QQuickPopup: support popups with negative insetsHEADdev

A Popup can have negative insets. This means that the
the background will be drawn outside the bounds of the
popup. This is fine when the popup is an item in the
scene, since items are allowed to draw out-of-bounds.

But when placing the popup inside a window, this is no
longer true; Since the window will be resized to the
same size as the popup, the background will be clipped.
Since we plan to make popup windows the default in
Qt 6.8, this clipping will quickly be seen as a regression.

This issue can be seen if opening a context menu in the
Imagine style, since the menus in that style use negative
insets to draw a drop-shadow outside the popup.

In order to make sure that we end up drawing the whole
popup also when using popup windows, this patch will ensure
that we resize the window to also include the (negative)
insets. By positioning the popupItem inside the window
according to the insets, and at the same time, move the window
a bit back and up accordingly, the whole popupItem will
be visible and end up at the requested position.

With this change, the menus in the Imagine style will be
drawn correctly. So update the macOS and Windows styles
as well so that they all implement shadows the same way.
This also allowes us to remove some early changes done
to QQuickPopupItem, like overriding the contains()
function.

Pick-to: 6.8
Change-Id: I7a0b597bc768d3c485a125c644139dfc7eb0b8ab
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

0 files changed, 0 insertions, 0 deletions