ngl: rendering issues on ARM Mali G72 / panfrost

Steps to reproduce

Start any GTK4 app

Current behavior

GTK4 apps have graphical glitches (GTK3 apps seem to be fine). Issues include:

• scrollable sidebar elements missing/blinking
• icons rendered over other icons in scrollable sidebars
• text rendering issues in scrollable sidebars
• hamburger menus / other title bar items missing/blinking

The issues disappear when forcing the gl or cairo renderer via the GSK_RENDERER environment variable.

Expected outcome

Normal rendering.

Version information

GTK4 version: 4.14.5
OS: NixOS unstable
Desktop environment: Phosh/Phoc (wayland/wlroots)
GPU driver: panfrost / mesa 24.2.2

Hardware:
Device: Lenovo IdeaPad Duet Chromebook (google-krane)
CPU: Mediatek MT8183
GPU: ARM Mali-G72 MP3

Additional information

For example, gnome-control-center: Debug output (GDK_DEBUG=opengl GSK_RENDERER=ngl gnome-control-center):

EGL API version 1.4 found
 - Vendor: Mesa Project
 - Version: 1.4
 - Device: /dev/dri/renderD128, 226 128
 - Client APIs: OpenGL OpenGL_ES 
 - Extensions:
	EGL_ANDROID_blob_cache
	EGL_ANDROID_native_fence_sync
	EGL_EXT_buffer_age
	EGL_EXT_config_select_group
	EGL_EXT_image_dma_buf_import
	EGL_EXT_image_dma_buf_import_modifiers
	EGL_EXT_pixel_format_float
	EGL_EXT_present_opaque
	EGL_EXT_surface_compression
	EGL_EXT_swap_buffers_with_damage
	EGL_KHR_cl_event2
	EGL_KHR_config_attribs
	EGL_KHR_context_flush_control
	EGL_KHR_create_context
	EGL_KHR_create_context_no_error
	EGL_KHR_fence_sync
	EGL_KHR_get_all_proc_addresses
	EGL_KHR_gl_colorspace
	EGL_KHR_gl_renderbuffer_image
	EGL_KHR_gl_texture_2D_image
	EGL_KHR_gl_texture_3D_image
	EGL_KHR_gl_texture_cubemap_image
	EGL_KHR_image_base
	EGL_KHR_no_config_context
	EGL_KHR_partial_update
	EGL_KHR_reusable_sync
	EGL_KHR_surfaceless_context
	EGL_KHR_swap_buffers_with_damage
	EGL_KHR_wait_sync
	EGL_MESA_configless_context
	EGL_MESA_drm_image
	EGL_MESA_gl_interop
	EGL_MESA_image_dma_buf_export
	EGL_MESA_query_driver
	EGL_MESA_x11_native_visual_id
	EGL_WL_bind_wayland_display
	EGL_WL_create_wayland_buffer_from_image
 - Selected fbconfig: R8G8B8A8, depth 0, stencil 0
          high depth: R16G16B16A16 float, depth 0, stencil 0
Creating EGL context version 2.0 (debug:no, forward:no, legacy:no, es:yes)
Created EGL context[0xf5e15f0]
Using OpenGL backend EGL
OpenGL ES version: 3.1 (core)
* GLSL version: OpenGL ES GLSL ES 3.10
* Max texture size: 8192

Enabled features (use GDK_GL_DISABLE env var to disable):
    debug: YES
    unpack-subimage: YES
    half-float: YES
    sync: YES
    base-instance: YES
    buffer-storage: YES
Creating EGL context version 3.0 (debug:no, forward:no, legacy:no, es:yes)
Created EGL context[0xf6a94b0]
OpenGL ES version: 3.1 (core)
* GLSL version: OpenGL ES GLSL ES 3.10
* Max texture size: 8192

Enabled features (use GDK_GL_DISABLE env var to disable):
    debug: YES
    unpack-subimage: YES
    half-float: YES
    sync: YES
    base-instance: YES
    buffer-storage: YES
Using fractional scale 2 for EGL window (600 913 => 1200 1826)
Destroying EGL context