File tree stuff (#3679)

* Fix and test file tree operations

* fmt

Signed-off-by: Jess Frazelle <github@jessfraz.com>

* Make tsc happy

* I've been lied to

* Fix navigating to deleted file

* tsc

* Remove debugger statement

* Fix test

* All tests fixed

* Remove old config and remove slowmo

* fmt

* Remove unintentional changelog in readme (#3678)

* lint

* fmt

* Increase test timeout

* Fix the damn test

* fix web app

* fmt

---------

Signed-off-by: Jess Frazelle <github@jessfraz.com>
Co-authored-by: Jess Frazelle <github@jessfraz.com>
Co-authored-by: Jonathan Tran <jonnytran@gmail.com>
Co-authored-by: Kurt Hutten Irev-Dev <k.hutten@protonmail.ch>

src/lib/routeLoaders.ts

@@ -90,12 +90,24 @@ export const fileLoader: LoaderFunction = async (
     let code = ''
 
     if (!urlObj.pathname.endsWith('/settings')) {
-      if (!currentFileName || !currentFilePath || !projectName) {
+      const fallbackFile = isDesktop()
+        ? (await getProjectInfo(projectPath)).default_file
+        : ''
+      let fileExists = isDesktop()
+      if (currentFilePath && fileExists) {
+        try {
+          await window.electron.stat(currentFilePath)
+        } catch (e) {
+          if (e === 'ENOENT') {
+            fileExists = false
+          }
+        }
+      }
+
+      if (!fileExists || !currentFileName || !currentFilePath || !projectName) {
         return redirect(
           `${PATHS.FILE}/${encodeURIComponent(
-            isDesktop()
-              ? (await getProjectInfo(projectPath)).default_file
-              : params.id + '/' + PROJECT_ENTRYPOINT
+            isDesktop() ? fallbackFile : params.id + '/' + PROJECT_ENTRYPOINT
           )}`
         )
       }