Document Qt.application.supportsMultipleWindows property.

The documentation was not added in
0df606e2ab8f3b60e1ad57dba245acf2e7810612.

Change-Id: I0a5802a66021e17d1280f3969981c9e8a62c8119
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Make effectiveDevicePixelRatio() return a qreal.

Fractional scale factors are not as broken as previously
believed, especially for Qt Quick. Keep the door open
for finding a way to support it at some point in the
future.

Change-Id: Ifeadcc53175ac6c25ea0288d5fe1966e3de408f9
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
Fix loading of .ui.qml form files with cached compilation units

Simplify the type loading logic and try the Type -> Type.qml and Type ->
Type.ui.qml mapping in a simple loop that tries off-disk and cached
compilation unit loading.

Change-Id: I537feabd0a158a71f330bede9e6988291298ae81
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Skip tst_qquickwindow::headless() when using ANGLE/Windows.

The test crashes frequently.

Task-number: QTBUG-42967
Change-Id: Ic17c6187bfa657154a9b04eb9c5b9a3de291cb1e
Reviewed-by: Andrew Knight <andrew.knight@theqtcompany.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
Regression: Fix array data corruption

When inserting into a sparse JS array, we may have to re-allocate the
underlying data vector. When that happens we must reload the ArrayData
pointer, to avoid returning a wrong pointer in ArrayData::insert.

This patch also fixes the valgrind support in the memory allocator by correctly
marking the mmap'ed memory region as inaccessible.

Change-Id: I86aabc2cec74a4f3c8396463910d90c8968a741d
Task-number: QTBUG-42956
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Added change log for 5.4.0

Change-Id: Ie3e238a3ccac1d95978229316977d131be3010d6
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Merge remote-tracking branch 'origin/5.4.0' into 5.4

Change-Id: I89bbb2977350a03c156d531f810d08a5560ffbb3
Merge "Merge remote-tracking branch 'origin/5.4.0' into 5.4" into refs/staging/5.4