fix(config): preserve preset saves from other sessions

Cargo.toml

@@ -21,6 +21,7 @@ serde_json = "1.0"
 tokio = { version = "1.39", features = ["rt-multi-thread", "macros", "time"] }
 async-trait = "0.1"
 pulldown-cmark = "0.12"
+tempfile = "3.27"
 
 # The profile that 'dist' will build with
 [profile.dist]

FEATURES.md

@@ -100,4 +100,5 @@ See the [feature demo](DEMO.md) for a visual walkthrough of these capabilities i
 - Scrollable help overlay with keyboard and mouse wheel controls; input stays in help until it is dismissed
 - Configurable keybindings via `~/.config/blippy/keybinds.toml`
 - Configurable close-comment presets in `~/.config/blippy/config.toml`
+- Preset saves retain presets and configuration changes saved by other sessions
 - Failed preset saves keep the editor and draft open so the write can be retried

README.md

@@ -86,6 +86,8 @@ See [FEATURES.md](FEATURES.md) for a full feature breakdown.
 
 Bindings in `keybinds.toml` override `[keybinds]` in `config.toml`. Saving comment presets preserves each file's bindings, so removing an override restores the binding from the main config.
 
+Saving a preset also keeps presets, themes, and bindings saved by other sessions since this session started. Failed writes leave the previous configuration intact so saving can be retried.
+
 Theme example:
 
 ```toml

src/app/state.rs

@@ -282,11 +282,7 @@ impl App {
     }
 
     pub fn save_comment_default(&mut self, preset: CommentDefault) -> Result<()> {
-        self.config.comment_defaults.push(preset);
-        if let Err(error) = self.config.save() {
-            self.config.comment_defaults.pop();
-            return Err(error);
-        }
+        self.config.save_comment_default(preset)?;
         self.preset.choice = 0;
         Ok(())
     }