Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Using the small canvaspreview to pan the patchbay resulted in an
exception when panning out of bounds of the window. In this case Carla
tried to create a QPoint with two floats, for which qt has no
constructor. This results in the panning to hang, as the event is
"handled" with an exception.

Casting these two values to int lets qt create the QPoint
and with that properly set the new cursor position, so panning can be
done in all edges again, without having to be precise with the cursor
positioning.

This is probably a left-over from a python2 to python3 migration, as
python did integer divison by default.

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Closes #1583

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

The `CanvasBox.positionChanged` signal expects to receive `x` and `y` as
`int`s, but they were being passed as `float`s, which mangled them on
the receiving signal handler.

This manifested as huge `x` and `y` values for canvas boxes, and when
saving and loading projects all boxes would hit the edge of the canvas
and get placed at the extreme edge.

Signed-off-by: falkTX <falktx@falktx.com>

Fixes this error, which would occur after `setPrecision` had been called
with a non-integer value.

```
Traceback (most recent call last):
  File "/usr/share/carla/carla_host.py", line 1442, in slot_handlePluginAddedCallback
    pitem = self.ui.listWidget.createItem(pluginId, self.fSavedSettings[CARLA_KEY_MAIN_CLASSIC_SKIN])
  File "/usr/share/carla/widgets/racklistwidget.py", line 241, in createItem
    return RackListItem(self, pluginId, useClassicSkin)
  File "/usr/share/carla/widgets/racklistwidget.py", line 86, in __init__
    self.recreateWidget(firstInit = True)
  File "/usr/share/carla/widgets/racklistwidget.py", line 176, in recreateWidget
    self.fWidget = createPluginSlot(self.fParent, self.host, self.fPluginId, self.fOptions)
  File "/usr/share/carla/carla_skin.py", line 2090, in createPluginSlot
    return PluginSlot_Default(parent, host, pluginId, skinColor, skinStyle)
  File "/usr/share/carla/carla_skin.py", line 1766, in __init__
    self.ready()
  File "/usr/share/carla/carla_skin.py", line 642, in ready
    paramWidget.setValue(self.host.get_internal_parameter_value(self.fPluginId, paramIndex))
  File "/usr/share/carla/widgets/scalabledial.py", line 282, in setValue
    QDial.setValue(self, qtValue)
TypeError: setValue(self, int): argument 2 has unexpected type 'float'
Error mapping plugin to canvas client: 16 Step Sequencer
```

Signed-off-by: falkTX <falktx@falktx.com>

Under certain circumstances Carla would crash when frequent updates on
the QGraphicsScene occurred, especially in combination with scrolling or
panning by the user. Backtraces showed either a segfault in
QGraphicsItem::parentItem() or around
QGraphicsSceneBspTree::climbTree(). While the first trace points towards
missing calls to pepareGeometryChange() in combination with custom
boundingRect() methods, inserting these did not yield a positive change,
though people with this issue also had success in disabling the
ItemIndexingMethod of their QGraphicsScene[0][1]. Setting this to
NoIndex solves this problem.

The original problem is reproducible with an ever-reconnecting client:

$ while true; do klick 120 & (sleep 0.1; killall klick); done

[0] https://bugreports.qt.io/browse/QTBUG-18021?focusedCommentId=367566&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-367566
[1] https://forum.qt.io/topic/71316/qgraphicsscenefinditembsptreevisitor-visit-crashes-due-to-an-obsolete-paintevent-after-qgraphicsscene-removeitem

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Closes #1454

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>

Signed-off-by: falkTX <falktx@falktx.com>