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[PR #15707] Fix horizontal scrolling bugs in AtlasEngine/DxEngine #30708

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opened 2026-01-31 09:42:29 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:42:29 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/15707

State: closed
Merged: Yes

This commit fixes a number of issues around horizontal scrolling.
DxEngine only had one bug, where the clip rect would cause any content
outside of the actual viewport to be invisible. AtlasEngine had more
bugs, mostly around the conversion from textbuffer-relative coordinates
to viewport-relative coordinates, since AtlasEngine stores things like
the cursor position, attributes, etc., relative to the viewport.

It also renames cellCount to viewportCellCount, because I realized
that it might have to deal with a textBufferCellCount or similar in
the future. I hope that the new name is more descriptive of what it
refers to.

Future improvements to AtlasEngine in particular would be to not copy
the entire Settings struct every time the horizontal scroll offset
changes, and to trim trailing whitespace before shaping text.

This is in preparation for #1860

Validation Steps Performed

  • Patch RenderingTests to run in the main (and not alt) buffer
  • Horizontal scrolling of line renditions and attributes works ✅
  • Selection retains its position (mostly) ✅
**Original Pull Request:** https://github.com/microsoft/terminal/pull/15707 **State:** closed **Merged:** Yes --- This commit fixes a number of issues around horizontal scrolling. DxEngine only had one bug, where the clip rect would cause any content outside of the actual viewport to be invisible. AtlasEngine had more bugs, mostly around the conversion from textbuffer-relative coordinates to viewport-relative coordinates, since AtlasEngine stores things like the cursor position, attributes, etc., relative to the viewport. It also renames `cellCount` to `viewportCellCount`, because I realized that it might have to deal with a `textBufferCellCount` or similar in the future. I hope that the new name is more descriptive of what it refers to. Future improvements to AtlasEngine in particular would be to not copy the entire `Settings` struct every time the horizontal scroll offset changes, and to trim trailing whitespace before shaping text. This is in preparation for #1860 ## Validation Steps Performed * Patch `RenderingTests` to run in the main (and not alt) buffer * Horizontal scrolling of line renditions and attributes works ✅ * Selection retains its position (mostly) ✅
claunia added the pull-request label 2026-01-31 09:42:29 +00:00
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Reference: starred/terminal#30708
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