Evan W. Patton 455a5bb64c Add check to prevent spawning multiple blocks
Some App Inventor users were reporting issues where multiple blocks
were being created when dragging from the flyout. This commit adds a
lastBlockCreated field on the flyout that is used to detect whether a
creation operation has occurred since the last time the flyout was
opened. This field is cleared as part of clearOldBlocks_, which is
called during each show operation.
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Blockly

Google's Blockly is a web-based, visual programming editor. Users can drag blocks together to build programs. All code is free and open source.

The project page is https://developers.google.com/blockly/

Description
The web-based visual programming editor.
Readme Apache-2.0 250 MiB
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