Details
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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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5.9.7, 5.15.2, 6.5.1
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None
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macOS,
Windows
Description
Using a multi-line <pre> tag in a QTextEdit is not handled correctly. All text blocks after the <pre> tag is closed are rendered in no-wrap mode as if they were <pre> tagged. If you then query the html using ::toHtml() you can see all blocks after the multi-line <pre> tag has closed are tagged as <pre> rather than <p>.
This consistently happens with multi-line blocks given the <pre> formatting, either directly using the HTML <pre> tag or by assigning the "style="white-space: pre" to a <p> tag.
I am testing this using PyQt and I have tried on both MacOs and Windows using both Qt5 and Qt6 and the behavior is the same.
Here is a simple program to demonstrate:
from PyQt5.QtWidgets import QApplication, QTextEdit, QVBoxLayout, QWidget
from PyQt5.QtGui import QColor, QTextOption
import sys
class CustomWidget(QWidget):
def __init__(self, *args, **kwargs):
super(CustomWidget, self).__init__(*args, **kwargs)
self.layout = QVBoxLayout()
self.text_edit = QTextEdit()
self.layout.addWidget(self.text_edit)
self.setLayout(self.layout)
app = QApplication(sys.argv)
widget = CustomWidget()
widget.text_edit.append('''<p> Next lines of text should wrap normally normally normally normally normally normally normally normally normally normally normally normally </p>''')
widget.text_edit.append('''<pre style=" white-space: pre; margin-top:0px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'Menlo';"> singe-line pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre </pre>''')
widget.text_edit.append('''<p> Next lines of text should wrap normally normally normally normally normally normally normally normally normally normally normally normally </p>''')
widget.text_edit.append('''<pre>
multi-line pre multi-line pre multi-line pre multi-line pre multi-line pre multi-line pre multi-line pre multi-line pre</pre>''')
widget.text_edit.append('''<p style="white-space: normal;"> Next lines of text should wrap normally normally normally normally normally normally normally normally normally normally normally normally </p>''')
widget.text_edit.append('''<p style="white-space: normal;"> Next lines of text should wrap normally normally normally normally normally normally normally normally normally normally normally normally </p>''')
print(widget.text_edit.toHtml())
widget.show()
sys.exit(app.exec())
The end result looks like the attached file.
toHtml() shows the following is the resulting html created internally:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">
<html><head><meta name="qrichtext" content="1" /><style type="text/css">
p, li { white-space: pre-wrap; }
</style></head><body style=" font-family:'.AppleSystemUIFont'; font-size:13pt; font-weight:400; font-style:normal;">
<p style=" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Next lines of text should wrap normally normally normally normally normally normally normally normally normally normally normally normally </p>
<p style=" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'Menlo';"> singe-line pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre pre </span></p>
<p style=" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Next lines of text should wrap normally normally normally normally normally normally normally normally normally normally normally normally </p>
<p style=" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'Menlo';"> </span></p>
<pre style=" margin-top:0px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'Menlo';">multi-line pre multi-line pre multi-line pre multi-line pre multi-line pre multi-line pre multi-line pre multi-line pre</span></pre>
<pre style=" margin-top:0px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Next lines of text should wrap normally normally normally normally normally normally normally normally normally normally normally normally </pre>
<pre style=" margin-top:0px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Next lines of text should wrap normally normally normally normally normally normally normally normally normally normally normally normally </pre></body></html>
