blockly developer tools block display is broken

[rylid-umil]

Check for duplicates

• I have searched for similar issues before opening a new one.

Description

when ever i load a block from block library on firefox, the preview does not show no matter what. its supposed to be there. when i create a new block however, it works fine. all other block displays work.

Reproduction steps

1. have blocks in the block library
2. load one
3. look at the preview

Stack trace

No response

Screenshots

Browsers

Firefox desktop

[mrkprdo]

It could be that you have conflicting "names" in the editor workspace. If you see something like blue triangles next to the name, you should change that to something else.

[rylid-umil]

i dont have any conflicting names and it still doesnt show

[Njinx]

@rylid-umil Do you see this message on the left pane?

[lkarthee]

I have encountered same issue and it makes the dev workspace unusable.

All the blocks in workspace are not rendered in preview with the same error:

You can't make a block called <BlockName> in this tool because that name already exists. 4 factory.js:193:15
    warnExistingBlock factory.js:193
    updatePreview factory.js:205
    updateLanguage factory.js:148
    fireChangeListener workspace.ts:686
    fireNow$$module$build$src$core$events$utils utils.ts:249
    (Async: setTimeout handler)
    utils utils.ts:227
    (Async: FrameRequestCallback)
    fireInternal$$module$build$src$core$events$utils utils.ts:226
    fire$$module$build$src$core$events$utils utils.ts:211
    dispose block.ts:325
    dispose block_svg.ts:854
    clear workspace.ts:357
    clear workspace_svg.ts:2356
    openBlock block_library_controller.js:68
    setSelectedAndOpen_ block_library_controller.js:253
    makeOptionSelectHandler_ block_library_controller.js:271
    (Async: EventListener.handleEvent)
    addEventListener eval:4
    addOptionSelectHandler block_library_controller.js:278
    addOptionSelectHandlers block_library_controller.js:289
    populateBlockLibrary block_library_controller.js:165
    AppController app_controller.js:22
    init index.html:40
    (Async: EventListener.handleEvent)
    addEventListener eval:4
    <anonymous> index.html:44

I have checked local storage in the browser - it has no duplicate blocks.

Any Idea why this is happening ?

[993499094]

I had the same problem.

Reproduction steps

Blockly > Demos > Blockly Developer Tools
https://blockly-demo.appspot.com/static/demos/blockfactory/index.html
Workspace Save Share Link
https://blockly-demo.appspot.com/static/demos/blockfactory/index.html#debreq

Change the default name [block_type] to name [block_test]

• Save "block_test"
• F5 refresh the webpage

Click on "Block Library" and select "block_test".

• Dialog Box: You have unsaved changes. By proceeding without saving your block first, you will lose these changes.
• -YES!

Console error:
You can't make a block called block_test in this tool because that name already exists.
warnExistingBlock @ factory.js:

• Show blue warning icon name conflict
• And Preview: cannot display preview.
• but if you change "block_test" to "block_test_1", the preview will be display.

In summary: even if you select a saved block from the "Block Library", the program considers it to be a duplicate of the "NAME". The preview cannot be displayed.

[NeilFraser]

Another external report: https://groups.google.com/g/blockly/c/AIC5qvOXAn4

[alicialics]

@NeilFraser caused by Exporter importing these blocks:

blockly/demos/blockfactory/block_exporter_controller.js

Line 31 in 7d2c307

this.blockOptions = this.tools.createBlockSelectorFromLib(

blockly/demos/blockfactory/block_exporter_tools.js

Line 187 in 7d2c307

this.addBlockDefinitions(blockXmlMap);

[Apro123]

A quick workaround is to rename the block to show the preview, then rename it back when done editing/viewing before clicking "Update" (if necessary)

[lancefisher]

Another workaround is to clear local storage, then re-import your block library.

[cpcallen]

Marking this as triage again because it appears to be preventing people from updating to the new block factory.

[cpcallen]

I think this may be a duplicate of (or at least related to) #5570.

[tashee]

Seems to be called from updateLanguage which marks the Blocklyblock as already created in Firefox but not in Chrome