Loading PDF shows a grey screen only

[vladimiry]

• Electron Version: v12.0.0-beta.25 (also tested different v12.0.0-beta versions - all affected)
• Operating System: Linux (not tested on other systems)
• Last Known Working Electron version: 11.2.3

Expected Behavior

The PDF content should be displayed.

Actual Behavior

Only the gray screen is displayed.

To Reproduce

Load any PDF file using browserWindowInstance.loadURL / browserWindowInstance.loadFile methods.

Main process code sample if needed:

const {app, BrowserWindow} = require("electron");

app.whenReady().then(() => {
  app.on("web-contents-created", (...[, webContents]) => {
    webContents.on("did-fail-load", (...[, errorCode, errorDescription, validatedURL, isMainFrame]) => {
      console.log({errorCode, errorDescription, validatedURL, isMainFrame});
    });
  });

  // loading via "loadURL" call also affected
  new BrowserWindow().loadFile("path-to-pdf-file.pdf");
});

Additional Information

Possibly similar to #22286. CC @nornagon.

[vladimiry]

The did-fail-load event setup this way:

app.on("web-contents-created", (...[, webContents]) => {
  webContents.on("did-fail-load", (...[/* event */, errorCode, errorDescription, validatedURL, isMainFrame]) => {
    console.log({errorCode, errorDescription, validatedURL, isMainFrame});
  });
});

Gets triggered with the following data:

{
  errorCode: -6,
  errorDescription: 'ERR_FILE_NOT_FOUND',
  validatedURL: 'chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/index.html',
  isMainFrame: true
}

[codebytere]

@vladimiry that should be #27499 - i'll see that it gets back to v12.x

[nornagon]

bisected to v12.0.0-nightly.20201026...v12.0.0-nightly.20201030, probably bf89237 is the cause.

[nornagon]

ah @codebytere already fixed this. Can we close this out now?