Fix setVisible() of QWidget has no effect in QTreeWidgetItem

Check if the item is hidden before show the item(QWidget)

Task-number: QTBUG-13522
Change-Id: I1c605d5cb8a80f340e9b7601612d3760f51cb4a7
Reviewed-by: Liang Qi <liang.qi@digia.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Reviewed-by: David Faure <david.faure@kdab.com>
Don't cache QCoreApplication::appName.

This isn't a hot codepath, there is no gain to doing this. It introduces
unnecessary bloat (see e.g.
https://www.webkit.org/blog/2826/unusual-speed-boost-size-matters/) and
complicates boosting Qt application startup in cases where argv[0] is
overwritten.

Change-Id: I55b2b98b0de6b06fe7a049de262f3e19936b73db
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
export QT_NO_<foo> equivalents to the build system

this makes it possible to properly exclude entire subprojects based on the
availability of features, rather than stuffing every single source file
with #ifdefs.

the defines are aggregated from the -qconfig <profile>,
-no-feature-<foo> and some other configure flags.

usage:

load(qfeatures)
!contains(QT_DISABLED_FEATURES, textarea): SUBDIRS += textstuff

Task-number: QTBUG-28102
Change-Id: I83400632d64312fa4b907e1318dddfe27c432387
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Peter Hartmann <phartmann@blackberry.com>
Reviewed-by: Tasuku Suzuki <stasuku@gmail.com>
use the right scope

"windows" only worked more or less by accident (it's the opposite of
"console" and just happens to be the default on windows).

Change-Id: Ib60c8ae5aea04f28207c05cc0005183dd6eb6244
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
use private linkage where possible

Change-Id: Ie8eaa71bee87654c21218a23efd7e9d65b71f022
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>