* Add mouse grab
We now also send mouse movement events only to the interested view.
* Add deprecation messages handler
* Make various `View`s respect `on_mouse_left`
* `StatusView`
* `TitleView`
* `TreeView`
* `ToolbarView`
* Fix scrollbar in `TreeView` not updating
We were in some cases sending outdated mouse positions to the scrollbar,
which made it think that the mouse was hovering it.
This also updates the hovered item more responsively during scroll.
* Added in double-clicking on emptyview and tab bar.
* Fixed issue with split tabs.
* Early exit if no overlapping node.
* Changed category of command to tabbar.
* Additional cleanup.
* Changed for whether we should show tabs.
* Fixed erroneous hover.
* Add `Object:{is_class_of,is_extended_by}` to check inverse relationships
* Make tab scrolling more flexible
This adds tab scrolling commands and connects them to mouse scroll
events.
This way scrolling behavior can be customized more easily.
For example an alternative behavior could be:
```lua
keymap.add({
["wheelup"] = "root:switch-to-hovered-previous-tab",
["wheeldown"] = "root:switch-to-hovered-next-tab"
})
```
When a command is performed with parameters, those are now passed to the
predicate.
The predicate can then return, after the validity boolean, any other
value that will then be passed to the actual command.
If the predicate only returns the validity boolean, the original
parameters are passed through to the actual command.
This allows predicates to manipulate the received parameters, and allows
them to pass the result of an expensive computation to the actual
command, which won't have to recalculate it.
String and table predicates will now also return `core.active_view`.
Before the fix navigation between nodes in the root
view was broken: the scale factor wasn't taken into
account. Switching in the right and down directions
was impossible for scale factors greater than one.