[SuperEditor] - Update ime integration to work with custom selection types, and add AttachmentListNode as proof of concept#3019

Draft

matthew-carroll wants to merge 8 commits into

stable_3106_update-ime-integration-to-work-with-custom-selection-types

Commits on May 26, 2026

Broke down existing IME tests to multiple files to make it easier to add new tests for editable non-text nodes, like a list of attachments
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WIP: Attachment list node IME support
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Added attachment list node and component as forcing function for generic IME and layout for flowable content
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Implemented AttachmentListNode with IME support, arrow key movement, and splitting, combining and deleting
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Removed print statements
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Fixed typo in type comparison that broke a bunch of tests
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Fixed all tests
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Fixed compilation issue after Flutter upgrade
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