feat: Update backspace handling in nested blocks (BLO-1326) - #3124
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe Backspace behavior option is removed. The merge command can now merge a first child into a compatible parent. The keyboard shortcut extension updates nested-block Backspace handling, including empty-block removal and fallback lifting. ChangesNested block editing
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant KeyboardShortcutsExtension
participant mergeBlocksCommand
participant Transaction
KeyboardShortcutsExtension->>mergeBlocksCommand: request merge at block start
mergeBlocksCommand->>Transaction: update document and selection
Suggested reviewers: Merge Risk: ⚪ Minimal · up to Nested Backspace merges preserve the surviving block’s identity and props under the inspected behavior. No actionable merge-blocking issue remains in the supplied review context; the change is ready for normal checks. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change restructures blocks in the current editor document. The reviewed path shows no new privileged access, but its effect on downstream document synchronization has not been established. Retained concerns Security review detailsSecurity Blast Radius
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matthewlipski
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Inline comments:
In `@packages/core/src/api/blockManipulation/commands/mergeBlocks/mergeBlocks.ts`:
- Line 118: Restore the non-empty content check in the sibling compatibility
predicate used by mergeBlocksCommand so empty siblings do not merge and replace
the non-empty block’s identity; keep first-child parent merges permissive by
checking only inline-content compatibility in that separate path.
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⚙️ Run configuration
Configuration used: Organization UI
Review profile: CHILL
Plan: Advanced
Run ID: cf635023-75fd-4b6e-8e9a-dc07e940a39b
📒 Files selected for processing (6)
packages/core/src/api/blockManipulation/commands/mergeBlocks/mergeBlocks.test.tspackages/core/src/api/blockManipulation/commands/mergeBlocks/mergeBlocks.tspackages/core/src/editor/BlockNoteEditor.tspackages/core/src/editor/managers/ExtensionManager/extensions.tspackages/core/src/extensions/tiptap-extensions/KeyboardShortcuts/KeyboardShortcutsExtension.test.tspackages/core/src/extensions/tiptap-extensions/KeyboardShortcuts/KeyboardShortcutsExtension.ts
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nperez0111
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@matthewlipski I don't think this is the right direction for a solution at all. This should not be configurable behavior. Looking at the video it seems to me like a bug in how an empty block with children is treated. It should be treated as a merge but is being treated as an unindent.
I don't think it is acceptable for users to have configure which behavior they get and be forced to deal with the downsides of picking one strategy or another.
I think the choice of whether to merge or unindent is purely a function of the current block & it's previous block (and their respective indentations), and we should come up with rules for how they should work.
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I think it's fair to not have the behaviour be configurable, but having backspace at the start of a nested block unindent it was IIRC a deliberate UX decision we made, not a bug. Hence why I made the decision to make it configurable. In any case, the behaviour when the option is set to In pseudocode, pressing backspace at the start of a nested block currently does the following: I think this behaviour is correct. Can I just remove the configurability then and make the |
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Also a quick note - pressing backspace at the start of a list item in Notion changes it to a paragraph first, regardless of nesting. This is the same behaviour as we already had and is unchanged in this PR. |
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Yep, I like this framing. One thing that I'd add is that I wonder whether some of this can be built into the merge blocks command, like it should be smart enough to do some of this logic (merging block into the previous sibling or into parent for example), but it shouldn't do all of the actions, like it should never delete the block or delete any block at all really. But, maybe this doesn't fit what that command does. |
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matthewlipski
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nperez0111
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nperez0111
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This looks right code-wise. My only comment would be that we could probably reduce some of the branches with some early-returns, but I don't care that much about it.
I think it's more important to get the UX right on this, so I'll ask for @YousefED to review it from that perspective since he's really good about that
Brings in #3124 (nested Backspace) and ports it to this branch's BlockInfo API (`block`, `content`, `children`, `hasContent`, `contentKind`): - mergeBlocks: `mergeIntoParent` and the permissive sibling merge from #3124, in the new field names. The block above may be empty, as in Notion. - KeyboardShortcutsExtension: #3124's Backspace order (merge before un-nest, un-nesting last) and its empty-block handler, in the new names. - keyboardhandlers e2e: take main's `{End}` fix for the flaky caret. - The characterization test for Backspace at the start of a nested first child now expects #3124's merge into the parent.
Brings in main (including #3124, nested Backspace, and #3062, Dark Reader mutations) through #3051. - mergeBlocks: #3124's merge into the parent is the general parent path; its content comes from `getMergeContent`, so an owned plain-text title still takes its first child's text. The sibling merge keeps plain-text handling and no longer refuses an empty block above (as in Notion). - KeyboardShortcutsExtension: #3124's Backspace order (un-nest last) and its empty-block handler; a titled block with children above still takes the move-into-body branch, but the "must be inline" check is gone. - nodeViewMutations: block content node views use #3062's Dark Reader rule. Frames keep ignoring their own chrome via a new `ignoreFrameChromeMutations` (marked TODO(review)). - Keep both sides' new keyboard tests; regenerate the lockfile.
…-rules Brings in main (#3124 nested Backspace, #3062 Dark Reader mutations) through #3051 and #3059, and consolidates #3124 with the keyboard settings. - mergeBlocks: #3124's merge into the parent replaces the interim "title's first child" code. `isTitle` is removed: only inline content merges, so a block with plain-text content never takes merged text (documented on `enter: "into-children"`). The block above may be empty (Notion). - KeyboardShortcutsExtension: #3124's Backspace order (merge before un-nest); the final un-nest step respects `childrenCanOutdent`. - Tests: keep both sides' keyboard tests; the block identity test for Backspace below an empty block now expects the Notion behaviour; the plain-text title merge test is removed. - Keep the toggleable-blocks example deleted; reconcile the lockfile; regenerate example files for main's template.
…550) Backspace at the start of a block below an empty block with the same type and props moves the block up into its place: it keeps its id, props and children. Below an empty block of another type, the text still moves into that block, which keeps its id, type and props (Notion, #3124). Delete at the end of the empty block does the same. Also: the placeholder extension sets its editor class through ProseMirror's `attributes` prop instead of on `view.dom`. ProseMirror flushed the outside change 20ms later, which could outlive the editor in tests ("document is not defined").
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Summary
This PR changes what Backspace does at the start of a nested block with inline content.
Before, Backspace did these steps:
Now, Backspace does these steps:
Closes #3018
Rationale
This matches what users expect, and it matches Notion. When you delete across a nested list, the text joins the line above. The blocks below keep their nesting (#3018).
Changes
mergeBlockscan merge the first nested block into its parent. The blocks after it stay children of the parent.KeyboardShortcutsExtension: in the Backspace chain, merging comes before un-nesting. Un-nesting is the last step.Impact
Testing
Unit tests in
mergeBlocks.test.tsandKeyboardShortcutsExtension.test.tscover these cases:Screenshots/Video
N/A
Checklist
Additional Notes
The docs do not describe Backspace behaviour, so no docs change is necessary.
Summary by CodeRabbit