feat(translate): keep translated subtitles next to the video so they load on reopen (#14)

Co-authored-by: Tri Vo Khac <git@trivk.dev>

src/qml/Main.qml

@@ -24,7 +24,6 @@ ApplicationWindow {
     // subtitle even while that translated track is selected in mpv.
     property var lastTranslationTrack: null
     property url lastTranslationVideo: ""
-    property var translatedSubtitleUrls: []
 
     function openFile(url: url) {
         playlistModel.openFile(url, QtPotatoSettings.playlistLoadSiblings)
@@ -46,10 +45,15 @@ ApplicationWindow {
         }
     }
 
+    function translatedTrackTitle(): string {
+        return KI18n.i18nc("@item:inlistbox subtitle track, %1 is a language", "%1 (translated)", QtPotatoSettings.targetLanguage)
+    }
+
     function translateCurrentSubtitle() {
         let track = video.subtitleTracks.find(track => track.id === video.subtitleId)
-        if (track && translatedSubtitleUrls.includes(track.externalFilename) && lastTranslationTrack) {
-            track = video.subtitleTracks.find(track => track.id === lastTranslationTrack.id)
+        // Translate the original again, not the translation on screen.
+        if (track && video.isTranslatedSubtitle(track.id)) {
+            track = lastTranslationTrack ? video.subtitleTracks.find(track => track.id === lastTranslationTrack.id) : null
         }
         // No subtitle shown, or a picture-based one: translate the best text subtitle.
         if (!track || track.bitmap) {
@@ -141,7 +145,8 @@ ApplicationWindow {
     PlaylistModel {
         id: playlistModel
         onPlayRequested: url => {
-            video.loadFile(url)
+            // A translation made earlier is loaded and turned on with the file.
+            video.loadFile(url, translationService.savedTranslation(url), appWindow.translatedTrackTitle())
             RecentFilesModel.add(url)
         }
     }
@@ -169,10 +174,7 @@ ApplicationWindow {
     TranslationService {
         id: translationService
         onTranslated: (subtitleUrl, fromCache) => {
-            // mpv exposes local external subtitle filenames as filesystem paths.
-            appWindow.translatedSubtitleUrls.push(decodeURIComponent(subtitleUrl.toString().replace(/^file:\/\//, "")))
-            video.showTranslatedSubtitleFile(subtitleUrl,
-                KI18n.i18nc("@item:inlistbox subtitle track, %1 is a language", "%1 (translated)", QtPotatoSettings.targetLanguage))
+            video.showTranslatedSubtitleFile(subtitleUrl, appWindow.translatedTrackTitle())
             osdItem.message(fromCache
                 ? KI18n.i18nc("@info:osd", "Loaded the saved translation")
                 : KI18n.i18nc("@info:osd", "Translation ready"))
@@ -187,7 +189,6 @@ ApplicationWindow {
             translationService.forgetTranslation()
             appWindow.lastTranslationTrack = null
             appWindow.lastTranslationVideo = ""
-            appWindow.translatedSubtitleUrls = []
             glossaryDialog.close()
         }