Extension functions and properties defined for base classes and interfaces

**Describe the bug**

Extension functions and properties defined for base classes and interfaces - are lost.
For example (a bit simplified):
```kotlin
/** Container for child controls. */
interface Container {
 fun <T : Control<*>> add(widget: T): T
}

/** Wrapper class for [uiBox] - a container that stack its children horizontally or vertically. */
abstract class Box(alloc: CPointer<uiBox>?) : Control<uiBox>(alloc), Container {
 /** ... */
}

/** DSL builder for a simple button. */
inline fun Container.button(
 text: String,
 init: Button.() -> Unit = {}
): Button = add(Button(text).apply(init))

/** DSL builder for a checkbox widget. */
inline fun Container.checkbox(
 label: String,
 init: Checkbox.() -> Unit = {}
): Checkbox = add(Checkbox(label).apply(init))

/** .... */
```

Diff for what was generated by Dokka 0.9.17 and Dokka 1.4.32:
``` diff 
 # Box
 
-`abstract class Box : `[`Control`](../-control/README.md)`<`[`uiBox`](../../libui/ui-box.md)`>, `[`Container`](../-container/README.md)
+`abstract class `[`Box`](README.md)`(alloc: CPointer<uiBox>?) : `[`Control`](../-control/README.md)`<uiBox> , `[`Container`](../-container/README.md)
+
+Wrapper class for uiBox - a container that stack its children horizontally or vertically.
 
-Wrapper class for [uiBox](../../libui/ui-box.md) - a container that stack its children horizontally or vertically.
 
 ### Constructors
 
-| Name | Summary |
+| | |
 |---|---|
-| [Box](-box.md) | `Box(alloc: CPointer<`[`uiBox`](../../libui/ui-box.md)`>?)` Wrapper class for [uiBox](../../libui/ui-box.md) - a container that stack its children horizontally or vertically. |
+| [Box](-box.md) | `fun `[`Box`](-box.md)`(alloc: CPointer<uiBox>?)` |
 
 ### Properties
 
 | Name | Summary |
 |---|---|
-| [padded](padded.md) | `var padded: Boolean` If `true`, the container insert some space between children. |
-| [stretchy](stretchy.md) | `var stretchy: Boolean` Next added child should expand to use all available size. |
+| [padded](padded.md) | `var `[`padded`](padded.md)`: Boolean` If `true`, the container insert some space between children. |
+| [stretchy](stretchy.md) | `var `[`stretchy`](stretchy.md)`: Boolean = false` Next added child should expand to use all available size. |
 
 ### Inherited properties
 
 | Name | Summary |
 |---|---|
-| [enabled](../-control/enabled.md) | `var enabled: Boolean` Whether the Control should be enabled or disabled. Defaults to `true`. |
-| [parent](../-control/parent.md) | `var parent: `[`Control`](../-control/README.md)`<*>?` Returns parent of the control or `null` for detached. |
-| [toplevel](../-control/toplevel.md) | `val toplevel: Boolean` Returns whether the control is a top level one or not. |
-| [visible](../-control/visible.md) | `var visible: Boolean` Whether the Control should be visible or hidden. Defaults to `true`. |
+| [disposed](README.md#115031071%2FProperties%2F123127132) | `val `[`disposed`](README.md#115031071%2FProperties%2F123127132)`: Boolean` Returns `true` if object was disposed - in this case [dispose](../-disposable/dispose.md) will do nothing, all other operations are invalid and will `throw Error("Resource is disposed")`. |
+| [enabled](README.md#-2142328875%2FProperties%2F123127132) | `var `[`enabled`](README.md#-2142328875%2FProperties%2F123127132)`: Boolean` Whether the Control should be enabled or disabled. |
+| [parent](README.md#-27209990%2FProperties%2F123127132) | `var `[`parent`](README.md#-27209990%2FProperties%2F123127132)`: `[`Control`](../-control/README.md)`<*>?` Returns parent of the control or `null` for detached. |
+| [toplevel](README.md#405419573%2FProperties%2F123127132) | `val `[`toplevel`](README.md#405419573%2FProperties%2F123127132)`: Boolean` Returns whether the control is a top level one or not. |
+| [visible](README.md#2066795460%2FProperties%2F123127132) | `var `[`visible`](README.md#2066795460%2FProperties%2F123127132)`: Boolean` Whether the Control should be visible or hidden. |
 
