Overview of Changes in 4.13.5, 07 01 2024
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This release adds two new GSK renderers called vulkan and ngl,
that are built from the same sources. The new renderers can
handle many corner cases correctly that the current gl renderer
does not handle, and they offer advantages such as antialiasing
and supersampled gradients.

The new renderers are still considered experimental, and GTK
will only use them if they are explicitly selected using the
GSK_RENDERER environment variable.

As part of this work, the GSK include files have been rearranged.
It is no longer necessary to include renderer-specific headers for
ngl and vulkan (and doing so will trigger deprecation warnings),
and their constructors are always available.

The previously available experimental GdkVulkanContext APIs and
the old Vulkan renderer have been removed.

Vulkan is now enabled by default, and Linux distributions should
build GTK with Vulkan support. This requires the glslc shader
compiler as a new dependency.

Vulkan is now also used for dmabuf support.

* GtkDropdown:
 - Fix display of initial selection

* GtkShortcutsWindow:
 - Make the window adapt to smaller screen widths

* GtkTextView:
 - Fix a possible NULL dereference in history

* GDK:
 - Make the png loader safer against overflows

* GL:
 - Fix some errors in handling of texture formats and mipmaps