QmlProfiler: Constrain the length of painted events to the visible area

When overpainting, some note markers won't be visible.

Change-Id: I7888d43e8b1e3503b7a90e773e9c8138b70070f0
Task-number: QTCREATORBUG-13534
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>
Theming: Make focused buttons lighter

They're very hard to discover.

Change-Id: I995913866a8bdab4534da05e96c3713e927e955a
Reviewed-by: Thorben Kroeger <thorbenkroeger@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
Theming: Remove unneeded QPalette::All arguments.

That's the default.

Change-Id: Icf1749868f9a659b2c8b631b3c40cbde559e9d19
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>