 ### Functions
 
 | Name | Summary |
 |---|---|
-| [add](add.md) | `open fun <T : `[`Control`](../-control/README.md)`<*>> add(widget: `[`T`](add.md#T)`): `[`T`](add.md#T) Adds the given widget to the end of the Box. |
-| [delete](delete.md) | `fun delete(index: Int): Unit` Deletes the nth control of the Box. |
+| [add](add.md) | `open override fun <`[`T`](add.md)` : `[`Control`](../-control/README.md)`<*>> `[`add`](add.md)`(widget: `[`T`](add.md)`): `[`T`](add.md) Adds the given widget to the end of the Box. |
+| [delete](delete.md) | `fun `[`delete`](delete.md)`(index: Int)` Deletes the nth control of the Box. |
 
 ### Inherited functions
 
 | Name | Summary |
 |---|---|
-| [disable](../-control/disable.md) | `fun disable(): Unit` Disables the Control. |
-| [dispose](../-control/dispose.md) | `open fun dispose(): Unit` Dispose and free all allocated resources. |
-| [enable](../-control/enable.md) | `fun enable(): Unit` Enables the Control. |
-| [getHandle](../-control/get-handle.md) | `fun getHandle(): ULong` Returns the OS-level handle associated with this Control. |
-| [hide](../-control/hide.md) | `fun hide(): Unit` Hides the Control. Hidden controls do not participate in layout (that is, Box, GridPane, etc. does not reserve space for hidden controls). |
-| [isEnabled](../-control/is-enabled.md) | `fun isEnabled(): Boolean` Whether the Control is enabled. |
-| [isEnabledToUser](../-control/is-enabled-to-user.md) | `fun isEnabledToUser(): Boolean` Whether the Control and all parents are enabled. |
-| [isVisible](../-control/is-visible.md) | `fun isVisible(): Boolean` Whether the Control is visible. |
-| [show](../-control/show.md) | `fun show(): Unit` Shows the Control. |
+| [disable](../-control/disable.md) | `fun `[`disable`](../-control/disable.md)`()` Disables the Control. |
+| [dispose](../-control/dispose.md) | `open override fun `[`dispose`](../-control/dispose.md)`()` Dispose and free all allocated resources. |
+| [enable](../-control/enable.md) | `fun `[`enable`](../-control/enable.md)`()` Enables the Control. |
+| [getHandle](../-control/get-handle.md) | `fun `[`getHandle`](../-control/get-handle.md)`(): ULong` Returns the OS-level handle associated with this Control. |
+| [hide](../-control/hide.md) | `fun `[`hide`](../-control/hide.md)`()` Hides the Control. |
+| [isEnabled](../-control/is-enabled.md) | `fun `[`isEnabled`](../-control/is-enabled.md)`(): Boolean` Whether the Control is enabled. |
+| [isEnabledToUser](../-control/is-enabled-to-user.md) | `fun `[`isEnabledToUser`](../-control/is-enabled-to-user.md)`(): Boolean` Whether the Control and all parents are enabled. |
+| [isVisible](../-control/is-visible.md) | `fun `[`isVisible`](../-control/is-visible.md)`(): Boolean` Whether the Control is visible. |
+| [show](../-control/show.md) | `fun `[`show`](../-control/show.md)`()` Shows the Control. |
-
-### Extension properties
-
-| Name | Summary |
-|---|---|
-| [hbox](../hbox.md) | `val `[`Container`](../-container/README.md)`.hbox: `[`HBox`](../-h-box/README.md) DSL builder for a container that stack its children horizontally. |
-| [vbox](../vbox.md) | `val `[`Container`](../-container/README.md)`.vbox: `[`VBox`](../-v-box/README.md) DSL builder for a container that stack its children vertically. |
-
-### Extension functions
-
-| Name | Summary |
-|---|---|
-| [button](../button.md) | `fun `[`Container`](../-container/README.md)`.button(text: String, init: `[`Button`](../-button/README.md)`.() -> Unit = {}): `[`Button`](../-button/README.md) DSL builder for a simple button. |
-| [checkbox](../checkbox.md) | `fun `[`Container`](../-container/README.md)`.checkbox(label: String, init: `[`Checkbox`](../-checkbox/README.md)`.() -> Unit = {}): `[`Checkbox`](../-checkbox/README.md) DSL builder for a checkbox widget. |
