This creates an action column widget when the widget is rendered for the
first time.
The original approach was to create an image and render the buffered
image onto the cell until the first mouse action triggered the creation
of the real widget. This led to several rendering problems and triggered
some strange ownership issues with crashes under certain situations.
Followup a05b2ad9
Add a new class QgsDockWidget which has finer control over setting
and retrieving the dock visibility, to account for dock widgets
which are open but hidden by other docks
This allows definition of widgets embedded into layer tree for individual layers in the layer properties dialog (in new Legend tab). The idea is to have a way to quickly access to some actions that are often used with a layer.
The implementation comes with transparency widget, in the future there may be more standard widgets coming, e.g. to setup filtering, selection, style or other stuff. The API allows plugins to register their own widgets, which will be useful for various domain specific plugins to assign custom widgets to layers they manage.
This allows plugins to reuse the shortcuts manager if they
want to add the ability for users to customise their shortcut
key sequences.
The shortcut manager has been extended to also handle customisation
of QShortcut objects as well as QActions.
* Switch QgsMapCanvas zoomIn and zoomOut to slots
* Change shortcuts to zoom in/out tool to Ctrl+Alt +/-, and
make Ctrl + and Ctrl - trigger an immediate zoom in/out
Having Ctrl +/- perform an immediate zoom in/out is standard
across almost all apps with a zoom facility, so we should
respect that same behaviour.
This change also helps bring canvas and composer behaviour
closer together.
(fix#1824)
