[composer] Don't save hide bounding box setting between sessions

In practice the workflow is better if this setting is only
temporarily applied to a composer.
[FIXED] #11572 ilter Legend By Map Content doesn't maintain point displacement legend

For point vector layer render with 'displacement point', when 'Filter
 Legend By Map Content' is activated, the legend is not rendered even
 if it has to be.

It's due to QgsPointDisplacementRenderer that embedded the real
 renderer.

The solution proposed in this patch is to get the embedded renderer
 for QgsPointDisplacementRenderer.
browser last expanded better
[processing] add method in OGR algorithms for getting layer name from source
Update gridcalculator.rst

change **x** and **y** with **a** and **b**
Merge pull request #1678 from ghtmtt/patch-2

Update gridcalculator.rst
Revert "Doxygen: do not add "Definition at line N of XYZ.cpp" to each method"

This reverts commit 7ee05afd366cebf3c8f44354067c34223346f835.
debian packaging update (fixes for tests)
Fix expression test

make sure the style file with the color ramp can be copied to the settings path
Fix dual view test

* References commit 51e01d6
* And issue #11529
fix PyQgsVectorLayer test
Fix occasional crash on exit because of statis network access manager

see https://bugreports.qt-project.org/browse/QTBUG-25789
fix regex for getting layer name
[GRASS] autorefresh vector layers
use connection name in wms,wfs,wcs data item path instead of uri, group ows servers by connection name instead of uri
use browser objectName in settings key to distinguish browser2
Fix maprenderertest

By introducing some color tolerance