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Add folder switcher arrows back to the folder pane toolbar, with a preference to turn them off if desired.
The remaining functionality of the add-on, i.e., automatically switching to the "All Folders" view when you over over the toolbar while dragging a message, remains in effect in Thunderbird 48+.
On older versions of Thunderbird, the view-switching arrows functionality is retained.
Localize the install manifest so that the description of the add-on in the user interface will be translated (for the languages for which I have translations).
Add Simplified Chinese translation, thanks to yfdyh000 from BabelZilla.
Compatible up to thunderbird 15.0a1.
Disable the automatic revert to the original folder view whenever any new message is copied into any message folder while the drag is in progress. This is no longer necessary in the current architecture of the add-on.
Fix a bug which would cause the original folder view to be lost if the user moved his/her mouse into the folder view title area for long enough for the view to be switched automatically, then moved the mouse out of and back into the folder view title area.
This functional change is unfortunately necessary to work around some deficiencies in the drag & drop facilities provide by Thunderbird.