It seems that the appended trace:

Spends its time copying un-initialized vdev state - from A to B; which yields:

        VCL_GL_INFO( "OpenGLTexture::Binding invalid texture" );

We should avoid that =) fix in progress.

(gdb) bt 20
#0  0x00007fffef1f4612 in OpenGLTexture::Bind() (this=0x2979240) at /data/opt/libreoffice/master/vcl/opengl/texture.cxx:386
#1  0x00007fffef1ed0e2 in OpenGLProgram::SetTexture(rtl::OString const&, OpenGLTexture&) (this=0x1ac9498, rName="sampler", rTexture=...) at /data/opt/libreoffice/master/vcl/opengl/program.cxx:251
#2  0x00007fffef1d51a1 in OpenGLSalGraphicsImpl::DrawTexture(OpenGLTexture&, SalTwoRect const&, bool) (this=0x29797d0, rTexture=..., pPosAry=..., bInverted=false) at /data/opt/libreoffice/master/vcl/opengl/gdiimpl.cxx:1042

    DrawTexture( rImpl.maOffscreenTex, rPosAry );

#3  0x00007fffef1d9856 in OpenGLSalGraphicsImpl::DoCopyBits(SalTwoRect const&, OpenGLSalGraphicsImpl&) (this=0x29797d0, rPosAry=..., rImpl=...) at /data/opt/libreoffice/master/vcl/opengl/gdiimpl.cxx:1649
#4  0x00007fffdcf3394e in X11OpenGLSalGraphicsImpl::copyBits(SalTwoRect const&, SalGraphics*) (this=0x29797d0, rPosAry=..., pSrcGraphics=0x2972880) at /data/opt/libreoffice/master/vcl/opengl/x11/gdiimpl.cxx:65
#5  0x00007fffdcf16d0a in X11SalGraphics::copyBits(SalTwoRect const&, SalGraphics*) (this=0x29796f0, rPosAry=..., pSSrcGraphics=0x2972880) at /data/opt/libreoffice/master/vcl/unx/generic/gdi/salgdi2.cxx:167
#6  0x00007fffdebf7282 in GtkSalGraphics::copyBits(SalTwoRect const&, SalGraphics*) (this=0x29796f0, rPosAry=..., pSrcGraphics=0x2972880) at /data/opt/libreoffice/master/vcl/unx/gtk/salnativewidgets-gtk.cxx:642
#7  0x00007fffef76274b in SalGraphics::CopyBits(SalTwoRect const&, SalGraphics*, OutputDevice const*, OutputDevice const*) (this=0x29796f0, rPosAry=..., pSrcGraphics=0x2972880, pOutDev=0x2978290, pSrcOutDev=0x2978290) at /data/opt/libreoffice/master/vcl/source/gdi/salgdilayout.cxx:589
#8  0x00007fffef7838c3 in VirtualDevice::InnerImplSetOutputSizePixel(Size const&, bool, boost::shared_array<unsigned char> const&) (this=0x2978290, rNewSize=Size = {...}, bErase=false, pBuffer=...) at /data/opt/libreoffice/master/vcl/source/gdi/virdev.cxx:360
#9  0x00007fffef783ae3 in VirtualDevice::ImplSetOutputSizePixel(Size const&, bool, boost::shared_array<unsigned char> const&) (this=0x2978290, rNewSize=Size = {...}, bErase=false, pBuffer=...) at /data/opt/libreoffice/master/vcl/source/gdi/virdev.cxx:399
#10 0x00007fffef783e36 in VirtualDevice::SetOutputSizePixel(Size const&, bool) (this=0x2978290, rNewSize=Size = {...}, bErase=false) at /data/opt/libreoffice/master/vcl/source/gdi/virdev.cxx:446

** This looks like an abomination:
	+ saving and restoring crazy stuff [!?] ... why ? ... +

#11 0x00007ffff21a85f7 in sdr::overlay::OverlayManagerBuffered::ImpPrepareBufferDevice() (this=0x2943ee0) at /data/opt/libreoffice/master/svx/source/sdr/overlay/overlaymanagerbuffered.cxx:46
#12 0x00007ffff21a9062 in sdr::overlay::OverlayManagerBuffered::ImpSaveBackground(vcl::Region const&, OutputDevice*) (this=0x2943ee0, rRegion=..., pPreRenderDevice=0x295ff30) at /data/opt/libreoffice/master/svx/source/sdr/overlay/overlaymanagerbuffered.cxx:160
#13 0x00007ffff21aa0b8 in sdr::overlay::OverlayManagerBuffered::completeRedraw(vcl::Region const&, OutputDevice*) const (this=0x2943ee0, rRegion=..., pPreRenderDevice=0x295ff30) at /data/opt/libreoffice/master/svx/source/sdr/overlay/overlaymanagerbuffered.cxx:418
#14 0x00007ffff21ef8f8 in SdrPaintWindow::DrawOverlay(vcl::Region const&) (this=0x23b4000, rRegion=...) at /data/opt/libreoffice/master/svx/source/svdraw/sdrpaintwindow.cxx:335
#15 0x00007ffff2391a9c in SdrPaintView::EndCompleteRedraw(SdrPaintWindow&, bool) (this=0x23b2700, rPaintWindow=..., bPaintFormLayer=true) at /data/opt/libreoffice/master/svx/source/svdraw/svdpntv.cxx:763
#16 0x00007ffff268e26a in FmFormView::EndCompleteRedraw(SdrPaintWindow&, bool) (this=0x23b2700, rPaintWindow=..., bPaintFormLayer=true) at /data/opt/libreoffice/master/svx/source/form/fmview.cxx:477
#17 0x00007ffff2391c34 in SdrPaintView::EndDrawLayers(SdrPaintWindow&, bool) (this=0x23b2700, rPaintWindow=..., bPaintFormLayer=true) at /data/opt/libreoffice/master/svx/source/svdraw/svdpntv.cxx:800
#18 0x00007fffa6f14ee8 in SwViewShell::DLPostPaint2(bool) (this=0x22ac790, bPaintFormLayer=true) at /data/opt/libreoffice/master/sw/source/core/view/viewsh.cxx:245
#19 0x00007fffa6f1be34 in SwViewShell::Paint(OutputDevice&, Rectangle const&) (this=0x22ac790, rRenderContext=..., rRect=Rectangle = {...}) at /data/opt/libreoffice/master/sw/source/core/view/viewsh.cxx:1802
#20 0x00007fffa6604494 in SwCursorShell::Paint(OutputDevice&, Rectangle const&) (this=0x22ac790, rRenderContext=..., rRect=Rectangle = {...}) at /data/opt/libreoffice/master/sw/source/core/crsr/crsrsh.cxx:1278