starred/terminal
1
0
Fork 0
mirror of https://github.com/microsoft/terminal.git synced 2026-02-03 21:25:34 +00:00
Code Issues 19.0k Packages Projects Releases 20 Wiki Activity

Cell-edge issues rendering box-drawing characters and colored backgrounds #558

New Issue
Closed
opened 2026-01-30 21:55:13 +00:00 by claunia · 2 comments
claunia commented 2026-01-30 21:55:13 +00:00
Owner
Copy Link

Originally created by @LurkingKiwi on GitHub (Feb 13, 2019).

  • Your Windows build number: (Type ver at a Windows Command Prompt)
    Version 10.0.17134.407, Intel Core i7-7700 embedded graphics, Full HD, 100%
  • What you're doing and what's happening:
    Our console app uses WriteConsoleOutputCharacterW, WriteConsoleOutputAttribute, FillConsoleOutputCharacterW, FillConsoleOutputAttribute etc.
    We draw on-screen boxes and menus using the box-drawing characters. When a sequence of characters is drawn in a single API call, the glyphs are contiguous. If written one at a time in adjacent locations, single pixel (I think) gaps separate the horizontal lines. The right-hand extension in the first image is done char-at-a-time, the horizontals in the tabs were done as single writes.
    We use a green background to indicate entry fields. When no text is written to the field cells, they draw slightly narrower than cells with text.
    I noticed something like this in the past, where writing a field to spaces to erase it then writing something in (or vice-versa, can't remember) left hairlines at the left and right edges of the region in question. This was hidden by carefully sequencing the write operations.
    This behaviour appears on some PCs in our company but not others.
    Previously I thought changing the font size fixed it, but not at present. This may be because the artifacts do not seem to appear for non-Unicode screen drawing using the same font and size.
    Note that choosing properties, font, OK causes the screen to redraw and all lines are contiguous until redrawn by the application when the gaps reappear.
    I normally use Lucida Console 18, but the same effect occurs with Consolas and at other font sizes. The image snippets captured use extra-large fonts for detail.

lucida_36_gaps
lucida_20_wiggles

  • What's wrong / what should be happening instead:
    Line-drawing characters should be contiguous, backgrounds should be uniformly sized.
Originally created by @LurkingKiwi on GitHub (Feb 13, 2019). * Your Windows build number: (Type `ver` at a Windows Command Prompt) Version 10.0.17134.407, Intel Core i7-7700 embedded graphics, Full HD, 100% * What you're doing and what's happening: Our console app uses WriteConsoleOutputCharacterW, WriteConsoleOutputAttribute, FillConsoleOutputCharacterW, FillConsoleOutputAttribute etc. We draw on-screen boxes and menus using the box-drawing characters. When a sequence of characters is drawn in a single API call, the glyphs are contiguous. If written one at a time in adjacent locations, single pixel (I think) gaps separate the horizontal lines. The right-hand extension in the first image is done char-at-a-time, the horizontals in the tabs were done as single writes. We use a green background to indicate entry fields. When no text is written to the field cells, they draw slightly narrower than cells with text. I noticed something like this in the past, where writing a field to spaces to erase it then writing something in (or vice-versa, can't remember) left hairlines at the left and right edges of the region in question. This was hidden by carefully sequencing the write operations. This behaviour appears on some PCs in our company but not others. Previously I thought changing the font size fixed it, but not at present. This may be because the artifacts do not seem to appear for non-Unicode screen drawing using the same font and size. Note that choosing properties, font, OK causes the screen to redraw and all lines are contiguous until redrawn by the application when the gaps reappear. I normally use Lucida Console 18, but the same effect occurs with Consolas and at other font sizes. The image snippets captured use extra-large fonts for detail. ![lucida_36_gaps](https://user-images.githubusercontent.com/47542711/52742509-bc7d2580-303c-11e9-9dcd-2e104a351cd9.png) ![lucida_20_wiggles](https://user-images.githubusercontent.com/47542711/52742514-c2730680-303c-11e9-9d52-d452c870ca63.png) * What's wrong / what should be happening instead: Line-drawing characters should be contiguous, backgrounds should be uniformly sized.
claunia added the Product-ConhostArea-RenderingIssue-BugResolution-Duplicate labels 2026-01-30 21:55:13 +00:00
claunia commented 2026-01-30 21:55:14 +00:00
Author
Owner
Copy Link

