Change window title in Movie Maker mode to display useful information

The frame number and movie time is now displayed in the window
title. This way, you can see how quickly the video recording is advancing
in real-time (and perhaps tweak your settings if it's going too slow).

servers/movie_writer/movie_writer.cpp

@@ -30,6 +30,8 @@
 
 #include "movie_writer.h"
 #include "core/config/project_settings.h"
+#include "core/io/dir_access.h"
+#include "servers/display_server.h"
 
 MovieWriter *MovieWriter::writers[MovieWriter::MAX_WRITERS];
 uint32_t MovieWriter::writer_count = 0;
@@ -101,6 +103,7 @@ void MovieWriter::get_supported_extensions(List<String> *r_extensions) const {
 }
 
 void MovieWriter::begin(const Size2i &p_movie_size, uint32_t p_fps, const String &p_base_path) {
+	project_name = GLOBAL_GET("application/config/name");
 	mix_rate = get_audio_mix_rate();
 	AudioDriverDummy::get_dummy_singleton()->set_mix_rate(mix_rate);
 	AudioDriverDummy::get_dummy_singleton()->set_speaker_mode(AudioDriver::SpeakerMode(get_audio_speaker_mode()));
@@ -162,6 +165,18 @@ void MovieWriter::set_extensions_hint() {
 }
 
 void MovieWriter::add_frame(const Ref<Image> &p_image) {
+	const int movie_time_seconds = Engine::get_singleton()->get_frames_drawn() / fps;
+	const String movie_time = vformat("%s:%s:%s",
+			String::num(movie_time_seconds / 3600).pad_zeros(2),
+			String::num((movie_time_seconds % 3600) / 60).pad_zeros(2),
+			String::num(movie_time_seconds % 60).pad_zeros(2));
+
+#ifdef DEBUG_ENABLED
+	DisplayServer::get_singleton()->window_set_title(vformat("MovieWriter: Frame %d (time: %s) - %s (DEBUG)", Engine::get_singleton()->get_frames_drawn(), movie_time, project_name));
+#else
+	DisplayServer::get_singleton()->window_set_title(vformat("MovieWriter: Frame %d (time: %s) - %s", Engine::get_singleton()->get_frames_drawn(), movie_time, project_name));
+#endif
+
 	AudioDriverDummy::get_dummy_singleton()->mix_audio(mix_rate / fps, audio_mix_buffer.ptr());
 	write_frame(p_image, audio_mix_buffer.ptr());
 }

servers/movie_writer/movie_writer.h

@@ -42,6 +42,8 @@ class MovieWriter : public Object {
 	uint64_t mix_rate = 0;
 	uint32_t audio_channels = 0;
 
+	String project_name;
+
 	LocalVector<int32_t> audio_mix_buffer;
 
 	enum {