kde-plasma/plasma-workspace: Also disable automatic scaling on Qt>=5.14

KDE-Bug: https://bugs.kde.org/show_bug.cgi?id=415421
Package-Manager: Portage-2.3.84, Repoman-2.3.20
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/kde-plasma/plasma-workspace/files/plasma-workspace-5.17.5-disable-autoscaling-on-qt-5.14.patch b/kde-plasma/plasma-workspace/files/plasma-workspace-5.17.5-disable-autoscaling-on-qt-5.14.patch
new file mode 100644
index 000000000000..114e653df8e1
--- /dev/null
+++ b/kde-plasma/plasma-workspace/files/plasma-workspace-5.17.5-disable-autoscaling-on-qt-5.14.patch
@@ -0,0 +1,47 @@
+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