Changelog for QGIS 3.42
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* Symbology : Add configurable extent buffer to symbols

* Labelling : Raster labeling

* Labelling : Custom tab distances for labels

* Labelling : Support CSS background property in labels/text renderer

* Labelling : Support CSS margins for block elements in HTML labels

* Labelling : Support CSS line-height in HTML labels

* Mesh : Mesh Render Extent Settings

* Mesh : Mesh editing delaunay refinement

* Mesh : Dataset group controls for mesh layers

* Mesh : Mesh selection actions

* Mesh : Elevation assignment modes for added mesh vertices

* 3D Features : Debug widget for 3D views

* Point Clouds : Virtual point cloud overviews in 2D

* Print Layouts : Double-clicking a mouse handle for a layout label resizes to fit text

* Print Layouts : Action on double click layout item

* Print Layouts : Layout better node item creation

* Print Layouts : Apply layout page size to all pages

* Print Layouts : New quality parameter for layout JPG exports

* Digitising : Highlight Trim/Extend plane of intersection

* Data Management : Enable snapping in Georeferencer

* Data Management : Data Source Manager STAC enhancements

* Forms and Widgets : Additional sorting options on value relation widget

* Processing : Processing metadata tools

* Processing : Expression based hover content in Scatterplots

* Processing : Add option to include 'layer' and 'path' attributes in Merge Vector Layers tool

* Processing : Move Geometry Checker into processing tools

* Processing : Add title, axis titles, and logarithmic axes to plots

* Processing : Raster zonal min/max algorithm

* Processing : Algorithm to extract min/max pixel from raster

* Processing : New algorithm to generate elevation profile images

* Processing : New Mesh: Surface to Polygon Algorithm

* Profile Plots : Introduce custom tolerance for vector layers

* Data Providers : Execute SQL from layer context menu

* Programmability : Expose QgsGeos class to PyQGIS

* Programmability : Make Z and M values accessible via QgsGeometry.as_numpy()

* Programmability : Python console interactive help

* Notable Fixes : Bug fixes by Even Rouault (Spatialys)

* Notable Fixes : Bug fixes by Alessandro Pasotti (QCooperative)

* Notable Fixes : Bug fixes by Julien Cabieces (Oslandia)

* Notable Fixes : Bug fixes by Jacky Volpes (Oslandia)

* Notable Fixes : Bug fixes by Nyall Dawson (North Road)

* Notable Fixes : Bug fixes by Alexander Bruy (QCooperative)

* Notable Fixes : Bug fixes by Mathieu Pellerin (OPENGIS)

* Notable Fixes : Bug fixes by Stefanos Natsis (LutraConsulting)

* Notable Fixes : Bug Fixes by Loïc Bartoletti (Oslandia)

* Notable Fixes : Bug Fixes by Germán Carrillo (OPENGIS)