Brave-browser: [Desktop] Search Engines added by Extensions unavailable in Private Window

[ppittle]

Description

Search Engines added by Extensions can't be referenced by _Keyword_ + Tab in Private Window

Given the user has installed an Extension which adds a Search Engine
And the user has modified the Extension so that "Allow in private" is true.

Given the user is in a Private Window
And the Address Bar has Focus
When the user types the Extension's Search Keyword and presses Tab

Then further input is directed to the Extension's Search Engine

Scenario fails for Private Window:

Works with a 'normal' Window:

Steps to Reproduce

1. Install an Extension that Provides a Search Engine. I used LastPass

brave://settings/searchEngines

1. Ensure the Extension is available in Private

brave://extensions/?id=hdokiejnpimakedhajhdlcegeplioahd

1. Open a new Private Window
2. Focus the Address Bar
3. Type the Extension's Search Engine Keyword and press Tab. (In the case of LastPass, it's lp)

Actual result:

Tab Cycles through the History list that appears in the Address bar. Control is not routed to the Extension's Search Engine.

Expected result:

Private Window should behave as a 'normal' Window does. Input should be routed to the Extension's Search Engine

Reproduces how often:

Always reproduces

Brave version (brave://version info)

Brave | 1.10.97 Chromium: 83.0.4103.116 (Official Build) (64-bit)
-- | --
Revision | 8f0c18b4dca9b6699eb629be0f51810c24fb6428-refs/branch-heads/4103@{#716}
OS | Windows 10 OS Version 1909 (Build 18363.900)

Version/Channel Information:

• Can you reproduce this issue with the current release? YES
• Can you reproduce this issue with the beta channel?
• Can you reproduce this issue with the dev channel?
• Can you reproduce this issue with the nightly channel?

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NO
• Does the issue resolve itself when disabling Brave Rewards? NO
• Is the issue reproducible on the latest version of Chrome? NO

Miscellaneous Information:

[atahabaki]

Hi!..

I'm facing that too...

I've developed a Chrome extension which uses Chromium's Omnibox API for quickly search anything, anywhere. Then uploaded it to Chrome web store which I called it "smartbox: Smart Searching".

If you're interested in, you can take a look at here.

It works pretty well with Google Chrome (works on incognito mode too). On Brave, it is not working.

Please fix this issue. Maybe this is not an issue but. Make an exception for this to work on both private and Tor sessions too.

Have a great day.

[bsclifton]

Related (or possible duplicate of) https://github.com/brave/brave-browser/issues/10549

[ppittle]

Agree this and #10549 appear to be the same root issue. But I will point out, mine has more pictures :D