#11243: Disable simplification when OTFR transform fails
[TopoViewer] fix layer visibility after QgsLegendInterface API changes

It was broken with 2.4, whereas QgsLegendInterface::moveLayer started
forcing layer visibility on (undocumented behaviour).

Fixes #11382
[composer] Avoid crash when using redo on multiframe (fix #11351)

Since multiframe changes can remove and create new frame items,
it's not safe to directly manipulate frame items in
QgsComposerItemCommand. Now, commands which apply to a frame always
fetch a reference to the correct frame item directly from the
parent multiframe. Also added unit tests for this crash.
use default button action instead of adding a new one (relation reference and editor widgets)
use layer's displayExpression in relation reference widget line edit
[editwidgets] text color for r/o line edits matches disabled color

Line edits are set to readonly to make it possible to copy values from disabled
forms. Unfortunately Qt uses a style that makes them look editable even though
they are not. This patches the text color to have the appearance that hints an
uneditable widget.

Fix #11413
fix deprecation warnings
fix where clase when multiple features are filtered by id (fixes #11336, fixes #11408)
allow setting visiblity of selected layers (fixes #10835)
avoid creating a histogram without range (fixes #10832)
fix geography detection (fixes #11375)
Adding python unit tests for graduated renderer - part 1
Further unit tests
Fix render state not restored from QDomElement
restore active window after requesting credentials (fixes #11355)
avoid creating a histogram without range (fixes #11217)
combine layer type and edit icon when editing (fixes #11411)
use layer title instead of name in server getlegendgraphic response (fixes #11406)
add new parameter to SAGA split shapes tool
Merge pull request #1633 from gioman/saga_split_shapes_new_option

add new parameter to SAGA split shapes tool, fixes #11427