Prompt user to save preset changes before they compute weights

Closes #2797

ftl/core/deck-config.ftl

@@ -388,7 +388,7 @@ deck-config-compute-optimal-retention-tooltip =
     if it significantly differs from 0.9, it's a sign that the time you've allocated each day is either too low
     or too high for the amount of cards you're trying to learn. This number can be useful as a reference, but it
     is not recommended to copy it into the desired retention field.
-
+deck-config-please-save-your-changes-first = Please save your changes first.
 deck-config-wait-for-audio = Wait for audio
 deck-config-show-reminder = Show Reminder
 deck-config-answer-again = Answer Again

ts/deck-options/FsrsOptions.svelte

@@ -63,6 +63,10 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
             await setWantsAbort({});
             return;
         }
+        if (state.presetAssignmentsChanged()) {
+            alert(tr.deckConfigPleaseSaveYourChangesFirst());
+            return;
+        }
         computingWeights = true;
         try {
             await runWithBackendProgress(
@@ -97,6 +101,10 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
             await setWantsAbort({});
             return;
         }
+        if (state.presetAssignmentsChanged()) {
+            alert(tr.deckConfigPleaseSaveYourChangesFirst());
+            return;
+        }
         checkingWeights = true;
         try {
             await runWithBackendProgress(
@@ -137,6 +145,10 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
             await setWantsAbort({});
             return;
         }
+        if (state.presetAssignmentsChanged()) {
+            alert(tr.deckConfigPleaseSaveYourChangesFirst());
+            return;
+        }
         computingRetention = true;
         try {
             await runWithBackendProgress(

ts/deck-options/lib.ts

@@ -51,6 +51,7 @@ export class DeckOptionsState {
     private modifiedConfigs: Set<DeckOptionsId> = new Set();
     private removedConfigs: DeckOptionsId[] = [];
     private schemaModified: boolean;
+    private _presetAssignmentsChanged = false;
 
     constructor(targetDeckId: DeckOptionsId, data: DeckConfigsForUpdate) {
         this.targetDeckId = targetDeckId;
@@ -98,6 +99,7 @@ export class DeckOptionsState {
 
     setCurrentIndex(index: number): void {
         this.selectedIdx = index;
+        this._presetAssignmentsChanged = true;
         this.updateCurrentConfig();
         // use counts have changed
         this.updateConfigList();
@@ -142,6 +144,7 @@ export class DeckOptionsState {
         const configWithCount = { config, useCount: 0 };
         this.configs.push(configWithCount);
         this.selectedIdx = this.configs.length - 1;
+        this._presetAssignmentsChanged = true;
         this.sortConfigs();
         this.updateCurrentConfig();
         this.updateConfigList();
@@ -167,6 +170,7 @@ export class DeckOptionsState {
         }
         this.configs.splice(this.selectedIdx, 1);
         this.selectedIdx = Math.max(0, this.selectedIdx - 1);
+        this._presetAssignmentsChanged = true;
         this.updateCurrentConfig();
         this.updateConfigList();
     }
@@ -199,6 +203,10 @@ export class DeckOptionsState {
         };
     }
 
+    presetAssignmentsChanged(): boolean {
+        return this._presetAssignmentsChanged;
+    }
+
     async save(applyToChildren: boolean): Promise<void> {
         await updateDeckConfigs(
             this.dataForSaving(applyToChildren),