Imporved user guide - added documentation for some undocumented flags.

doc/user-guide.md

@@ -29,8 +29,8 @@
   - [`MiddleMouseButtonClosesTab`](#middlemousebuttonclosestab)
   - [`DisableTabTextEliding`](#disabletabtexteliding)
   - [`ShowTabTextOnlyForActiveTab`](#showtabtextonlyforactivetab)
-- [Auto-Hide Configuration Flags](#auto-hide-configuration-flags)
-  - [Auto Hide Dock Widgets](#auto-hide-dock-widgets)
+  - [`DoubleClickUndocksWidget`](#doubleclickundockswidget)
+- [Auto Hide Dock Widgets](#auto-hide-dock-widgets)
   - [Pinning Auto-Hide Widgets to a certain border](#pinning-auto-hide-widgets-to-a-certain-border)
   - [Show / Hide Auto-Hide Widgets via Mouse Over](#show--hide-auto-hide-widgets-via-mouse-over)
   - [Drag \& Drop to Auto-Hide](#drag--drop-to-auto-hide)
@@ -39,6 +39,7 @@
   - [Auto-Hide Drag to Float / Dock](#auto-hide-drag-to-float--dock)
   - [Auto-Hide Context Menu](#auto-hide-context-menu)
   - [Adding Auto Hide Widgets](#adding-auto-hide-widgets)
+- [Auto-Hide Configuration Flags](#auto-hide-configuration-flags)
   - [Setting Auto-Hide Flags](#setting-auto-hide-flags)
   - [`AutoHideFeatureEnabled`](#autohidefeatureenabled)
   - [`DockAreaHasAutoHideButton`](#dockareahasautohidebutton)
@@ -63,6 +64,8 @@
 - [Central Widget](#central-widget)
 - [Empty Dock Area](#empty-dock-area)
 - [Custom Close Handling](#custom-close-handling)
+- [Globally Lock Docking Features](#globally-lock-docking-features)
+- [Dock Widget Size / Minimum Size Handling](#dock-widget-size--minimum-size-handling)
 - [Styling](#styling)
   - [Disabling the Internal Style Sheet](#disabling-the-internal-style-sheet)
 
@@ -496,9 +499,12 @@ for active tabs. Inactive tabs only show their icon:
 
 ![MShowTabTextOnlyForActiveTab true](cfg_flag_ShowTabTextOnlyForActiveTab_true.png)
 
-## Auto-Hide Configuration Flags
+### `DoubleClickUndocksWidget`
+
+If the flag is set (default), a double click on a tab undocks the dock widget.
+If you would like to disable undocking, just clear this flag.
 
-### Auto Hide Dock Widgets
+## Auto Hide Dock Widgets
 
 The Advanced Docking System supports "Auto-Hide" functionality for **all**
 dock containers. The "Auto Hide" feature allows to display more information
@@ -599,6 +605,8 @@ DockManager->addAutoHideDockWidget(SideBarLeft, TableDockWidget);
 
 See `autohide` example or the demo application to learn how it works.
 
+## Auto-Hide Configuration Flags
+
 ### Setting Auto-Hide Flags
 
 The Advanced Docking System has a number of global configuration flags to
@@ -835,6 +843,93 @@ Normally clicking the close button of a dock widget will just hide the widget an
 
 When an entire area is closed, the default behavior is to hide the dock widgets it contains regardless of the `DockWidgetDeleteOnClose` flag except if there is only one dock widget. In this special case, the `DockWidgetDeleteOnClose` flag is followed. This behavior can be changed by setting the `DockWidgetForceCloseWithArea` flag to all the dock widgets that needs to be closed with their area.
 
+## Globally Lock Docking Features
+
+It is possible to globally lock features of all dock widgets to "freeze" the
+current workspace layout. That means, you can now lock your workspace
+to avoid accidentally dragging a docked view. When locking was't possible,
+users had to manually dock it back to the desired place after each accidental
+undock.
+
+You can use a combination of the following feature flags to define which features
+shall get locked:
+
+- CDockWidget::DockWidgetClosable
+- CDockWidget::DockWidgetMovable
+- CDockWidget::DockWidgetFloatable
+- CDockWidget::DockWidgetPinable
+
+To clear the locked features, you can use CDockWidget::NoDockWidgetFeatures
+The following code shows how to lock and unlock all dock widget features
+globally.
+
+```c++
+DockManager->lockDockWidgetFeaturesGlobally();
+DockManager->lockDockWidgetFeaturesGlobally(CDockWidget::NoDockWidgetFeatures);
+```
+
+## Dock Widget Size / Minimum Size Handling
+
+There are several `CDockWidget` mode enums to control how a `CDockWidget` is
+resized and how the docking system handles the minimum size of a dockwidget.
+
+The first one is the `eInsertMode` enum:
+
+```c++
+enum eInsertMode
+{
+    AutoScrollArea,
+    ForceScrollArea,
+    ForceNoScrollArea
+};
+```
+
+The InsertMode defines how the widget is inserted into the dock widget, when you 
+call the `CDockWidget::setWidget` method:
+
+```c++
+DockWidget->setWidget(widget, CDockWidget::AutoScrollArea);
+```
+
+The content of a dock widget should be resizable do a very small size to
+prevent the dock widget from blocking the resizing. To ensure, that a
+dock widget can be resized very well, it is better to insert the content
+widget into a scroll area or to provide a widget that is already a scroll
+area or that contains a scroll area (such as an `QAbstractItemView`)
+If the InsertMode is `AutoScrollArea`, the DockWidget tries to automatically
+detect how to insert the given widget. If the widget is derived from
+`QScrollArea` (i.e. an `QAbstractItemView`), then the widget is inserted
+directly. If the given widget is not a scroll area, the widget will be
+inserted into a scroll area.
+
+To force insertion into a scroll area, you can also provide the InsertMode
+`ForceScrollArea`. In this case a scroll area will also be created for content
+widgets that are derived from `QScrollArea` To prevent insertion into a scroll
+area, you can provide the InsertMode `ForceNoScrollArea`. In this case, the
+content widget is always inserted directly.
+
+A second enum, the `eMinimumSizeHintMode` defines, which value will be returned
+from the `CDockWidget::minimumSizeHint()` function:
+
+```c++
+enum eMinimumSizeHintMode
+{
+    MinimumSizeHintFromDockWidget,
+    MinimumSizeHintFromContent,
+    MinimumSizeHintFromDockWidgetMinimumSize,
+    MinimumSizeHintFromContentMinimumSize,
+};
+```
+
+To ensure, that a dock widget does not block resizing, the dock widget
+reimplements `minimumSizeHint()` function to return a very small minimum
+size hint. If you would like to adhere the `minimumSizeHint()` from the
+content widget, then set the `minimumSizeHintMode()` to
+`MinimumSizeHintFromContent`. If you would like to use the `minimumSize()`
+value of the content widget or the dock widget, then you can use the
+`MinimumSizeHintFromDockWidgetMinimumSize` or
+`MinimumSizeHintFromContentMinimumSize` modes.
+
 ## Styling
 
 The Advanced Docking System supports styling via [Qt Style Sheets](https://doc.qt.io/qt-5/stylesheet.html). All components like splitters, tabs, buttons, titlebar and