-| [colorbutton](../colorbutton.md) | `fun `[`Container`](../-container/README.md)`.colorbutton(init: `[`ColorButton`](../-color-button/README.md)`.() -> Unit = {}): `[`ColorButton`](../-color-button/README.md) DSL builder for a button that opens a color palette popup. |
-| [combobox](../combobox.md) | `fun `[`Container`](../-container/README.md)`.combobox(init: `[`Combobox`](../-combobox/README.md)`.() -> Unit = {}): `[`Combobox`](../-combobox/README.md) DSL builder for a drop down combo box that allow list selection only. |
-| [datepicker](../datepicker.md) | `fun `[`Container`](../-container/README.md)`.datepicker(init: `[`DatePicker`](../-date-picker/README.md)`.() -> Unit = {}): `[`DatePicker`](../-date-picker/README.md) DSL builder for a widget to edit date. |
-| [datetimepicker](../datetimepicker.md) | `fun `[`Container`](../-container/README.md)`.datetimepicker(init: `[`DateTimePicker`](../-date-time-picker/README.md)`.() -> Unit = {}): `[`DateTimePicker`](../-date-time-picker/README.md) DSL builder for a widget to edit date and time. |
-| [drawarea](../drawarea.md) | `fun `[`Container`](../-container/README.md)`.drawarea(init: `[`DrawArea`](../-draw-area/README.md)`.() -> Unit = {}): `[`DrawArea`](../-draw-area/README.md) DSL builder for a canvas you can draw on. It also receives keyboard and mouse events, is DPI aware, and has several other useful features. |
-| [editablecombobox](../editablecombobox.md) | `fun `[`Container`](../-container/README.md)`.editablecombobox(init: `[`EditableCombobox`](../-editable-combobox/README.md)`.() -> Unit = {}): `[`EditableCombobox`](../-editable-combobox/README.md) DSL builder for a drop down combo box that allow selection from list or free text entry. |
-| [fontbutton](../fontbutton.md) | `fun `[`Container`](../-container/README.md)`.fontbutton(init: `[`FontButton`](../-font-button/README.md)`.() -> Unit = {}): `[`FontButton`](../-font-button/README.md) DSL builder for a button that allows users to choose a font when they click on it. |
-| [form](../form.md) | `fun `[`Container`](../-container/README.md)`.form(padded: Boolean = true, init: `[`Form`](../-form/README.md)`.() -> Unit = {}): `[`Form`](../-form/README.md) DSL builder for a container that organize children as labeled fields. |
-| [gridpane](../gridpane.md) | `fun `[`Container`](../-container/README.md)`.gridpane(padded: Boolean = true, init: `[`GridPane`](../-grid-pane/README.md)`.() -> Unit = {}): `[`GridPane`](../-grid-pane/README.md) DSL builder for a powerful container that allow to specify size and position of each children. |
-| [group](../group.md) | `fun `[`Container`](../-container/README.md)`.group(title: String, margined: Boolean = true, init: `[`Group`](../-group/README.md)`.() -> Unit = {}): `[`Group`](../-group/README.md) DSL builder for a container for a single widget that provide a caption and visually group it's children. |
-| [hbox](../hbox.md) | `fun `[`Container`](../-container/README.md)`.hbox(padded: Boolean = true, init: `[`HBox`](../-h-box/README.md)`.() -> Unit = {}): `[`HBox`](../-h-box/README.md) DSL builder for a container that stack its children horizontally. |
-| [label](../label.md) | `fun `[`Container`](../-container/README.md)`.label(text: String, init: `[`Label`](../-label/README.md)`.() -> Unit = {}): `[`Label`](../-label/README.md) DSL builder for a static text label. |
-| [passwordfield](../passwordfield.md) | `fun `[`Container`](../-container/README.md)`.passwordfield(readonly: Boolean = false, init: `[`PasswordField`](../-password-field/README.md)`.() -> Unit = {}): `[`PasswordField`](../-password-field/README.md) DSL builder for a text entry widget that mask the input, useful to edit passwords or other sensible data. |
-| [progressbar](../progressbar.md) | `fun `[`Container`](../-container/README.md)`.progressbar(init: `[`ProgressBar`](../-progress-bar/README.md)`.() -> Unit = {}): `[`ProgressBar`](../-progress-bar/README.md) DSL builder for a progress bar widget. |
