Merge topic 'revert_dpi_changes'

00a209da Revert "Set VTK DPI in the render window set in QVTKOpenGLWidget"

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Utkarsh Ayachit <utkarsh.ayachit@kitware.com>
Reviewed-by: Marcus D. Hanwell <marcus.hanwell@kitware.com>
Merge-request: !2668

GUISupport/Qt/QVTKOpenGLWidget.cxx

@@ -377,7 +377,6 @@ void QVTKOpenGLWidget::requireRenderWindowInitialization()
   if (this->RenderWindow)
   {
     this->RenderWindow->SetReadyForRendering(false);
-    this->markCachedImageAsDirty();
   }
 }
 
@@ -429,10 +428,6 @@ void QVTKOpenGLWidget::paintGL()
     f->glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
     this->RenderWindow->SetMultiSamples(static_cast<int>(samples));
 
-    // Set the render window's DPI so that graphical elements in charts, etc.
-    // are not super tiny.
-    this->RenderWindow->SetDPI(this->devicePixelRatio() * this->physicalDpiX());
-
     // On OsX (if QSurfaceFormat::alphaBufferSize() > 0) or when using Mesa, we
     // end up rendering fully transparent windows (see through background)
     // unless we fill it with alpha=1.0 (See paraview/paraview#17159).