Unified Diff: Severe performance degradation when editing with folded unchanged regions
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Nadie ha tomado este issue todavía.
Evaluación
- Dificultad
- 4/5
- Tiempo estimado
- 3-5 días
- Aptitud para principiantes
- 45/100
- Tipo de issue
- Error
- Claridad
- Bastante claro
- Estado de actividad
- Activo
- Stack tecnológico
- java
- Área
- performance
Línea de trabajo
Start with the Unified Diff preference and the folding mechanism described in the report, then profile typing with many unchanged regions folded. Investigate whether annotation recomputation, projection updates, or diff recalculation runs on each document change. Done means normal input responsiveness with many folded regions and coverage for this reproduction scenario.
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Descripción
Problem
When the preference "Fold unchanged regions, keeping a few lines of context around each change" is enabled and many unchanged regions are folded, editing the document becomes very slow. User input is barely registered or has a significant delay, making the editor practically unusable in this state.
Steps to Reproduce
- Enable Unified Diff in Preferences > Compare/Patch.
- Enable "Fold unchanged regions, keeping a few lines of context around each change".
- Open a file with many changes so that a large number of unchanged regions are folded.
- Start typing / editing in the editor.
Expected Behavior
Editing performance should be unaffected by the number of folded regions. User input should be processed at normal speed regardless of the folding state.
Actual Behavior
The editor becomes very slow. Keystrokes are delayed or dropped, making editing effectively impossible when many regions are folded.
Notes
This issue requires root-cause analysis. The folding mechanism likely triggers expensive recalculations (e.g. annotation recomputation, projection updates, or diff recalculation) on every document change, which does not scale with large numbers of folded regions.
- Lenguaje dominante
- Java
- Estrellas
- 165
- Forks
- 174
- Merge medio
- 3 d 6 h
- PR fusionados (30 d)
- 44
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Primeros pasos
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