form widgets
This exposes two new "size" options for edit form widgets, allowing
control over the horizontal and vertical stretch factors for the
widget. By setting a horizontal or vertical stretch, users can
control how edit widgets will relatively resize when resizing
an attribute form.
Eg a user can set a higher horizontal stretch value for widgets which should
"grab" more of the available horizontal space, eg for those widgets
which are expected to have longer values and accordingly will
benefit from the extra space.
Similarly, the vertical stretch setting controls how widgets
will relatively grow vertically when resizing forms vertically. (Note
that only some widgets can vertically grow -- eg. spin boxes
can't be stretched vertically!)
Together these options give more control to users over the exact
layout and sizing of their attribute forms.
By default, the stretch values are set to "Default" which is the
same as previous behavior.
The python test test_qgsrelation.py was failing for misterious reasons
(the very same test was passing if run from QGIS application), I tracked
the issue down to the addition of QgsOptionalExpression mCollapsedExpression;
in QgsAttributeEditorContainer.
The new c++ test replicates the python test and make sure there are no
problems with the change style operation.
values should be reused when creating new features
While there has long been a global option that causes ALL field
values for ALL layers to be remembered and reused during a QGIS
session when creating new features, this new setting offers
per-layer, per-field control over whether values should be
reused.
It allows for finer control over form behavior, where eg some
values may be desirable to reuse but others should be cleared
or set from default value expressions.
