feat(core,fuse,gui): Proton theme, photos on the map and an opt-in street map

- The Proton accent preference becomes a whole Proton theme that also
  holds against a GTK theme imported from gtk.css; folders get Proton's
  purple folder icon while it is on.
- Places map markers show one of each town's photos with a count, and
  zoomed in on a town every photo sits where it was taken
  (Request::PlaceLocations). Photos taken on one spot are listed in a
  popover. "Show on map" in the photo viewer goes to the Places map.
- The built-in map draws country borders, sea and land in their own
  colours.
- An opt-in street map from OpenFreeMap (vector tiles drawn with cairo,
  cached on disk up to 256 MB), with the OpenStreetMap credit on the map
  and in About.
- Translations for all catalogs; changelog folded into 2.3.0.

crates/pdfs-core/src/config.rs

@@ -128,11 +128,12 @@ pub struct AppConfig {
     /// field.
     #[serde(default)]
     pub prompt: Option<PromptConfig>,
-    /// Paint the desktop app in Proton purple instead of the system accent
-    /// colour. `None` means "follow the system". Defaulted for configs
-    /// predating the field.
-    #[serde(default)]
-    pub proton_accent: Option<bool>,
+    /// Paint the desktop app in Proton's colours instead of the system theme
+    /// and accent colour. `None` means "follow the system". Defaulted for
+    /// configs predating the field; also read from `proton_accent`, its name
+    /// while it only changed the accent.
+    #[serde(default, alias = "proton_accent")]
+    pub proton_theme: Option<bool>,
     /// How the desktop app's My Files page lays out and orders a folder.
     /// Defaulted for configs predating the field.
     #[serde(default)]
@@ -147,6 +148,12 @@ pub struct AppConfig {
     /// Defaulted for configs predating the field.
     #[serde(default)]
     pub language: Option<String>,
+    /// Draw the Places map from OpenFreeMap's street map instead of the
+    /// built-in outline. Off by default: the tiles come from a third party,
+    /// which then learns which parts of the world are looked at. Defaulted for
+    /// configs predating the field.
+    #[serde(default)]
+    pub online_map: bool,
 }
 
 /// The My Files page's view choices, remembered between runs.
@@ -216,10 +223,11 @@ impl Default for AppConfig {
             conflict_sweep: None,
             open_with: None,
             prompt: None,
-            proton_accent: None,
+            proton_theme: None,
             files_view: FilesView::default(),
             tray_hidden: false,
             language: None,
+            online_map: false,
         }
     }
 }
@@ -566,7 +574,7 @@ mod tests {
             conflict_sweep: Some(SweepMode::Enforce),
             open_with: None,
             prompt: None,
-            proton_accent: Some(true),
+            proton_theme: Some(true),
             files_view: FilesView {
                 list: true,
                 sort: FileSort::Modified,
@@ -575,13 +583,15 @@ mod tests {
             },
             tray_hidden: true,
             language: Some("de".to_string()),
+            online_map: true,
         };
         let json = serde_json::to_string(&config).unwrap();
         let decoded: AppConfig = serde_json::from_str(&json).unwrap();
         assert_eq!(decoded.app_version, "external-drive-test-client@1.0.0");
         assert_eq!(decoded.user_agent, "test-agent/1.0");
-        assert_eq!(decoded.proton_accent, Some(true));
+        assert_eq!(decoded.proton_theme, Some(true));
         assert!(decoded.tray_hidden);
+        assert!(decoded.online_map);
         assert_eq!(decoded.language.as_deref(), Some("de"));
         assert_eq!(decoded.upload_limit, Some(500_000));
         assert_eq!(decoded.download_limit, None);
@@ -598,6 +608,14 @@ mod tests {
         assert!(partial.folders_first);
     }
 
+    #[test]
+    fn the_old_proton_accent_setting_turns_on_the_proton_theme() {
+        let decoded: AppConfig =
+            serde_json::from_str(r#"{"app_version":"a","user_agent":"b","proton_accent":true}"#)
+                .unwrap();
+        assert_eq!(decoded.proton_theme, Some(true));
+    }
+
     #[test]
     fn test_default_app_config() {
         let default_config = AppConfig::default();

crates/pdfs-core/src/control.rs

@@ -103,6 +103,9 @@ pub enum Request {
         offset: usize,
         limit: usize,
     },
+    /// Every photo taken in one town with where exactly it was taken, for the
+    /// map's close-up. Replies with [`Response::PhotoLocations`].
+    PlaceLocations { id: u32 },
     /// List the account's photo albums, newest activity first, including the
     /// albums other people share with us. Metadata only — an album's cover
     /// thumbnail is fetched with [`Request::PhotoThumbs`] like any other photo.
@@ -1468,6 +1471,15 @@ pub struct PlaceInfo {
     pub cover: PhotoItem,
 }
 
