Don't show diff view on slides if no change recos exist

client/src/app/core/repositories/motions/motion-repository.service.ts

@@ -1186,4 +1186,40 @@ export class MotionRepositoryService extends BaseIsAgendaItemAndListOfSpeakersCo
             }).length > 0
         );
     }
+
+    /**
+     * Tries to determine the realistic CR-Mode from a given CR mode
+     */
+    public determineCrMode(
+        mode: ChangeRecoMode,
+        hasChangingObjects: boolean,
+        isModifiedFinalVersion: boolean,
+        isParagraphBasedAmendment: boolean,
+        hasChangeRecommendations: boolean
+    ): ChangeRecoMode {
+        if (mode === ChangeRecoMode.Final) {
+            if (isModifiedFinalVersion) {
+                return ChangeRecoMode.ModifiedFinal;
+                /**
+                 * Because without change recos you cannot escape the final version anymore
+                 */
+            } else if (!hasChangingObjects) {
+                return ChangeRecoMode.Original;
+            }
+        } else if (mode === ChangeRecoMode.Changed && !hasChangingObjects) {
+            /**
+             * Because without change recos you cannot escape the changed version view
+             * You will not be able to automatically change to the Changed view after creating
+             * a change reco. The autoupdate has to come "after" this routine
+             */
+            return ChangeRecoMode.Original;
+        } else if (mode === ChangeRecoMode.Diff && !hasChangeRecommendations && isParagraphBasedAmendment) {
+            /**
+             * The Diff view for paragraph-based amendments is only relevant for change recommendations;
+             * the regular amendment changes are shown in the "original" view.
+             */
+            return ChangeRecoMode.Original;
+        }
+        return mode;
+    }
 }

client/src/app/site/motions/modules/motion-detail/components/motion-detail/motion-detail.component.ts

@@ -643,7 +643,13 @@ export class MotionDetailComponent extends BaseViewComponentDirective implements
     }
 
     private resetCrMode(): void {
-        this.crMode = this.determineCrMode(this.defaultCrMode);
+        this.crMode = this.repo.determineCrMode(
+            this.defaultCrMode,
+            this.hasChangingObjects(),
+            !!this.motion?.modified_final_version,
+            this.motion?.isParagraphBasedAmendment(),
+            this.changeRecommendations?.length > 0
+        );
     }
 
     /**
@@ -720,7 +726,13 @@ export class MotionDetailComponent extends BaseViewComponentDirective implements
         // first in this case (in the config-listener) and perform the actual check if "diff" is possible now.
         // Test: "diff" as default view. Open a motion, create an amendment. "Original" should be set automatically.
         if (this.crMode) {
-            this.crMode = this.determineCrMode(this.crMode);
+            this.crMode = this.repo.determineCrMode(
+                this.crMode,
+                this.hasChangingObjects(),
+                !!this.motion?.modified_final_version,
+                this.motion?.isParagraphBasedAmendment(),
+                this.changeRecommendations?.length > 0
+            );
         }
 
         this.cd.markForCheck();
@@ -1624,40 +1636,6 @@ export class MotionDetailComponent extends BaseViewComponentDirective implements
         }
     }
 
-    /**
-     * Tries to determine the realistic CR-Mode from a given CR mode
-     */
-    private determineCrMode(mode: ChangeRecoMode): ChangeRecoMode {
-        if (mode === ChangeRecoMode.Final) {
-            if (this.motion?.modified_final_version) {
-                return ChangeRecoMode.ModifiedFinal;
-                /**
-                 * Because without change recos you cannot escape the final version anymore
-                 */
-            } else if (!this.hasChangingObjects()) {
-                return ChangeRecoMode.Original;
-            }
-        } else if (mode === ChangeRecoMode.Changed && !this.hasChangingObjects()) {
-            /**
-             * Because without change recos you cannot escape the changed version view
-             * You will not be able to automatically change to the Changed view after creating
-             * a change reco. The autoupdate has to come "after" this routine
-             */
-            return ChangeRecoMode.Original;
-        } else if (
-            mode === ChangeRecoMode.Diff &&
-            !this.changeRecommendations?.length &&
-            this.motion?.isParagraphBasedAmendment()
-        ) {
-            /**
-             * The Diff view for paragraph-based amendments is only relevant for change recommendations;
-             * the regular amendment changes are shown in the "original" view.
-             */
-            return ChangeRecoMode.Original;
-        }
-        return mode;
-    }
-
     /**
      * Function to listen to notifications if the user edits this motion.
      * Handles the notification messages.

client/src/app/slides/motions/motion/motion-slide.component.ts

@@ -69,7 +69,6 @@ export class MotionSlideComponent
         this.lnMode = value.data.line_numbering_mode;
         this.lineLength = value.data.line_length;
         this.preamble = value.data.preamble;
-        this.crMode = value.element.mode || 'original';
 
         this.textDivStyles.width = value.data.show_meta_box ? 'calc(100% - 250px)' : '100%';
 
@@ -80,6 +79,14 @@ export class MotionSlideComponent
         }
 
         this.recalcUnifiedChanges();
+
+        this.crMode = this.motionRepo.determineCrMode(
+            value.element.mode || 'original',
+            this.allChangingObjects.length > 0,
+            !!this.data.data.modified_final_version,
+            this.isParagraphBasedAmendment(),
+            this.data.data.change_recommendations.length > 0
+        );
     }
 
     public get data(): SlideData<MotionSlideData> {