Linux/Centos7 Zulip App 3.0.0
The spellcheck module does not underline words on Centos7. Possibly related to #662 , but I figured I'd open a separate ticket for this issue.
Centos:

webapp on centos:

@swallitsch can you please tell us, what is your Default language(setting->display setting->Default language) it's because the spellchecker language now automatically enable for default language
Zulip Preferences: English
Centos 7 language set to English (United States)
Spellchecker is on in the app settings
@swallitsch thanks for reporting the issue. I'm using Ubuntu, not CentOS, but the spellchecker takes some time to kick in for me as compared to Windows/macOS. Does this issue persist after a while/typing erratically in the text box?
(Sorry if this seems like a silly question, just doing a sanity check)
No matter how long I wait, spellchecker never underlines anything. I've left misspelled words up for a few hours before.
If I expand the AppImage, are there a few choice files I can add some logging to to see why spellchecker isn't initializing?
@swallitsch does the right-click context menus works for you?

@akashnimare negative, which is why #662 was the first ticket I filed. I opened this up later as we're not getting the red underlines either.
Merging this into #662 as both are connected.
Most helpful comment
Zulip Preferences: English
Centos 7 language set to English (United States)
Spellchecker is on in the app settings