fix(linux): implement SetTooltip for the system tray - #6017
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setTooltip was a stub on Linux, so the only hover text a tray icon could have was its name — SetLabel doubles as that, and the ToolTip property was published with an empty description. StatusNotifierItem's ToolTip carries a description under the title, which is where a desktop shows the extra line, so SetTooltip fills it in. The property is declared with prop.EmitTrue, so setting it is what tells the host to re-read it; setLabel refreshes it too, since the title half follows the name.
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WalkthroughLinux ChangesLinux system tray tooltip
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The Linux tray tooltip behavior is localized, but a label update can leave the tooltip showing an outdated title on certain connection or notification errors. The change is otherwise mergeable with explicit owner awareness and follow-up to refresh the tooltip immediately after updating the title. Suggested reviewers: Poem
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Inline comments:
In `@v3/pkg/application/systemtray_linux.go`:
- Around line 552-553: Update setLabel so s.updateToolTip() runs immediately
after the successful Title update, before any returns caused by a nil s.conn or
notifier.Emit failure; retain the existing tooltip refresh behavior without
relying on the later path.
In `@v3/UNRELEASED_CHANGELOG.md`:
- Line 26: Update the SystemTray.SetTooltip() changelog entry to append the PR
reference (`#6017`), preserving the existing wording.
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v3/UNRELEASED_CHANGELOG.mdv3/pkg/application/systemtray_linux.go
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setLabel updates Title and then returns if there is no connection or the NewTitle signal fails, so the published ToolTip kept the previous label while Title held the new one. The tooltip follows the title, so it is refreshed as soon as the title is known to have changed.
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Description
SystemTray.SetTooltip()does nothing on Linux:linuxSystemTray.setTooltipis an empty function marked// TBD. The only hover text a tray icon can have is its name, whichSetLabelalready sets, and theToolTipproperty is published with an empty description.StatusNotifierItem's
ToolTipcarries a description under the title — the extra line a desktop shows on hover — soSetTooltipfills that in.The property is declared with
prop.EmitTrue, so setting it is what tells the host to re-read it.setLabelrefreshes it as well, since the title half of the tooltip follows the item's name.No issue filed; found while building a tray-based app.
Type of change
How Has This Been Tested?
Built an app that calls
SetTooltipon its tray item and read the exported StatusNotifierItem property over D-Bus.Before:
After
SetTooltip("Middle-click to play or pause"):The description is also preserved across a later
SetLabel.Debian 13 (trixie), KDE Plasma 6 on Wayland.
Test Configuration
GTK 4.18.6, WebKitGTK 2.52.3, Go 1.25.0,
org.kde.StatusNotifierWatcherprovided by plasmashell.Checklist:
website/src/pages/changelog.mdxwith details of this PR (v3 changelog entries are added automatically)The behaviour is a D-Bus property on a live tray connection, which I could not see a way to cover in a unit test — happy to add one if you can point me at the right seam.
v3/UNRELEASED_CHANGELOG.mdis updated under Fixed, per CONTRIBUTING.md; drop that commit if v3 entries are generated automatically.Summary by CodeRabbit