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Show drag & drop feedback dropping message on folder

Closes #422

See merge request !696

Fixes regression resulting from !401

build: Update for 40.rc

See merge request !695

flatpak: Don't drop the libhandy VAPI

See merge request !694

ui: Homogeneize the panels

See merge request !689

This avoids prematurely cleaning /share for libhandy, which would drop
its VAPI and hence make Geary not build.

This makes the right panel take 50% of the window when it is wide
enough, and make the two other panels share the remaining 50%.

ui: Use saner pane size defaults

See merge request !693

Responsive layout fixes

See merge request !692

Related: #1164

The former takes into account GTK settings, the latter doesn't.

See libhandy#179

Don't need to load more when the conversation list is not being shown.

Duplicate, don't re-parent, conversation actions as responsive layout changes.

Closes #1193

See merge request !691

Needed to fix a conversation header bar spacing issue.

See libhandy#431

Both leaflets are unfolded by default, and fold down if the window is
too small, hence the conversation list's and viewer's action bar
revealers must be hidden by default to match,

Move the other buttons to the actionbar is the window is too narrow.

Make them look a bit more like action bars by giving them a top border.

The conversation viewer's actions are only needed when the main
toolbar's compact actions are being shown.

Make them a bit easier to reason about.

Convert Components.ConversationActions to a widget that encapsulates
selectively visible conversations action groups. Use multiple instances
of that in preference to a single shared instance that gets re-parented
as the responsive UI adjusts.

Flatten the custom widget hierarchy a bit by merging the
`ConversationActionBar` and `ConversationHeaderbar` widgets into
`MainToolbar` itself.

Folder list fixes

Closes #1177 and #1184

See merge request !686

This undoes the expander-related changes introduced in !618, to fix
regressions such as #1177 and #1184.