Micro-optimize qdoc

Avoid redundant QStringRef to QString conversions.

Change-Id: I535e7ba02b4ac5abef6036f631e228205e63f32a
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Micro-optimize uic

Avoid redundant QStringRef to QString conversion.

Change-Id: I93c4f19798e81515f483371f0cc6fcccc7fe36c7
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Add QString::splitRef functions.

The functions can be used to optimize code that do not need to use
the split results as QString directly.

[ChangeLog][QtCore] QString can now split a string to a list of
QStringRef.

Change-Id: Ic2dc929e1fba82f9a060e37c51068a301cb5b866
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Micro-optimize QXmlStreamReaderPrivate.

Avoid redundant QStringRef to QString conversions.

Change-Id: I4a65119e7821206e2f72387a5d02cec5ce39dbfb
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Windows plugin: Refactor input context.

- Use static invocation of QGuiApplication accessor.
- Use QInputMethod::queryFocusObject().

Task-number: QTBUG-40402
Change-Id: Ic1a7f66389df532acca88ddda37d35d6e7049a53
Reviewed-by: Lars Knoll <lars.knoll@digia.com>