Suggestion: collapse unchanged regions in diff
Problem
When viewing a diff (2 pane or inline) it would be useful to collapse the unchanged lines. This helps focus in on just the changes, especially when the changes are few an spread out.
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1 Fix
Implement Collapsible Unchanged Regions in Diff View
The current diff viewer does not provide a mechanism to collapse unchanged lines, which leads to a cluttered interface when changes are minimal or dispersed. This is due to the lack of a user interface feature that recognizes and groups unchanged lines, making it difficult for users to focus on significant modifications.
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- 1
Identify Unchanged Lines
Modify the diff parsing algorithm to identify unchanged lines between the two versions of the file. This will involve comparing each line and marking those that are identical.
javascriptconst unchangedLines = []; for (let i = 0; i < oldLines.length; i++) { if (oldLines[i] === newLines[i]) { unchangedLines.push(i); } } - 2
Group Unchanged Lines
Create a data structure to group the unchanged lines together. This will help in rendering them as collapsible sections in the UI.
javascriptconst groupedLines = []; let currentGroup = []; unchangedLines.forEach((line, index) => { if (currentGroup.length === 0 || line === currentGroup[currentGroup.length - 1] + 1) { currentGroup.push(line); } else { groupedLines.push(currentGroup); currentGroup = [line]; } }); if (currentGroup.length > 0) groupedLines.push(currentGroup); - 3
Update UI to Render Collapsible Sections
Modify the diff viewer's rendering logic to include collapsible sections for the grouped unchanged lines. This will involve adding event listeners for toggling the visibility of these sections.
javascriptfunction renderDiff(diff) { diff.forEach(section => { if (section.isUnchanged) { createCollapsibleSection(section); } else { renderLine(section); } }); } - 4
Test Collapsible Functionality
Conduct thorough testing of the new collapsible functionality to ensure that it works correctly across various scenarios, including files with no changes, many changes, and mixed changes.
javascriptdescribe('Collapsible Unchanged Regions', () => { it('should collapse unchanged lines correctly', () => { // Test implementation here }); });
Validation
To confirm the fix worked, open the diff viewer and check if unchanged lines are grouped and can be collapsed. Test with multiple files to ensure consistent behavior and that the collapsible feature does not interfere with the display of changed lines.
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Environment
Submitted by
Alex Chen
2450 rep