Make QuickFolders compatible with Thunderbird 78 ESR

[RealRaven2000]

This issue is specifically for handling all compatibility problems in Thunderbird 70. Feel free to add more bugs specific to this version below.

• when right-clicking a tab, its label is removed

[RealRaven2000]

Here is a quick-fix for the "removed label" problem; this was caused by some faulty tidy up of old menus in the function addPopupSet:

    if (button.firstChild)
      button.removeChild(button.firstChild);

I have fixed this by adding && tagname == "menupopup" to the conditional
QuickFolders-min-4.17pre27.zip

[RealRaven2000]

Another regression: the search box of the quickMove panel doesn't work. I replaced the (deprecated) textbox with a search-textbox element - for this, I had to split out the tool panel into a separate XUL file. There is still a new issue with loading the reading list which is caused by this fix. test version:

QuickFolders-wx-4.17pre41.zip

[RealRaven2000]

When moving files with quickMove, there is an exception that fails querying the folders ti the nsIRDFResource interface. I was able to remove the references, so the quickMove function works again - fixed version, tested in 72.0a1 Daily (2019-111-01):

QuickFolders-wx-4.17pre43.zip

[RealRaven2000]

I created the new branch ESR78 and have started the conversion process, for real. I estimate about 3-5 weeks.

[RealRaven2000]

Just updated manifest,json so that QF actually installs (in Tb78 b4)
Obviously I need to convert the options file, but this is an encouraging start:

[RealRaven2000]

Timeline: we intend to be ready by end of September, when 78.2 is auto-rolled out to the Tb68 users base. Please do not upgrade until then.

What happened - @jobisoft helped me and @opto with the first hard conversion step to a mail experiment with QuickFolders. We will finish that one first so that it runs completely with only minor functionality loss. Then we will apply the same changes to quickFilters (similar codebase) and last SmartTemplate⁴.

[RealRaven2000]

I had to abandon branch ESR78 because it was too chaotic. Created a new branch here:

ESR78-method

and now following John Bieling's update guide, here:
https://github.com/thundernest/addon-developer-support/wiki/Using-the-WindowListener-API-to-convert-a-Legacy-Overlay-WebExtension-into-a-MailExtension-for-Thunderbird-78

[PotatoCarl]

Would be happy to beta-test for Thunderbird 78.

[RBZS1947]

I too would be happy to beta-test for TB78.

[RealRaven2000]

I just had some design meeting, and here are some previews for the toolbars:

Current Folder ("Navigation") toolbar:

New icons for main toolbar: (Toolbar toggle, create new folder, skip folder)

they will of course have "focus colors" to make them even easier to use: