fix: respect the setting of QT_ENABLE_HIGHDPI_SCALING of the system (#…

…2077)

* fix: respect the setting of QT_ENABLE_HIGHDPI_SCALING of the system

Setting QT_ENABLE_HIGHDPI_SCALING to 1 might not work well in some
cases. Instead of hard-coding it to 1, this commit checks if it is
already set, and if it is empty or not set, then set it to 1. This
allows overriding the QT_ENABLE_HIGHDPI_SCALING to 0 by respecting the
system-wide setting of environment variables.

* fix: move setHighDpiScaleFactorRoundingPolicy out of the check of QT_ENABLE_HIGHDPI_SCALING

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/main.cc

@@ -348,7 +348,10 @@ int main( int argc, char ** argv )
 
 
   //high dpi screen support
-  qputenv( "QT_ENABLE_HIGHDPI_SCALING", "1" );
+  if ( !qEnvironmentVariableIsSet( "QT_ENABLE_HIGHDPI_SCALING" )
+       || qEnvironmentVariableIsEmpty( "QT_ENABLE_HIGHDPI_SCALING" ) ) {
+    qputenv( "QT_ENABLE_HIGHDPI_SCALING", "1" );
+  }
   QApplication::setHighDpiScaleFactorRoundingPolicy( Qt::HighDpiScaleFactorRoundingPolicy::PassThrough );
 
   QHotkeyApplication app( "GoldenDict-ng", argc, argv );