https://bugs.kde.org/show_bug.cgi?id=523118
Bug ID: 523118
Summary: SE_ItemViewItemText: aba0f922b unconditionally narrows
text rect by 8px, causing label elision in list/tree
views
Classification: Plasma
Product: Breeze
Version First 6.7.3
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: QStyle
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
DESCRIPTION
Source commit:
commit aba0f922b7b872caa3043d0cfe43eec374aba431
Author: Akseli Lahtinen
Date: 2026-02-25
Subject: Make viewItemPrimitive rounded like in QtQuick style (VDG issue #94)
https://invent.kde.org/plasma/breeze/-/commit/aba0f922b7b872caa3043d0cfe43eec374aba431
This bug report does not propose reverting the rounded highlight geometry
introduced by
that commit. The behavior described here is limited to two lines added to
`SE_ItemViewItemText` as part of the same change.
Those two lines appear in the `SE_ItemViewItemText` case in
`Style::subElementRect()` (`kstyle/breezestyle.cpp`):
case SE_ItemViewItemText: {
auto viewItem = qstyleoption_cast<const QStyleOptionViewItem *>(option);
QRect rect = ParentStyleClass::subElementRect(element, option, widget);
if (viewItem) {
const QMargins margins = _helper->itemViewItemMargins(viewItem);
rect.setRight(rect.right() - margins.right() -
Metrics::ItemView_ItemPaddingWidth); // ← aba0f922b
rect.setLeft(rect.left() + margins.left() +
Metrics::ItemView_ItemPaddingWidth); // ← aba0f922b
rect.moveTop(rect.top() + margins.top() - margins.bottom());
}
return rect;
}
At 6.7.3 metric values (`ItemView_ItemMarginLeft/Right = 2px`,
`ItemView_ItemPaddingWidth = 2px`), these two lines discard 4px from each side
of the text rect — 8px total — unconditionally, at every column width.
Analysis
The rounded highlight rect introduced by aba0f922b applies its own inset during
painting. The two `SE_ItemViewItemText` lines above apply an additional inset
to
the text rect — 8px total at 6.7.3 metric values — beyond whatever space Qt's
base
class has already reserved for check indicators and decorations
(`SE_ItemViewItemCheckIndicator`, `SE_ItemViewItemDecoration`). The result is
that
the text rect is 8px narrower than the column width the application measured
when
sizing its labels, causing visible elision.
The `moveTop` adjustment on the line below (vertical centering within the
asymmetric
rounded highlight geometry) is not part of the proposed change.
STEPS TO REPRODUCE
1. Install plasma-breeze 6.7.3 (or any release after 2026-02-25)
2. Launch any Qt5 / Qt6 application in a KDE session (Breeze style active)
3. Open a dialog or view with a list/tree widget with narrow columns
4. Observe lable elision in column text that should fit at the available width
OBSERVED RESULT
A standalone probe created to measures `SE_ItemViewItemText` width against the
full item rect
across multiple column widths and three styles:
Unpatched 6.7.3 (Breeze):
itemWidth=150 textRect=(4,3 142x18) textWidth=142 diff=8
itemWidth=120 textRect=(4,3 112x18) textWidth=112 diff=8
itemWidth=100 textRect=(4,3 92x18) textWidth= 92 diff=8
itemWidth= 80 textRect=(4,3 72x18) textWidth= 72 diff=8
Fusion (same Qt, same session, unmodified):
itemWidth=150 textRect=(0,3 150x18) textWidth=150 diff=0
itemWidth=120 textRect=(0,3 120x18) textWidth=120 diff=0
itemWidth=100 textRect=(0,3 100x18) textWidth=100 diff=0
itemWidth= 80 textRect=(0,3 80x18) textWidth= 80 diff=0
Breeze gives `diff=8` at every column width, including 80px where the loss is
10% of available text space. Fusion and Windows both give `diff=0`.
EXPECTED RESULT
Breeze produces no narrowing of list/tree widgets, e.g. diff=0
SOFTWARE/OS VERSIONS
Operating System: Fedora 43 Workstation X86_64
KDE Plasma Version: 6.7.3
KDE Frameworks Version: 6.28.0
Qt Version: Qt5: 5.15.18 and Qt6: 6.10.3
ADDITIONAL INFORMATION
Affected applications (confirmed)
All three are Qt5 applications that inherit Breeze via
`QT_QPA_PLATFORMTHEME=kde`
→ `kdeglobals` → `breeze5.so`. None select Breeze explicitly in their own code.
- **KeePassXC 2.7.x** — entry edit dialog sidebar
(Entry/Advanced/Icon/Auto-Type/Properties
tabs): all five labels elide under stock 6.7.3
- **GoldenDict** — word list pane: multi-word entries ("Crab-eating macaque",
"Crab-lipped spider orchid") truncate at default pane width
- **SMPlayer** — Preferences sidebar when Style is set to Breeze:
General/Drives/
Performance/Interface and others all elide
**Strongest isolation**: switching SMPlayer between Style=Fusion and
Style=Breeze in
the same running process reproduces and eliminates the elision without
restarting,
confirming the behavior is in the Breeze style plugin rather than the
application.
Qt6 scope
`kstyle/breezestyle.cpp` is compiled twice from the same source — once as
`breeze5.so`
(Qt5) and once as `breeze6.so` (Qt6). Both carry the identical
`SE_ItemViewItemText`
code. Qt6 applications using Breeze on a KDE session are equally affected.
Proposed fix
Remove the two horizontal-narrowing lines. The `moveTop` adjustment is
unchanged.
--- a/kstyle/breezestyle.cpp
+++ b/kstyle/breezestyle.cpp
@@ -1062,8 +1062,6 @@ QRect Style::subElementRect(SubElement element, ...)
QRect rect = ParentStyleClass::subElementRect(element, option,
widget);
if (viewItem) {
const QMargins margins = _helper->itemViewItemMargins(viewItem);
- rect.setRight(rect.right() - margins.right() -
Metrics::ItemView_ItemPaddingWidth);
- rect.setLeft(rect.left() + margins.left() +
Metrics::ItemView_ItemPaddingWidth);
rect.moveTop(rect.top() + margins.top() - margins.bottom());
}
After applying this patch, Breeze `SE_ItemViewItemText` gives `diff=0` at all
tested
column widths — matching Fusion and Windows exactly. The rounded highlight
geometry
is unaffected.
A partial alternative (retain `itemViewItemMargins`, remove only
`ItemView_ItemPaddingWidth`)
was also tested. It reduces the per-side discard from 4px to 2px (diff=4
total), but
at default column widths in KeePassXC and SMPlayer this still causes visible
elision.
The full removal (Patch 1 above) is the recommendation.
Full evidence
I have written an extensive write up with AI Assistant Claude Code and
published all
of my notes, the Qt probes, patches, screenshots, analysis, and findings to:
https://github.com/rallenh/breeze-itemview-text-elision
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