-| [radiobuttons](../radiobuttons.md) | `fun `[`Container`](../-container/README.md)`.radiobuttons(init: `[`RadioButtons`](../-radio-buttons/README.md)`.() -> Unit = {}): `[`RadioButtons`](../-radio-buttons/README.md) DSL builder for a widget that represent a group of radio options. |
-| [scrollingarea](../scrollingarea.md) | `fun `[`Container`](../-container/README.md)`.scrollingarea(width: Int, height: Int, init: `[`ScrollingArea`](../-scrolling-area/README.md)`.() -> Unit = {}): `[`ScrollingArea`](../-scrolling-area/README.md) DSL builder for a canvas with horziontal and vertical scrollbars. |
-| [searchfield](../searchfield.md) | `fun `[`Container`](../-container/README.md)`.searchfield(readonly: Boolean = false, init: `[`SearchField`](../-search-field/README.md)`.() -> Unit = {}): `[`SearchField`](../-search-field/README.md) DSL builder for a text entry widget to search text. |
-| [slider](../slider.md) | `fun `[`Container`](../-container/README.md)`.slider(min: Int, max: Int, init: `[`Slider`](../-slider/README.md)`.() -> Unit = {}): `[`Slider`](../-slider/README.md) DSL builder for an horizontal slide to set numerical values. |
-| [spinbox](../spinbox.md) | `fun `[`Container`](../-container/README.md)`.spinbox(min: Int, max: Int, init: `[`Spinbox`](../-spinbox/README.md)`.() -> Unit = {}): `[`Spinbox`](../-spinbox/README.md) DSL builder for an entry widget for numerical values. |
-| [tableview](../tableview.md) | `fun <T> `[`Container`](../-container/README.md)`.tableview(data: List<`[`T`](../tableview.md#T)`>, init: `[`Table`](../-table/README.md)`<`[`T`](../tableview.md#T)`>.() -> Unit = {}): `[`TableView`](../-table-view/README.md) DSL builder to visualize data in a tabular form. |
-| [tabpane](../tabpane.md) | `fun `[`Container`](../-container/README.md)`.tabpane(init: `[`TabPane`](../-tab-pane/README.md)`.() -> Unit = {}): `[`TabPane`](../-tab-pane/README.md) DSL builder for a container that show each children in a separate tab. |
-| [textarea](../textarea.md) | `fun `[`Container`](../-container/README.md)`.textarea(wrap: Boolean = true, init: `[`TextArea`](../-text-area/README.md)`.() -> Unit = {}): `[`TextArea`](../-text-area/README.md) DSL builder for a multiline plain text editing widget. |
-| [textfield](../textfield.md) | `fun `[`Container`](../-container/README.md)`.textfield(readonly: Boolean = false, init: `[`TextField`](../-text-field/README.md)`.() -> Unit = {}): `[`TextField`](../-text-field/README.md) DSL builder for a simple single line text entry widget. |
-| [timepicker](../timepicker.md) | `fun `[`Container`](../-container/README.md)`.timepicker(init: `[`TimePicker`](../-time-picker/README.md)`.() -> Unit = {}): `[`TimePicker`](../-time-picker/README.md) DSL builder for a widget to edit time. |
-| [vbox](../vbox.md) | `fun `[`Container`](../-container/README.md)`.vbox(padded: Boolean = true, init: `[`VBox`](../-v-box/README.md)`.() -> Unit = {}): `[`VBox`](../-v-box/README.md) DSL builder for a container that stack its children vertically. |
 
 ### Inheritors
 
-| Name | Summary |
-|---|---|
-| [HBox](../-h-box/README.md) | `class HBox : `[`Box`](README.md) Wrapper class for [uiBox](../../libui/ui-box.md) - a container that stack its children horizontally. |
-| [VBox](../-v-box/README.md) | `class VBox : `[`Box`](README.md) Wrapper class for [uiBox](../../libui/ui-box.md) - a container that stack its children vertically. |
+| Name |
+|---|
+| [HBox](../-h-box/README.md) |
+| [VBox](../-v-box/README.md) |
+
```

**Expected behaviour**
Not sure, but maybe add new sections "Inherited extension functions" and "Inherited extension properties"
But anyway - not just lose it.

**To Reproduce**
https://github.com/msink/kotlin-libui/tree/dokka

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Extension functions and properties defined for base classes and interfaces #1908

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Extension functions and properties defined for base classes and interfaces #1908

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