To run it, get a recent version of Rust and GTK4 and run:
cargo run --release
Zooming can be done with the first mouse button, moving around with the second mouse button.
For building the application with meson, the following PRs, that were not merged yet at the time of writing, are needed:
# Building
meson _builddir
ninja -C _builddir
# Running uninstalled
_builddir/mandelbrot
# Installing
ninja -C _builddir install