Glitch with right-aligned inline inputs (Thrasos)

[mikeharv]

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Description

If a value input is set with a right alignment (e.g. 'procedures_defreturn') and inline inputs, the connection will move back and forth as it attempts to fit the insertion marker.

Reproduction steps

1. Open the Advanced Blockly Playground
2. Switch to the Thrasos renderer
3. Drag a function with return block to the workspace.
4. Use the context menu to set the inputs to be inline.
5. Attempt to drag a wide math expression block into the value input.

Stack trace

No response

Screenshots

Browsers

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[cpcallen]

This is definitely a valid bug report, but we're not sure how to change Blockly's behaviour to fix it.

It is caused by a particular combination of circumstances:

• Using a renderer that uses insertion markers instead of a replacement glow for value inputs.
• The input has to be inline and right aligned.
• It has to be in a block with a substantially wider input in a different row.
• The block(s) being dragged in need to be somewhat wide.

…and is governed by various settings (e.g. drag radii) that were introduced and tuned to make dragging feel fairly natural and intuitive in most cases.

We think you can resolve the user-facing issue by avoiding this particular combination of circumstances. We're happy to take suggestions about how Blockly should behave in these circumstances, noting the existing insertion marker algorithms.