tests/tweet_length: Add real-life test case

Shows that the link parsing is currently broken.
Merge branch 'main-widget' of https://github.com/baedert/corebird into main-widget
Revert "move SettingsDialog to GtkDialog"

This reverts commit 1418068becb1efb3fd91d1469255362588f783f4.

Conflicts:
	src/window/SettingsDialog.vala
	ui/settings-dialog.ui
AccountListEntry: Connect to the correct signal
SettingsDialog: Remove unnecessary code
app: Fix transient dialogs