Version 43.rc
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Take advantage of some newer GLib/GObject features, with a corresponding 
dependency bump, to simplify some code.

Thanks to Maximiliano we now store the size of the last window, and use it
for future windows rather than unconditionally using 80×24.

A bug in 43.beta where ‘Show in Files’ was mistakenly unavailable has been
fixed, as well as a longstanding edge case when a background tab closes.

Updated Translations:
 * Catalan  (Jordi Mas)
 * Chinese (China)  (Luming Zh)
 * Croatian  (Goran Vidović)
 * Danish  (Ask Hjorth Larsen)
 * Dutch  (Nathan Follens)
 * French  (Irénée THIRION)
 * Galician  (Fran Dieguez)
 * Hebrew  (Yosef Or Boczko)
 * Hungarian  (Balázs Úr)
 * Indonesian  (Kukuh Syafaat)
 * Occitan  (Quentin PAGÈS)
 * Polish  (Piotr Drąg)
 * Spanish  (Daniel Mustieles)
 * Turkish  (Emin Tufan Çetin)