Adriano Machado created CAMEL-23818:
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Summary: camel tui: Actions menu (F2) leaves stray characters when
scrolling over emoji rows
Key: CAMEL-23818
URL: https://issues.apache.org/jira/browse/CAMEL-23818
Project: Camel
Issue Type: Bug
Affects Versions: 4.20.0
Reporter: Adriano Machado
h3. Summary
In "camel tui", opening the Actions menu (F2) and scrolling through it with the
arrow keys leaves stray characters on screen after closing the menu without
selecting an action. The affected rows are "Start/Stop Tape Recording" and
"Show Keystrokes": moving the selection over them shifts the text one column to
the left and leaves leftover letters behind.
h3. Root cause
These are the only rows whose icon is an emoji presentation sequence (a
text-default base glyph followed by Variation Selector-16, U+FE0F):
* Start/Stop Tape Recording: U+23FA / U+23F9 + U+FE0F
* Show/Hide Keystrokes: U+2328 + U+FE0F
They render 2 columns wide in terminals, but the TUI library (TamboUI) measures
them as 1 column: CharWidth.of(String) sums base(1)+VS16(0), and
Buffer.setString
places the glyph in a single cell without a continuation cell. The terminal's
2-wide glyph then drifts one column out of sync with the buffer, and the redraw
diff leaves ghost characters. Rows using regular wide emoji are unaffected.
h3. Fix
Root cause fixed upstream in TamboUI:
https://github.com/tamboui/tamboui/pull/388
(base+VS16 now counts as width 2 and reserves a continuation cell).
A temporary Camel-side workaround in ActionsPopup.renderActionsMenu swaps the
three labels to unambiguous 2-wide emoji until a fixed TamboUI release is
adopted
(bump tamboui-version in parent/pom.xml), after which the workaround can be
reverted.
h3. Affects
camel-jbang TUI (camel-jbang-plugin-tui), 4.21.0-SNAPSHOT
_Reported by Claude Code on behalf of Adriano Machado._
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