[log] IDEA-117920 Remember 'show long edges' setting between refreshes & restarts

Persist the setting, restore it after each DataPack update.

platform/vcs-log/impl/src/com/intellij/vcs/log/data/VcsLogUiProperties.java

@@ -41,6 +41,7 @@ public class VcsLogUiProperties implements PersistentStateComponent<VcsLogUiProp
 
   public static class State {
     public boolean SHOW_DETAILS = true;
+    public boolean LONG_EDGES_VISIBLE = false;
     public Deque<UserGroup> RECENTLY_FILTERED_USER_GROUPS = new ArrayDeque<UserGroup>();
     public Deque<UserGroup> RECENTLY_FILTERED_BRANCH_GROUPS = new ArrayDeque<UserGroup>();
   }
@@ -108,6 +109,14 @@ public class VcsLogUiProperties implements PersistentStateComponent<VcsLogUiProp
     });
   }
 
+  public boolean areLongEdgesVisible() {
+    return myState.LONG_EDGES_VISIBLE;
+  }
+
+  public void setLongEdgesVisibility(boolean visible) {
+    myState.LONG_EDGES_VISIBLE = visible;
+  }
+
   public static class UserGroup {
     public List<String> users = new ArrayList<String>();
 

platform/vcs-log/impl/src/com/intellij/vcs/log/ui/VcsLogUiImpl.java

@@ -43,6 +43,7 @@ public class VcsLogUiImpl implements VcsLogUi, Disposable {
   @NotNull private final VcsLogColorManager myColorManager;
   @NotNull private final VcsLogFilterer myFilterer;
   @NotNull private final VcsLog myLog;
+  @NotNull private final VcsLogUiProperties myUiProperties;
 
   @NotNull private final Collection<VcsLogFilterChangeListener> myFilterChangeListeners = ContainerUtil.newArrayList();
 
@@ -53,6 +54,7 @@ public class VcsLogUiImpl implements VcsLogUi, Disposable {
     myLogDataHolder = logDataHolder;
     myProject = project;
     myColorManager = manager;
+    myUiProperties = uiProperties;
     myDataPack = initialDataPack;
     Disposer.register(logDataHolder, this);
 
@@ -152,6 +154,7 @@ public class VcsLogUiImpl implements VcsLogUi, Disposable {
 
   public void setLongEdgeVisibility(boolean visibility) {
     handleAnswer(myDataPack.getGraphFacade().performAction(LongEdgesAction.valueOf(visibility)));
+    myUiProperties.setLongEdgesVisibility(visibility);
   }
 
   public boolean areLongEdgesHidden() {
@@ -288,6 +291,7 @@ public class VcsLogUiImpl implements VcsLogUi, Disposable {
             myDataPack = dataPack;
             setModel(newModel, myDataPack, previouslySelected);
             myMainFrame.updateDataPack(myDataPack);
+            setLongEdgeVisibility(myUiProperties.areLongEdgesVisible());
             fireFilterChangeEvent();
             repaintUI();