Don't eradicate state when I add a new option

plate-tool-eframe/src/app.rs

@@ -16,8 +16,10 @@ use crate::transfer_menu::{transfer_menu, CurrentTransferState, TransferMenuStat
 use crate::tree::tree;
 use crate::upper_menu;
 
+// Make sure all fields are either skipped by serde or impl default!
 #[non_exhaustive]
 #[derive(Debug, serde::Serialize, serde::Deserialize)]
+#[serde(default)]
 pub struct MainWindowState {
     pub show_side_panel: bool,
     pub plate_display_options: PlateDisplayOptions,

plate-tool-eframe/src/plate.rs

@@ -55,6 +55,7 @@ impl WellInfo {
 }
 
 #[derive(Clone, Copy, Debug, serde::Serialize, serde::Deserialize)]
+#[serde(default)]
 pub struct PlateDisplayOptions {
     pub show_transfer_hashes: bool,
     pub show_well_volumes: bool,