fixing this by testing int_com.
```
Traceback (most recent call last):
File "C:/PROGRA~1/QGIS2~1.17/apps/qgis/./python/plugins\processing\core\GeoAlgorithm.py", line 203, in execute
self.processAlgorithm(progress)
File "C:/PROGRA~1/QGIS2~1.17/apps/qgis/./python/plugins\processing\algs\qgis\Intersection.py", line 100, in processAlgorithm
int_geom = QgsGeometry(int_com.difference(int_sym))
```
AttributeError: 'NoneType' object has no attribute 'difference'
The commit 9db908ccbc2257d466c0593738944a08cea8a8bc GdalTools: new style signals generates a regression
In the widgetBatchBase runItem method, refreshArgs is not a SIGNAL
Allows use of a color ramp consisting of a list of selected colors.
Currently there's no way in QGIS to classify a renderer using
some list of colors you've previously selected. So you can modify
the colors manually after classifying, but that's a pain
if you're regularly using the same color scheme.
Basically, it's like the color brewer color ramp options but
allowing users to pick their own preset list of colors to use*
(Because Cynthia Brewer isn't the only cartographic color expert!)
QgsSymbol::RenderHints QFlags value instead of a raw int
Also rename DataDefinedRotation to DynamicRotation since
it is no longer used for data defined rotation
This introduces live preview when rendering WMTS layers - as soon as individual tiles are loaded, they are shown in map canvas... no need to wait with a blank map until all tiles are fully downloaded. Additionally, if there are already locally cached tiles of other zoom levels, they may be used in the preview while the tiles with best matching zoom level are being downloaded. This greatly improves the user experience when working with WMTS layers.
Additionally, I have added native support for XYZ tile layers into WMS provider (based on existing implementation of WMTS tiling). This allows loading of various new raster tile sources (e.g. OpenStreetMap tiles) that were before available only with QuickMapServices or OpenLayers plugins. To use XYZ tile layers, open the browser dock in QGIS and look for "Tile Servers (XYZ)" root entry. Right-clicking will open a menu to add connections. For example for OpenStreetMap the URL would be http://c.tile.openstreetmap.org/{z}/{x}/{y}.png
The work on WMTS live preview has been funded by Land Information New Zealand.
The work on XYZ tile layers has been funded by Lutra Consulting.
