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Make BufferView::singeParUpdate more robust

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In some cases, it might happen that this method is called in cases
where no metrics is know for the current paragraph or where its
position is not set.

Take care of these cases to avoid assertions.

Remove setting of inset positions in the method, but make sure that
updateMetrics(false) is always called to get everything right.

In the new code, updateMetrics(bool) os the method that sets
everything right with minimal effort.
This commit is contained in:
Jean-Marc Lasgouttes 2024-07-01 23:56:33 +02:00
parent 2bdd691130
commit 89ab9eb569
1 changed files with 13 additions and 6 deletions
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19
src/BufferView.cpp
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@ -567,7 +567,9 @@ void BufferView::processUpdateFlags(Update::flags flags)
* correct metrics at cursor position.
*/
else if ((flags & Update::SinglePar) && !(flags & Update::ForceDraw)) {
if (!singleParUpdate())
if (singleParUpdate())
updateMetrics(false);
else
updateMetrics(true);
}
else if (flags & Update::ForceDraw)
@ -3150,6 +3152,10 @@ bool BufferView::singleParUpdate()
if (d->inlineCompletionPos_.fixIfBroken())
d->inlineCompletionPos_ = DocIterator();
if (!tm.contains(pit)) {
LYXERR(Debug::PAINTING, "SinglePar optimization failed: no known metrics");
return false;
}
/* Try to rebreak only the paragraph containing the cursor (if
* this paragraph contains insets etc., rebreaking will
* recursively descend). We need a full redraw if either
@ -3167,18 +3173,19 @@ bool BufferView::singleParUpdate()
tm.redoParagraph(pit);
ParagraphMetrics & pm = tm.parMetrics(pit);
if (pm.height() != old_dim.height()
|| (pm.width() != old_dim.width() && old_dim.width() == tm.width())) {
|| (pm.width() != old_dim.width() && old_dim.width() == tm.width())) {
// Paragraph height or width has changed so we cannot proceed
// to the singlePar optimisation.
LYXERR(Debug::PAINTING, "SinglePar optimization failed.");
LYXERR(Debug::PAINTING, "SinglePar optimization failed: paragraph metrics changed");
return false;
}
// Since position() points to the baseline of the first row, we
// may have to update it. See ticket #11601 for an example where
// the height does not change but the ascent does.
pm.setPosition(pm.position() - old_dim.ascent() + pm.ascent());
tm.updatePosCache(pit);
if (pm.hasPosition())
pm.setPosition(pm.position() - old_dim.ascent() + pm.ascent());
else
LYXERR0("SinglePar optimization succeeded, but no position to update");
LYXERR(Debug::PAINTING, "\ny1: " << pm.top() << " y2: " << pm.bottom()
<< " pit: " << pit << " singlepar: 1");