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GTextEditor: set_cursor() should gracefully handle old cursor being invalid.

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Since set_cursor() may be called after arbitrary document changes, it can't
rely on the old cursor being valid. To make things simple, if the old cursor
is on a line no longer in the document, just repaint the whole editor.
This commit is contained in:
Andreas Kling
2019-05-06 22:04:53 +02:00
parent 72cbcd8e98
commit 26110f7753
1 changed files with 4 additions and 1 deletions
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5
LibGUI/GTextEditor.cpp
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@@ -688,7 +688,10 @@ void GTextEditor::set_cursor(const GTextPosition& position)
ASSERT(position.line() < m_lines.size());
ASSERT(position.column() <= m_lines[position.line()]->length());
if (m_cursor != position) {
auto old_cursor_line_rect = line_widget_rect(m_cursor.line());
// NOTE: If the old cursor is no longer valid, repaint everything just in case.
auto old_cursor_line_rect = m_cursor.line() < m_lines.size()
? line_widget_rect(m_cursor.line())
: rect();
m_cursor = position;
m_cursor_state = true;
scroll_cursor_into_view();