Improvement "Editor window to quickly open scenes" task #267

[DSivtsov]

forum thread linked to this PR

this PR update & improve early merged PR

this PR bring to the project:

• make more optimized Editor code (less calls in OnGUI())
• give additional possibilities to work with Tools for quickly open scenes
  How did you implement them?

Minor changes:

• separated code of SO "SceneAccessHolderSO" (SceneAccessHolderSO.cs) on:
  -- ReadOnlyPropertyDrawer.cs (It must be in Editor folder - "// The property drawer class should be placed in an editor script, inside a folder called Editor." from Unity Doc)
  -- SceneAccessHolderSOReadOnlyAttribute.cs (It must be not in Editor folder, now in folder with corresponding SO)
  -- now "SceneAccessHolderSO.cs" contain only clean SO.

Major changes:

• SceneAccessTool.cs
  -- Not demand initial creation of SceneAccessHolderSO, if it absent will create automatically
  -- Fully sync the window "SceneAccessTool" and SceneAccessHolderSO, The user can simultaneously change the SceneListing values and window display parameters directly in the window itself or in the inspector (by change SO).
• added SceneAccessSOEditor : Editor, which update window if SO changed.
• window display parameters save to SO and will restored, if window was closed
• optimized OnGUI () to reduce the number of method calls
• corrected work with ReorderableList (ToggleEditMode()/OnGui()/OnEnable())
  

[amel-unity]

Hi @DSivtsov! I just merged this PR to replace the current tool as mentioned in the thread so I will need to close this PR. Thanks a lot again for helping with this task.
Also, feel free to open another PR if you have ideas to improve the new tool.