cannot be used normally in Blockly 12

[coloz]

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Description

error info:

ERROR TypeError: Cannot read properties of null (reading 'canBeFocused')
    at FocusManager$$module$build$src$core$focus_manager.focusNode (blockly_compressed.js:4674:41)
    at Object.setSelected$$module$build$src$core$common [as setSelected] (blockly_compressed.js:402:62)
    at MultiselectControls.updateMultiselect (multiselect_controls.js:390:24)
    at multiselect.js:371:18
    at Set.forEach (<anonymous>)
    at Multiselect.eventListenerAll_ (multiselect.js:370:31)

Reproduction steps

Stack trace

Screenshots

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Browsers

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[HollowMan6]

It appears that we need to implement IFocusableTree for our MultiselectDraggable to ensure proper support in Blockly 12. I'll try to check it out when I find time, Meanwhile, your help with PRs is always welcome!

[HollowMan6]

Posted a help request here: https://groups.google.com/g/blockly/c/7RSn9cXAulA

[green-study]

@HollowMan6 Hello, I’m one of the users who would like to use this multi-select feature with Blockly v12.
Could you let me know when the next release is expected?

[mark-friedman]

@green-study, There is work in progress on this in #133. AFAICT, it's fairly close.