Changelog for QGIS 3.38
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* Temporal : New temporal mode: pixel value as temporal datetime

* Map Tools : Add Elevation Controller for filtering vertical data in 2d maps

* Map Tools : Add Z range support to map canvas / map settings items

* Map Tools : Add option to set a fixed elevation slice width for elevation controller

* User Interface : Add search option for regular expression based searching

* User Interface : Data defined override: use middle-click to open the Expression Builder dialog window

* Symbology : New single color renderer for rasters

* Symbology : Add support for Wind Barb rendering for mesh vector datasets

* Labelling : Add maximum distance setting for point labels

* Labelling : Add 'over point' placement option for cartographic label mode

* Rendering : Add data defined control over heatmap radius and maximum value

* Print Layouts : Tab character support for QgsTextFormat and QgsTextRenderer

* Print Layouts : Copy composer grids

* Print Layouts : Add z range filter option for layout maps

* Print Layouts : Add buttons to expand or collapse layout legend tree

* Expressions : Add @map_z_range variables reflecting the map's z range values

* Data Management : Duplicate policy on fields when duplicating features

* Data Management : Add "Fixed Time Range Per Band" mode for raster temporal control

* Data Management : Introduce fixed elevation range for raster layers

* Data Management : Introduce fixed elevation range for mesh layers

* Data Management : Add a "fixed range per band" elevation mode for rasters

* Data Management : Add "dynamic elevation range per band" mode for rasters

* Data Management : Add fixed elevation range per dataset group mode for mesh layers

* Data Management : Add option to export all lines with minimal width in dxf exports

* Data Management : Allow users to override the layer names exported to DXF

* Data Management : Create DXF blocks for point symbols with data defined properties

* Data Management : Add option 'Use only selected features' to DXF export

* Data Management : Import/ Export 'DXF Export' dialog settings

* Forms and Widgets : Add CMYK support for Color Widget

* Forms and Widgets : Add parent feature scope when adding/editing a child feature through the relation editor widget

* Forms and Widgets : Add "match contains" to autocompleter in value relation widget

* Forms and Widgets : Implement value relation's grouping functionality

* Layer Legend : Show a color ramp legend for vector heatmap layers

* Layer Legend : Add layer tree filter for "Show Broken Layers Only"

* Processing : Show more detail in history dialog

* Processing : Add "Run Selected Steps" option to model designer

* Processing : Add "View Output Layers" option for model child algorithms

* Processing : Endpoint distance threshold for network analysis

* Processing : Add support for pure date and time decorators

* Application and Project Options : Add vertical crs option for projects

* Application and Project Options : Add elevation range to project properties

* Sensors : Support feature expansion

* Sensors : Add support for SensorThings Multidatastreams

* Sensors : Serial port sensor's data frame delimiter

* Sensors : Add an optional feature limit setting

* Sensors : Implement subset string support for SensorThings

* Profile Plots : Add tolerance for lines and polygons

* Data Providers : Add extent based filtering for SensorThings layers

* Data Providers : Web proxy prefix support for ArcGIS URLs

* Data Providers : Add support for fast extent estimation on SAP HANA connections

* QGIS Server : Default limit for GetFeatureInfo results

* QGIS Server : Add crs information in WMS GetFeatureInfo output when it differs from WGS84

* Programmability : Add replace/ replace all functionality to QgsCodeEditorWidget

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

* Notable Fixes : Bug fixes by Alessandro Pasotti (itOpen / qcooperative)

* Notable Fixes : Bug fixes by David Signer (OPENGIS)

* Notable Fixes : Bug fixes by Sandro Santilli (strk)

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

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

* Notable Fixes : Bug fixes by Jean Felder (Oslandia)

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