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From ea66bff2af8466f2bb5acafcc43ac8f79b1f447f Mon Sep 17 00:00:00 2001
From: Fabian Vogt <fabian@ritter-vogt.de>
Date: Tue, 21 Jan 2020 11:55:49 +0100
Subject: Also disable automatic scaling on Qt >= 5.14
Summary:
Applications which set `Qt::AA_EnableHighDpiScaling` use the DPI of the monitor the window is on to calculate an additional scaling factor.
Plasma sets `QT_SCREEN_SCALE_FACTORS` in the environment for manual specification of per-monitor scale, which combined with the automatic scaling may result in double scaling.
To disable the automatic scaling, `QT_AUTO_SCREEN_SCALE_FACTOR=0` has to be set, even on Qt 5.14.
As a side effect, this works around QTBUG-80967 as well.
BUG: 415421
Test Plan: On X11, with a >144dpi monitor and a scaling factor of 2 set manually, scaling was doubled previously. Now it works as expected.
Reviewers: #plasma, apol, davidedmundson, fvogt
Reviewed By: #plasma, davidedmundson, fvogt
Subscribers: acooligan, fvogt, asturmlechner, dfaure, davidedmundson, anthonyfieroni, plasma-devel
Tags: #plasma
Differential Revision: https://phabricator.kde.org/D26185
---
startkde/startplasma.cpp | 2 --
1 file changed, 2 deletions(-)
diff --git a/startkde/startplasma.cpp b/startkde/startplasma.cpp
index 8d88587..4a89878 100644
--- a/startkde/startplasma.cpp
+++ b/startkde/startplasma.cpp
@@ -222,11 +222,9 @@ void runEnvironmentScripts()
void setupPlasmaEnvironment()
{
-#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
//Manually disable auto scaling because we are scaling above
//otherwise apps that manually opt in for high DPI get auto scaled by the developer AND manually scaled by us
qputenv("QT_AUTO_SCREEN_SCALE_FACTOR", "0");
-#endif
qputenv("KDE_FULL_SESSION", "true");
qputenv("KDE_SESSION_VERSION", "5");
--
cgit v1.1
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