feat(core): add error message on `error::CreateWebview` (#1602)

.changes/create-webview-error.md

@@ -0,0 +1,5 @@
+---
+"tauri": patch
+---
+
+`tauri::error::CreateWebview` now has the error string message attached.

core/tauri/src/error.rs

@@ -8,8 +8,8 @@ use std::path::PathBuf;
 #[derive(Debug, thiserror::Error)]
 pub enum Error {
   /// Failed to create webview.
-  #[error("failed to create webview")]
-  CreateWebview,
+  #[error("failed to create webview: {0}")]
+  CreateWebview(String),
   /// Failed to create window.
   #[error("failed to create window")]
   CreateWindow,

core/tauri/src/runtime/flavors/wry.rs

@@ -292,7 +292,7 @@ impl Dispatch for WryDispatcher {
         custom_protocols.into_iter().map(|(_, p)| p).collect(),
         file_drop_handler,
       )
-      .map_err(|_| crate::Error::CreateWebview)?;
+      .map_err(|e| crate::Error::CreateWebview(e.to_string()))?;
 
     let dispatcher = WryDispatcher {
       window,
@@ -466,7 +466,7 @@ impl Runtime for Wry {
   type Dispatcher = WryDispatcher;
 
   fn new() -> crate::Result<Self> {
-    let app = wry::Application::new().map_err(|_| crate::Error::CreateWebview)?;
+    let app = wry::Application::new().map_err(|e| crate::Error::CreateWebview(e.to_string()))?;
     Ok(Self { inner: app })
   }
 
@@ -506,7 +506,7 @@ impl Runtime for Wry {
         custom_protocols.into_iter().map(|(_, p)| p).collect(),
         file_drop_handler,
       )
-      .map_err(|_| crate::Error::CreateWebview)?;
+      .map_err(|e| crate::Error::CreateWebview(e.to_string()))?;
 
     let dispatcher = WryDispatcher {
       window,