[Bug 1762588] Re: thunderbird 52.6.0/18.04 beta compact folder broken

[gf]

Hi Nataraj,
For the ease of the programmers, I will add a summery here to complete the bug report. Please feel free to add any corrections. 
Also, do you mind if I update the title of the bug report to:
“thunderbird 52.9.1/18.04 compact folder broken for IMAP Dovecot”
Thanks
G
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SUMMARY:
Ubuntu version: Ubuntu 18.04
thunderbird 1:52.9.1+build3-0ubuntu0.18.04.1
dovecot-1.0.7-9.el5_11.4
Problem is reproducable by the reporter.

Steps to reproduce:
1. In Ubuntu 18.04
2. In Thunderbird, in account connected to an IMAP server running Dovecot
2. right click on one folder in the folder list
3. no option available to compact the folder

4. In Ubuntu 14.04
5. In Thunderbird, in account connected to an IMAP server running Dovecot
6. right click on one folder in the folder list
7. compact folder option is available

Actual behaviour: compact folder option missing in Ubuntu 18.04 in same
version of Thunderbird.

Expected behaviour: compact folder option should be available for
folders.

Additional notes: 
Only occurs with an IMAP server running Dovecot. Issue not evident on Gmail IMAP.

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https://bugs.launchpad.net/bugs/1762588

Title:
   thunderbird 52.6.0/18.04 beta compact folder broken

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