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Make BufferView::singeParUpdate more robust

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In some cases, it might happen that this method is called with no
metrics or position known for the current paragraph.

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) is the method that sets
everything right with minimal effort.

(cherry picked from commit 89ab9eb569)
This commit is contained in:
Jean-Marc Lasgouttes 2024-07-01 23:56:33 +02:00
parent f4364c7593
commit aadf3d8a5d
1 changed files with 16 additions and 9 deletions
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25
src/BufferView.cpp
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@ -564,10 +564,12 @@ void BufferView::processUpdateFlags(Update::flags flags)
// are not already redrawing all).
// We handle this before FitCursor because the later will require
// correct metrics at cursor position.
if (!(flags & Update::ForceDraw)
&& (flags & Update::SinglePar)
&& !singleParUpdate())
updateMetrics(true);
if (!(flags & Update::ForceDraw) && (flags & Update::SinglePar)) {
if (singleParUpdate())
updateMetrics(false);
else
updateMetrics(true);
}
// Then make sure that the screen contains the cursor if needed
if (flags & Update::FitCursor) {
@ -3132,6 +3134,10 @@ 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
@ -3149,18 +3155,19 @@ 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");