ToolManager forcefully aborts about to start drag interaction, causing an error

[nikku]

Describe the Bug

In certain, yet to figure out circumstances the ToolManager cancels an about to start drag interaction, causing the subsequent automatically activating move interaction to fail.

This leads to the drag interaction blowing up, as the drag context that is being referred to is non existing anymore:

sentry.js:2 TypeError: Cannot read property 'payload' of null
    at c (Dragging.js:183)
    at oa.init (Dragging.js:525)
    at dm.start (GlobalConnect.js:99)
    at dm.toggle (GlobalConnect.js:116)
    at Object.globalConnectTool (BpmnEditorActions.js:94)
    at Jc.Uc.trigger (EditorActions.js:170)
    at BpmnKeyboardBindings.js:135
    at EventBus.js:520
    at qt._invokeListener (EventBus.js:371)
    at qt._invokeListeners (EventBus.js:352)
    at qt.fire (EventBus.js:313)
    at Qo._keyHandler (Keyboard.js:103)
    at Qo._keydownHandler (Keyboard.js:84)
    at HTMLDocument.r (sentry.js:2)

Steps to Reproduce

A combination of click and keyboard activation causes this bug. No clear way to reproduce (yet).

Expected Behavior

• Understand and dissect the tool manager
• Fix it, along with the palette tool toggling (clicking subsequently should toggle the selected tool on or off

Environment

Please complete the following information:

• Browser: Any
• OS: Any
• Library version: v7.x

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Related to Sentry issue.