Part of #4936: custom dictionary and Ignore All commands

text.spelling.addWord, removeWord and changeWord are Check Spelling's Add
and Edit Custom Dictionary's Add, Delete and Change; text.spelling.dictionary
lists the words. They live in craft-proof, which every language's check
reads. The desktop app and vectorcraft-cli keep them in
`Custom Dictionary.txt` next to the preferences (none without preferences);
elsewhere they last until the app closes.

text.spelling.ignoreAll is Ignore All: the active document's checks skip the
word while it is open; not saved, not undoable, and not a change to the
document's revision.

Behaviour: https://helpx.adobe.com/illustrator/desktop/design-with-text/edit-format-text/check-and-correct-spelling.html

apps/vectorcraft-cli/src/main.rs

@@ -224,12 +224,14 @@ fn main() -> ExitCode {
 }
 
 /// A headless session that remembers what the user keeps between runs: the PDF presets saved, the
-/// ICC profiles loaded and the plug-ins installed (#2168, #2174, #2541), in the folders next to the preferences that the desktop
-/// app uses too. `VECTORCRAFT_NO_PREFS` and `VECTORCRAFT_CONFIG_DIR` apply as they do there.
+/// ICC profiles loaded, the plug-ins installed (#2168, #2174, #2541) and the custom dictionary's words (#4936), in the folders
+/// and files next to the preferences that the desktop app uses too. `VECTORCRAFT_NO_PREFS` and `VECTORCRAFT_CONFIG_DIR` apply
+/// as they do there.
 fn with_stores(mut h: Headless) -> Headless {
     prefs_dir::attach_profile_store(&mut h.session);
     prefs_dir::attach_plugin_store(&mut h.session);
     prefs_dir::attach_pdf_preset_store(&mut h.session);
+    prefs_dir::attach_custom_dictionary(&mut h.session);
     h
 }
 

apps/vectorcraft/src/main.rs

@@ -466,6 +466,8 @@ fn main() -> std::process::ExitCode {
                 // The saved PDF presets live in their own folder (also read by vectorcraft-cli),
                 // which takes over from the copy the preferences file used to hold.
                 prefs_dir::attach_pdf_preset_store(&mut app.session);
+                // The custom dictionary's words, kept in their own file next to the preferences.
+                prefs_dir::attach_custom_dictionary(&mut app.session);
                 // Fit the window to its monitor, or put it back where it was (still hidden).
                 let winit_window = cc.winit_window().cloned();
                 if let Some(w) = &winit_window {

apps/vectorcraft/src/prefs_dir.rs

@@ -57,6 +57,14 @@ pub fn attach_pdf_preset_store(session: &mut vectorcraft_engine::Session) {
     }
 }
 
+/// Keep the custom dictionary (Edit › Spelling › Add, Edit Custom Dictionary) in the
+/// `Custom Dictionary.txt` file next to the settings, one word per line, and take in its words.
+pub fn attach_custom_dictionary(session: &mut vectorcraft_engine::Session) {
+    if let Some(path) = store_dir("Custom Dictionary.txt") {
+        session.attach_custom_dictionary(path);
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;