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LibGUI: Fix TextEditor crashing when selecting a blank line

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Previously, the TextEditor would crash when selecting a line with
no codepoints due to a null dereference, so this patch makes sure
there is actually any text to render before giving it to the painter.
This commit is contained in:
FalseHonesty 2020-05-29 14:10:36 -04:00 • committed by Andreas Kling
parent 2a241a11bb
commit b0b03c52af
1 changed files with 7 additions and 5 deletions
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12
Libraries/LibGUI/TextEditor.cpp
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@ -498,12 +498,14 @@ void TextEditor::paint_event(PaintEvent& event)
painter.fill_rect(selection_rect, background_color); painter.fill_rect(selection_rect, background_color);
Utf32View visual_selected_text { if (visual_line_text.codepoints()) {
visual_line_text.codepoints() + start_of_selection_within_visual_line, Utf32View visual_selected_text {
end_of_selection_within_visual_line - start_of_selection_within_visual_line visual_line_text.codepoints() + start_of_selection_within_visual_line,
}; end_of_selection_within_visual_line - start_of_selection_within_visual_line
};
painter.draw_text(selection_rect, visual_selected_text, Gfx::TextAlignment::CenterLeft, text_color); painter.draw_text(selection_rect, visual_selected_text, Gfx::TextAlignment::CenterLeft, text_color);
}
} }
} }
++visual_line_index; ++visual_line_index;