The rendering has been rewritten to use cached GlyphRuns instead
of text layouts. The VTerm specific code was moved into
TerminalSurface.
Change-Id: I10caa3db4ee932414987c9ddae2dcb777dc1f6e7
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
