eglfs: fix cleanup when more than one tlw was used

There is nothing guaranteeing there is a context current when the
backingstore dtor is invoked for widget windows that do not contain
render-to-texture widgets. In some cases the eglfs compositor's
context is still current, while in other cases (esp. when having
popups and other top-levels) there is none.

To prevent not releasing the backingstore texture and the incorrect
warning about incorrect context, make the correct context current via
an offscreen surface, when necessary.

Change-Id: Id8257650c1ec8cf96910a4f285b779419c3558a8
Reviewed-by: Paul Olav Tvete <paul.tvete@theqtcompany.com>

0 files changed, 0 insertions, 0 deletions