush().
    4. QS60WindowSurface::flush() checks the inExpose flag from A's
       QWExtra structure, finds it to be false, and proceeds to
       call DrawNow() on A's control.

Because QSymbianControl::Draw() uses the default graphics context,
this context is shared between controls.  This means that the DrawNow()
call in step 4 causes a WSERV-10 panic (Activate() called on an
already-active) graphics context.

This patch moves the inExpose flag from B's QWExtra into A's QTLWExtra,
with the result that the call to DrawNow() in step 4 is suppressed.

Task-number: QTBUG-7960
Reviewed-by: axis
(cherry picked from commit 46df42af1a25fd06247bb96d9e0bf24bf19defe8)

0 files changed, 0 insertions, 0 deletions