fix: force the gtk renderer to be gl for now (#1132)

should fix various reported crashes related to the new 'ngl' renderer introduced in gtk4.14.

addresses #1061

crates/rnote-ui/src/env.rs

@@ -63,6 +63,9 @@ pub(crate) fn locale_dir() -> anyhow::Result<PathBuf> {
 
 /// depending on the target platform we need to set some env vars on startup
 pub(crate) fn setup_env() -> anyhow::Result<()> {
+    // workaround for issue 1061 https://github.com/flxzt/rnote/issues/1061
+    std::env::set_var("GSK_RENDERER", "gl");
+
     if cfg!(target_os = "windows") {
         let data_dir = data_dir()?;
         let lib_dir = lib_dir()?;