Fix unused variables

In almost all cases these can be removed. The only exception is in
ShaderViewer.cpp, where regIdx should have been used.

qrenderdoc/Windows/BufferViewer.cpp

@@ -2264,8 +2264,6 @@ void BufferViewer::configureMeshColumns()
   else
     m_ModelVSIn->numRows = draw->numIndices;
 
-  QVector<BoundVBuffer> vbs = m_Ctx.CurPipelineState().GetVBuffers();
-
   Viewport vp = m_Ctx.CurPipelineState().GetViewport(0);
 
   m_Config.fov = ui->fovGuess->value();

qrenderdoc/Windows/Dialogs/TextureSaveDialog.cpp

@@ -529,7 +529,6 @@ void TextureSaveDialog::on_browse_clicked()
   QString filename =
       RDDialog::getSaveFileName(this, tr("Save Texture As"), QString(), filter, selectedFilter);
 
-  QFileInfo checkFile(filename);
   if(!filename.isEmpty())
   {
     ui->filename->setText(filename);

qrenderdoc/Windows/MainWindow.cpp

@@ -1723,7 +1723,6 @@ void MainWindow::on_action_Settings_triggered()
 void MainWindow::on_action_View_Documentation_triggered()
 {
   QFileInfo fi(QGuiApplication::applicationFilePath());
-  QDir curDir = QFileInfo(QGuiApplication::applicationFilePath()).absoluteDir();
 
   if(fi.absoluteDir().exists(lit("renderdoc.chm")))
     QDesktopServices::openUrl(

qrenderdoc/Windows/ShaderViewer.cpp

@@ -515,7 +515,7 @@ void ShaderViewer::debugShader(const ShaderBindpointMapping *bind, const ShaderR
             s.systemValue == ShaderBuiltin::Undefined ? QString::number(s.regIndex) : lit("-");
 
         ui->inputSig->addTopLevelItem(new RDTreeWidgetItem(
-            {name, semIdx, QString::number(s.regIndex), TypeString(s), ToQStr(s.systemValue),
+            {name, semIdx, regIdx, TypeString(s), ToQStr(s.systemValue),
              GetComponentString(s.regChannelMask), GetComponentString(s.channelUsedMask)}));
       }
 

qrenderdoc/Windows/TimelineBar.cpp

@@ -858,7 +858,6 @@ void TimelineBar::paintMarkers(QPainter &p, const QVector<Marker> &markers,
     if(elided == tooshort)
       elided = QString();
 
-    QRectF textRect = r;
     r.setLeft(qRound(r.left() + margin));
 
     p.drawText(r, elided, to);