https://bugs.kde.org/show_bug.cgi?id=394963
--- Comment #6 from Vlad Zagorodniy <vladz...@gmail.com> ---
After taking a look at Fusion widget style source code, here's a patch
to "fix" this bug in some part:
```
>From 8a1b11a4ed6fdd639259d7eea1c04bc926b78483 Mon Sep 17 00:00:00 2001
From: Vlad Zagorodniy <vladz...@gmail.com>
Date: Sat, 2 Jun 2018 23:42:38 +0300
Subject: [PATCH] Fix SpinBox frame rendering with Qt 5.11
---
kstyle/breezestyle.cpp | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/kstyle/breezestyle.cpp b/kstyle/breezestyle.cpp
index 28746216..88042362 100644
--- a/kstyle/breezestyle.cpp
+++ b/kstyle/breezestyle.cpp
@@ -6200,13 +6200,11 @@ namespace Breeze
const auto& palette( option->palette );
const auto& rect( option->rect );
-
- if( option->subControls & SC_SpinBoxFrame )
+ if( spinBoxOption->frame )
{
// detect flat spinboxes
- bool flat( !spinBoxOption->frame );
- flat |= ( rect.height() < 2*Metrics::Frame_FrameWidth +
Metrics::SpinBox_ArrowButtonWidth );
+ const bool flat = ( rect.height() < 2*Metrics::Frame_FrameWidth +
Metrics::SpinBox_ArrowButtonWidth );
if( flat )
{
--
2.17.1
```
Also, Fusion checks whether it should draw arrows or plus/minus as follows:
if (spinBox->buttonSymbols == QAbstractSpinBox::PlusMinus) { ... }
else if (spinBox->buttonSymbols == QAbstractSpinBox::UpDownArrows) { ... }
I hope this will help you.
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