"ArgumentException" is thrown on opening the version control window.

Steps to reproduce:
1) Create new project
2) Edit > Project Settings > Editor
3) Under version control, select mode Perforce
4) Window > Asset management > Version control

Actual result: "ArgumentException: GUILayout: Mismatched LayoutGroup.repaint" exception is thrown in console

Expected result: No error is thrown in console

Note: Version control mode needs to be selected (Perforce) so that the VCS window can be opened.

Occurs in: 2019.1.0a12
Working fine in: 2019.1.011, 2018.3.0f2

Environment: Both Windows and Mac

Stack trace:
ArgumentException: GUILayout: Mismatched LayoutGroup.repaintUnityEngine.GUILayoutUtility.BeginLayoutGroup (UnityEngine.GUIStyle style, UnityEngine.GUILayoutOption[] options, System.Type layoutType) (at C:/buildslave/unity/build/Modules/IMGUI/GUILayoutUtility.cs:311)UnityEngine.GUILayout.BeginHorizontal (UnityEngine.GUIContent content, UnityEngine.GUIStyle style, UnityEngine.GUILayoutOption[] options) (at C:/buildslave/unity/build/Modules/IMGUI/GUILayout.cs:259)UnityEngine.GUILayout.BeginHorizontal (UnityEngine.GUILayoutOption[] options) (at C:/buildslave/unity/build/Modules/IMGUI/GUILayout.cs:250)UnityEditor.EditorSettingsInspector.OnInspectorGUI () (at C:/buildslave/unity/build/Editor/Mono/Inspector/EditorSettingsInspector.cs:357)UnityEditor.AssetSettingsProvider.OnGUI (System.String searchContext) (at C:/buildslave/unity/build/Editor/Mono/Settings/Providers/AssetSettingsProvider.cs:90)UnityEditor.SettingsWindow.DrawControls () (at C:/buildslave/unity/build/Editor/Mono/Settings/SettingsWindow.cs:297)UnityEditor.SettingsWindow.DrawSettingsPanel () (at C:/buildslave/unity/build/Editor/Mono/Settings/SettingsWindow.cs:288)UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:263)UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:449)UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent () (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:423)UnityEngine.UIElements.UIR.ImmediateRenderer.Draw (UnityEngine.UIElements.UIR.DrawChainState dcs) (at C:/buildslave/unity/build/Modules/UIElements/Renderer/UIRenderer/UIRenderers.cs:407)UnityEngine.UIElements.UIR.UIRenderDevice.ContinueChain (UnityEngine.UIElements.UIR.RendererBase head, UnityEngine.UIElements.UIR.DrawChainState dcs, System.Boolean outerChainsWithMeshRenderer) (at C:/buildslave/unity/build/Modules/UIElements/Renderer/UIRenderer/UIRenderDevice.cs:798)UnityEngine.UIElements.UIR.UIRenderDevice.DrawChain (UnityEngine.UIElements.UIR.RendererBase head, UnityEngine.Rect viewport, UnityEngine.Matrix4x4 projection, UnityEngine.Texture atlas) (at C:/buildslave/unity/build/Modules/UIElements/Renderer/UIRenderer/UIRenderDevice.cs:781)UnityEngine.UIElements.UIRRepaintUpdater.DrawChain (UnityEngine.Rect topRect, UnityEngine.Matrix4x4 projection) (at C:/buildslave/unity/build/Modules/UIElements/Renderer/UIRRepaintUpdater.cs:218)UnityEngine.UIElements.UIRRepaintUpdater.Update () (at C:/buildslave/unity/build/Modules/UIElements/Renderer/UIRRepaintUpdater.cs:190)UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTree () (at C:/buildslave/unity/build/Modules/UIElements/VisualTreeUpdater.cs:70)UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at C:/buildslave/unity/build/Modules/UIElements/Panel.cs:587)UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:235)UnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:68)UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)