This adds a new gui widget QgsFieldValuesLineEdit which includes
an autocompleter populated with current field values.
The autocompleter is nicely updated in the background so that
the gui remains nice and responsive, even if there's millions
of records in the associated table.
It's now used as a search widget for text fields, so can be seen
in the browser window if you set the filter to a text field, or
if you launch the form based select/filter by selecting a layer
and pressing F3.
Now fields using text edit widgets will keep the column filter
as the entered text.
Additionally, the extended filter has been improved to always
take the initial filter from the current filter, even if it's
not an extended filter.
(fix#12422)
This commit adds a new mode to the attribute table dialog for searching
and filtering features. When activated (using a button on the toolbar
or by pressng CTRL+F), the dialog will switch to form view and all
widgets are replaced with their search widget wrapper variant.
Alongside each widget is a tool button with options for controlling
the search/filter behaviour for that field, eg "equal to", "not equal
to", "is null", "greater than", etc.., with the options presented
matching themselves to the corresponding field and widget type.
New buttons appear at the bottom of the form for either selecting
matching features (with options for add to selection/remove from
selection/select within current selection) or filtering features
in the table (with options for adding features to a current filter
or further restricting a current filter).
Sponsored by SIGE
QString methods
Using single quotes is a significant performance boost. Rough
benchmarks indicate the QString single quote methods take
about 15% of the time the double quote variants take.
If a .ui file is specified and the widget specified in the .ui file is not
supported by the widgetwrapper which is configured in the layer properties
the system will automatically try to find a better suitable widgetwrapper.
To do this, widgetwrappers (respectively their factories) can return a map of
supported widget types with priority values.
The widgetwrapper which offers the heighest priority for a certain widget type
will be used in case of a mismatch.
Sponsored by OPENGIS.ch special projects team (aka gis.se troubleshooting
section)
