Remove Qt4 compatibility code

plugins/GigPlayer/PatchesDialog.cpp

@@ -74,11 +74,7 @@ PatchesDialog::PatchesDialog( QWidget * pParent, Qt::WindowFlags wflags )
 	// Soundfonts list view...
 	QHeaderView * pHeader = m_progListView->header();
 	pHeader->setDefaultAlignment( Qt::AlignLeft );
-#if QT_VERSION >= 0x050000
 	pHeader->setSectionsMovable( false );
-#else
-	pHeader->setMovable( false );
-#endif
 	pHeader->setStretchLastSection( true );
 
 	m_progListView->resizeColumnToContents( 0 );	// Prog.

plugins/VstEffect/VstEffectControlDialog.cpp

@@ -272,7 +272,7 @@ void VstEffectControlDialog::showEvent(QShowEvent *_se)
 
 VstEffectControlDialog::~VstEffectControlDialog()
 {
-#if !(QT_VERSION < 0x050000 && defined(LMMS_BUILD_LINUX))
+#ifndef LMMS_BUILD_LINUX
 	if (m_pluginWidget && layout()) {
 		layout()->removeWidget(m_pluginWidget);
 		m_pluginWidget->setParent(nullptr);

plugins/lb302/lb302.cpp

@@ -434,11 +434,7 @@ QString lb302Synth::nodeName() const
 // OBSOLETE. Break apart once we get Q_OBJECT to work. >:[
 void lb302Synth::recalcFilter()
 {
-#if QT_VERSION >= 0x050000
 	vcf.load()->recalc();
-#else
-	vcf->recalc();
-#endif
 
 	// THIS IS OLD 3pole/24dB code, I may reintegrate it.  Don't need it
 	// right now.   Should be toggled by LB_24_RES_TRICK at the moment.
@@ -464,11 +460,7 @@ int lb302Synth::process(sampleFrame *outbuf, const int size)
 	float samp;
 
 	// Hold on to the current VCF, and use it throughout this period
-#if QT_VERSION >= 0x050000
 	lb302Filter *filter = vcf.loadAcquire();
-#else
-	lb302Filter *filter = vcf;
-#endif
 
 	if( release_frame == 0 || ! m_playingNote ) 
 	{
@@ -692,11 +684,7 @@ void lb302Synth::initNote( lb302Note *n)
 
 	if(n->dead ==0){
 		// Swap next two blocks??
-#if QT_VERSION >= 0x050000
 		vcf.load()->playNote();
-#else
-		vcf->playNote();
-#endif
 		// Ensure envelope is recalculated
 		vcf_envpos = ENVINC;
 

plugins/sf2_player/patches_dialog.cpp

@@ -75,11 +75,7 @@ patchesDialog::patchesDialog( QWidget *pParent, Qt::WindowFlags wflags )
 //	pHeader->setResizeMode(QHeaderView::Custom);
 	pHeader->setDefaultAlignment(Qt::AlignLeft);
 //	pHeader->setDefaultSectionSize(200);
-#if QT_VERSION >= 0x050000
 	pHeader->setSectionsMovable(false);
-#else
-	pHeader->setMovable(false);
-#endif
 	pHeader->setStretchLastSection(true);
 
 	m_progListView->resizeColumnToContents(0);	// Prog.

plugins/vst_base/VstPlugin.cpp

@@ -35,17 +35,10 @@
 
 #ifdef LMMS_BUILD_LINUX
 #	include <QX11Info>
-#	if QT_VERSION < 0x050000
-#		include <QX11EmbedContainer>
-#	else
-#		include "X11EmbedContainer.h"
-#		include <QWindow>
-#	endif
+#	include "X11EmbedContainer.h"
 #endif
 
-#if QT_VERSION >= 0x050000
-#	include <QWindow>
-#endif
+#include <QWindow>
 
 #include <QDomDocument>
 

plugins/zynaddsubfx/CMakeLists.txt

@@ -122,11 +122,6 @@ ELSE()
 ENDIF()
 TARGET_LINK_LIBRARIES(ZynAddSubFxCore zynaddsubfx_nio ${FFTW3F_LIBRARIES} ${QT_LIBRARIES} -lz -lpthread)
 
-# required libs for debug msys builds
-IF(LMMS_BUILD_MSYS AND CMAKE_BUILD_TYPE STREQUAL "Debug")
-	TARGET_LINK_LIBRARIES(ZynAddSubFxCore QtCore4 QtGui4 QtXml4)
-ENDIF()
-
 TARGET_LINK_LIBRARIES(ZynAddSubFxCore Qt5::Widgets Qt5::Xml)
 
 IF(LMMS_BUILD_WIN32)