Changelog for QGIS 3.12
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* User Interface : Deselecting tables when adding PostgreSQL data after add button is clicked.

* Expressions : Search Tags for Functions

* Expressions : List Referenced Layer Values

* Digitising : Edit Invalid Attributes on Copy/Paste to Another Layer

* Data Management : DXF Export Improvements

* Processing : Package new layers to existing GeoPackage

* Data Providers : Changed WMTS layer collection icon

* Data Providers : Added Metadata URL property in the layer metadata tab for WMS / WMTS and WCS  services

* Data Providers : Fetch and show dimensions metadata  for a WMS layer metadata

* Data Providers : Added refresh action to OGC services entries