IDEA-184729 Remember Preview state for SvgEditor and reuse it when opening new ones

images/src/org/intellij/images/editor/impl/ImageFileEditorProvider.java

@@ -48,7 +48,7 @@ final class ImageFileEditorProvider implements FileEditorProvider, DumbAware {
   public FileEditor createEditor(@NotNull Project project, @NotNull VirtualFile file) {
     ImageFileEditorImpl viewer = new ImageFileEditorImpl(project, file);
     if ("svg".equalsIgnoreCase(file.getExtension())) {
-      return new TextEditorWithPreview((TextEditor)TextEditorProvider.getInstance().createEditor(project, file), viewer);
+      return new TextEditorWithPreview((TextEditor)TextEditorProvider.getInstance().createEditor(project, file), viewer, "SvgEditor");
     }
     return viewer;
   }

platform/platform-impl/src/com/intellij/openapi/fileEditor/TextEditorWithPreview.java

@@ -1,23 +1,12 @@
 /*
- * Copyright 2000-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
  */
 package com.intellij.openapi.fileEditor;
 
 import com.intellij.codeHighlighting.BackgroundEditorHighlighter;
 import com.intellij.icons.AllIcons;
 import com.intellij.ide.structureView.StructureViewBuilder;
+import com.intellij.ide.util.PropertiesComponent;
 import com.intellij.openapi.Disposable;
 import com.intellij.openapi.actionSystem.*;
 import com.intellij.openapi.editor.ex.EditorGutterComponentEx;
@@ -120,7 +109,10 @@ public class TextEditorWithPreview extends UserDataHolderBase implements FileEdi
       final JPanel result = new JPanel(new BorderLayout());
       result.add(myToolbarWrapper, BorderLayout.NORTH);
       result.add(splitter, BorderLayout.CENTER);
-      if (myLayout == null) myLayout = Layout.SHOW_EDITOR_AND_PREVIEW;
+      if (myLayout == null) {
+        String lastUsed = PropertiesComponent.getInstance().getValue(getLayoutPropertyName());
+        myLayout = Layout.fromName(lastUsed, Layout.SHOW_EDITOR_AND_PREVIEW);
+      }
       adjustEditorsVisibility();
 
       myComponent = result;
@@ -409,6 +401,15 @@ public class TextEditorWithPreview extends UserDataHolderBase implements FileEdi
       myIcon = icon;
     }
 
+    public static Layout fromName(String name, Layout defaultValue) {
+      for (Layout layout : Layout.values()) {
+        if (layout.myName.equals(name)) {
+          return layout;
+        }
+      }
+      return defaultValue;
+    }
+
     public String getName() {
       return myName;
     }
@@ -435,8 +436,14 @@ public class TextEditorWithPreview extends UserDataHolderBase implements FileEdi
     public void setSelected(AnActionEvent e, boolean state) {
       if (state) {
         myLayout = myActionLayout;
+        PropertiesComponent.getInstance().setValue(getLayoutPropertyName(), myLayout.myName, Layout.SHOW_EDITOR_AND_PREVIEW.myName);
         adjustEditorsVisibility();
       }
     }
   }
+
+  @NotNull
+  private String getLayoutPropertyName() {
+    return myName + "Layout";
+  }
 }