+/// One photo and where it was taken, in decimal degrees. Part of
+/// [`Response::PhotoLocations`].
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct PhotoLocation {
+    pub photo: PhotoItem,
+    pub latitude: f64,
+    pub longitude: f64,
+}
+
 /// How many of the timeline's photos a running refresh has read the metadata
 /// (and so the location) of, out of how many. Part of [`Response::Places`].
 #[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq)]
@@ -1845,6 +1857,9 @@ pub enum Response {
         #[serde(default)]
         mapping: Option<MappingProgress>,
     },
+    /// The photos of one town, each with its location (reply to
+    /// [`Request::PlaceLocations`]).
+    PhotoLocations { items: Vec<PhotoLocation> },
     /// Thumbnails for a [`Request::PhotoThumbs`] batch.
     Thumbs { items: Vec<PhotoThumb> },
     /// Per-node outcome of a [`Request::TrashNodes`] batch. Reported per uid
@@ -2549,6 +2564,7 @@ mod tests {
                 offset: 60,
                 limit: 30,
             },
+            Request::PlaceLocations { id: 2950159 },
         ] {
             let line = serde_json::to_string(&req).unwrap();
             let back: Request = serde_json::from_str(&line).unwrap();

crates/pdfs-core/src/db/photos.rs

@@ -697,6 +697,29 @@ impl Db {
         Ok(rows)
     }
 
+    /// Every photo taken in a town, one per group as in [`Self::photos_at_place`],
+    /// with where exactly it was taken. A group's own location is that of the
+    /// photo standing for it.
+    pub fn photo_locations_at_place(&self, id: u32) -> Result<Vec<(StoredPhoto, (f64, f64))>> {
+        let photos = self.photos_at_place(id, 0, usize::MAX >> 1)?;
+        let located: HashMap<String, (f64, f64)> = {
+            let conn = self.read();
+            let mut stmt = conn.prepare(
+                "SELECT uid, latitude, longitude FROM photos \
+                 WHERE place_id = ?1 AND latitude IS NOT NULL AND longitude IS NOT NULL",
+            )?;
+            stmt.query_map(params![id], |r| Ok((r.get(0)?, (r.get(1)?, r.get(2)?))))?
+                .collect::<rusqlite::Result<_>>()?
+        };
+        Ok(photos
+            .into_iter()
+            .filter_map(|photo| {
+                let at = *located.get(&photo.uid)?;
+                Some((photo, at))
+            })
+            .collect())
+    }
+
     /// Sets of photos with the same content hash, each set ordered with the
     /// copy worth keeping first, and the sets newest first.
     ///

crates/pdfs-core/src/db/tests.rs

@@ -339,6 +339,30 @@ fn places_group_photos_by_the_nearest_town() {
     assert_eq!(berlin, ["b2", "b1-jpeg"]);
 }
 
+/// A town's photos come with where each was taken, one per RAW+JPEG shot.
+#[test]
+fn place_photos_carry_their_own_location() {
+    let db = Db::open_in_memory().unwrap();
+    let kreuzberg = (52.497, 13.411);
+    db.photos_replace(&[
+        located("b2", 500, "IMG_5.JPG", BERLIN),
+        located("b1-jpeg", 300, "IMG_3.JPG", kreuzberg),
+        located("b1-raw", 300, "IMG_3.CR2", kreuzberg),
+    ])
+    .unwrap();
+    let id = db.photo_places().unwrap()[0].id;
+    let located: Vec<(String, (f64, f64))> = db
+        .photo_locations_at_place(id)
+        .unwrap()
+        .into_iter()
+        .map(|(photo, at)| (photo.uid, at))
+        .collect();
+    assert_eq!(
+        located,
+        [("b2".to_owned(), BERLIN), ("b1-jpeg".to_owned(), kreuzberg)]
+    );
+}
+
 /// A refresh that skips an already-resolved photo keeps where it was taken; one
 /// that reads the node again takes what the node now says.
 #[test]