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Fix failed to execute 'setEnd' on 'Range' #4720

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@youen-dev youen-dev commented Dec 30, 2024

Here's an old bug that is making a comeback.

What does this PR do / why do we need it?

Which issue(s) this PR fixes?

Fixes #4719

Checklist

  • Added relevant tests or not required (didn't add any, but checked that the current tests are still ok)
  • Didn't break anything

Summary by CodeRabbit

  • Bug Fixes
    • Improved range selection handling to prevent potential out-of-bounds errors when selecting text nodes.

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coderabbitai bot commented Dec 30, 2024

Walkthrough

The pull request modifies the nativeRange method in the WrappedRange class within the src/js/core/range.js file. The change introduces a safety check when setting the end of a W3C range, specifically for text nodes. The new implementation ensures that the end offset does not exceed the length of the text node's data, potentially preventing out-of-bounds errors when working with ranges in text elements.

Changes

File Change Summary
src/js/core/range.js Modified nativeRange() method to add a conditional check for text node end offset

Assessment against linked issues

Objective Addressed Explanation
Fix 'Failed to execute setEnd on Range' [#4719, #3112]
Prevent out-of-bounds errors in range setting

Poem

🐰 In the realm of ranges, where text nodes play,
A rabbit's fix keeps errors at bay
With careful bounds and a gentle hand,
The range now spans exactly as planned!
No more shall setEnd cause such a fright! 🎉

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 9b6754b and 77fbec1.

📒 Files selected for processing (1)
  • src/js/core/range.js (1 hunks)
🔇 Additional comments (1)
src/js/core/range.js (1)

143-143: Preventing out-of-bounds error looks good!

Using Math.min(this.eo, this.ec.data.length) ensures the offset cannot exceed the text node length, which helps avoid the “setEnd” error in Chrome and Edge. This is a straightforward and robust fix.

You might also want to verify whether similar bounds checks are needed elsewhere by searching for other direct or indirect calls to setEnd:

✅ Verification successful

Let me check the surrounding context of these setEnd usages to ensure we have a complete understanding.


No additional bounds checks needed for other setEnd usages

The codebase analysis shows that there are only three usages of setEnd-related methods:

  • The reviewed bounds check in w3cRange.setEnd() which is already fixed
  • setEndPoint('StartToStart',...) which is for IE legacy support and operates differently
  • setEndPoint('EndToEnd',...) which is also for IE legacy support

The bounds check is only needed for the W3C Range implementation (w3cRange.setEnd()) which has been properly fixed. The other usages are for IE's TextRange API which has different semantics and doesn't require similar bounds checking.

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Search for all references to 'setEnd' across the codebase
rg "setEnd"

Length of output: 345


Script:

#!/bin/bash
# Get more context around setEnd usages
rg "setEnd" -B 3 -A 3

Length of output: 1802


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@youen-dev youen-dev changed the base branch from main to develop December 30, 2024 10:20
@youen-dev youen-dev changed the base branch from develop to main December 30, 2024 10:20
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Successfully merging this pull request may close these issues.

Failed to execute 'setEnd' on 'Range' (re-opening issue #3112)
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