From caabd5e0ebc8ebcd68c71bb0aba072b134f58acb Mon Sep 17 00:00:00 2001
From: Bharadwaj Raju <bharadwaj.raju777@protonmail.com>
Date: Tue, 1 Feb 2022 21:34:48 +0000
Subject: [PATCH] kdecoration: Use proper easing curves for shadow animations

Animating from invisible to visible should be OutCubic, and from visible to
invisible should be InCubic. https://develop.kde.org/hig/style/animations


(cherry picked from commit e5c6a3214d780cff22f524a0150be1c18ea978df)
---
 kdecoration/breezedecoration.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kdecoration/breezedecoration.cpp b/kdecoration/breezedecoration.cpp
index c1a238d9..5e702fd6 100644
--- a/kdecoration/breezedecoration.cpp
+++ b/kdecoration/breezedecoration.cpp
@@ -222,7 +222,7 @@ namespace Breeze
 
         m_shadowAnimation->setStartValue( 0.0 );
         m_shadowAnimation->setEndValue( 1.0 );
-        m_shadowAnimation->setEasingCurve( QEasingCurve::InCubic );
+        m_shadowAnimation->setEasingCurve( QEasingCurve::OutCubic );
         connect(m_shadowAnimation, &QVariantAnimation::valueChanged, this, [this](const QVariant& value) {
             m_shadowOpacity = value.toReal();
             updateShadow();
@@ -301,6 +301,7 @@ namespace Breeze
 
             const auto c = client().toStrongRef();
             m_shadowAnimation->setDirection( c->isActive() ? QAbstractAnimation::Forward : QAbstractAnimation::Backward );
+            m_shadowAnimation->setEasingCurve( c->isActive() ? QEasingCurve::OutCubic : QEasingCurve::InCubic );
             if( m_shadowAnimation->state() != QAbstractAnimation::Running ) m_shadowAnimation->start();
 
         } else {