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bug-fix: findFirstVisibleBlock() return invalid block when fails

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A huge block as the last block may lead to failure to find first visible
block.
This commit is contained in:
Le Tan 2017-09-16 15:07:31 +08:00
parent 2b78711eb4
commit 26d14f81d5
1 changed files with 5 additions and 2 deletions
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7
src/vedit.cpp
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@ -1021,6 +1021,10 @@ void VEdit::lineNumberAreaPaintEvent(QPaintEvent *p_event)
QAbstractTextDocumentLayout *layout = document()->documentLayout();
QTextBlock block = firstVisibleBlock();
if (!block.isValid()) {
return;
}
int blockNumber = block.blockNumber();
int offsetY = contentOffsetY();
QRectF rect = layout->blockBoundingRect(block);
@ -1196,8 +1200,7 @@ QTextBlock VEdit::firstVisibleBlock()
block = block.next();
}
Q_ASSERT(false);
return doc->begin();
return QTextBlock();
}
int LineNumberArea::calculateWidth() const