handle text selection in GUI terminal for Windows * QWinTerminalImpl.h, QWinTerminalImpl.cpp (QConsolePrivate::posToCell, QConsolePrivate::getSelection, QConsolePrivate::updateSelection): QWinTerminalImpl::mouseMoveEvent, QWinTerminalImpl::mousePressEvent, QWinTerminalImpl::updateSelection QWinTerminalImpl::mouseReleaseEvent): New functions. (QConsolePrivate::m_beginSelection, QConsolePrivate::m_endSelection, QConsolePrivate::m_selection): New variables. (maybeSwapPoints): New static function. (QConsolePrivate::QConsolePrivate): Initialize m_beginSelection and m_endSelection. (QWinTerminalImpl::viewPaintEvent): Draw an overlay for the selection. (QWinTerminalImpl::copyClipboard): Save selection to clipboard. (QWinTerminalImpl::pasteClipboard): Send clipboard text to terminal. Thanks to Michael Goffioul for help with this patch, especially the QConsolePrivate::getSelection function.

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