Clamp selection text bounds#9
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Pull request overview
This PR hardens SelectionManager.GetSelectionText() against selection coordinates that fall outside the terminal’s column bounds (e.g., pointer drags slightly outside the cell grid), preventing BufferLine.TranslateToString() from being called with negative start indices.
Changes:
- Clamp per-line selection start/end columns to
[0, Cols - 1]before translating selected buffer lines. - Skip translating a line when clamped bounds would be invalid (
startX > endX). - Add unit tests covering negative start columns and columns past the right edge.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| src/XTerm.NET/Selection/SelectionManager.cs | Clamps selection X bounds before translating selection text to avoid out-of-range indices. |
| src/XTerm.NET.Tests/SelectionTests.cs | Adds tests intended to validate clamping behavior for selection text extraction. |
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@copilot resolve the merge conflicts in this pull request |
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Summary
This prevents
SelectionManager.GetSelectionText()from passing out-of-range columns intoBufferLine.TranslateToString().Selection coordinates can come from pointer positions outside the terminal cell grid, for example dragging slightly left of the terminal before copying. A negative start column can currently produce an
IndexOutOfRangeExceptionwhile translating the selected line.The fix clamps start and end columns to the valid terminal column range before translating each selected line.
Validation
dotnet test src\XTerm.NET.slnx