@zadjii-msft commented on GitHub (Dec 13, 2021):

You know, I think this is something that just had to get fixed with the new renderer. I believe that Terminal does this a bit better, and a bit worse. I think we're just tracking all the improvements here over in #5897, so I'm gonna close this one out. Sorry it's been left on the backlog so long! /dup #5897

@zadjii-msft commented on GitHub (Dec 13, 2021): You know, I think this is something that just had to get fixed with the new renderer. I believe that Terminal does this a bit better, and a bit worse. I think we're just tracking all the improvements here over in #5897, so I'm gonna close this one out. Sorry it's been left on the backlog so long! /dup #5897
claunia commented 2026-01-30 21:55:14 +00:00
Author
Owner
Copy Link

@ghost commented on GitHub (Dec 13, 2021):

Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!

@ghost commented on GitHub (Dec 13, 2021): Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
⛺ Reserved
A11yCO
A11yMAS
A11ySev1
A11ySev2
A11ySev3
A11yTTValidated
A11yUsable
A11yVoiceAccess
A11yWCAG
Area-Accessibility
Area-AtlasEngine
Area-AzureShell
Area-Build
Area-Build
Area-Chat
Area-CmdPal
Area-CodeHealth
Area-Commandline
Area-CookedRead
Area-DefApp
Area-Extensibility
Area-Fonts
Area-GroupPolicy
Area-i18n
Area-Input
Area-Interaction
Area-Interop
Area-Localization
Area-Output
Area-Performance
Area-Portable
Area-Quality
Area-Remoting
Area-Rendering
Area-Schema
Area-Server
Area-Settings
Area-SettingsUI
Area-ShellExtension
Area-ShellExtension
Area-ShellExtension
Area-Suggestions
Area-Suggestions
Area-TerminalConnection
Area-TerminalControl
Area-Theming
Area-UserInterface
Area-VT
Area-Windowing
Area-WPFControl
AutoMerge
Blocking-Ingestion
Culprit-Centennial
Culprit-WinUI
Disability-All
Disability-Blind
Disability-LowVision
Disability-Mobility
External-Blocked-WinUI3
Fixed
Gathering-Data
good first issue
HCL-E+D
HCL-WindowsTerminal
Help Wanted
Impact-Compatibility
Impact-Compliance
Impact-Correctness
Impact-Visual
In-PR
InclusionBacklog
InclusionBacklog-Windows TerminalWin32
InclusionCommitted-202206
Issue-Bug
Issue-Docs
Issue-Feature
Issue-Feature
Issue-Question
Issue-Samples
Issue-Scenario
Issue-Task
Needs-Attention
Needs-Author-Feedback
Needs-Bisect
Needs-Discussion
Needs-Repro
Needs-Tag-Fix
Needs-Tag-Fix
Needs-Triage
No-Recent-Activity
Priority-0
Priority-1
Priority-2
Priority-3
Product-Cmd.exe
Product-Colortool
Product-Colortool
Product-Colortool
Product-Conhost
Product-Conpty
Product-Meta
Product-Powershell
Product-Terminal
Product-WSL
pull-request
Mirrored from GitHub Pull Request
 Resolution-Answered
Resolution-By-Design
Resolution-Duplicate
Resolution-External
Resolution-Fix-Available
Resolution-Fix-Committed
Resolution-No-Repro
Resolution-Won't-Fix
Severity-Blocking
Severity-Crash
Severity-DataLoss
spam
this-will-be-a-breaking-change
Tracking-External
WindowsTerminal_Win32
Work-Item
zAskModeBug
zInbox-Bug
No Label Area-Rendering Issue-Bug Product-Conhost Resolution-Duplicate
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
claunia
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: starred/terminal#558
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?