QGuiApplication: move two static variables from DATA to BSS

The {mouse,touch}DoubleXDistance variables were initialized to -1,
which forces them into the DATA segments.

But this value is completely unused, since these variables are also
set in initThemeHints(), called from QGuiApplicationPrivate::init(),
before their only user, QGuiApplicationPrivate::processMouseEvent(),
can possibly execute.

By changing the default value to 0, then, we allow the compiler to
place these variables into the BSS segment.

Change-Id: I86144559ee2410b844f70a4f2499c8d3140d14cf
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 55a7c8027b..b1e4c0e882 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -179,8 +179,8 @@ QPalette *QGuiApplicationPrivate::app_pal = nullptr;        // default applicati
 
 Qt::MouseButton QGuiApplicationPrivate::mousePressButton = Qt::NoButton;
 
-static int mouseDoubleClickDistance = -1;
-static int touchDoubleTapDistance = -1;
+static int mouseDoubleClickDistance = 0;
+static int touchDoubleTapDistance = 0;
 
 QWindow *QGuiApplicationPrivate::currentMousePressWindow = nullptr;