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LibGUI: Handle some edge cases in the spanned text drawing algorithm

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This commit makes it skip invalid ranges and whine about overlapping
spans before ignoring them (instead of crashing).
This commit is contained in:
AnotherTest 2021-03-02 09:36:52 +03:30 • committed by Andreas Kling
parent 2089b24ab5
commit 0d17cf121c
1 changed files with 9 additions and 0 deletions
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9
Userland/Libraries/LibGUI/TextEditor.cpp
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@ -531,6 +531,10 @@ void TextEditor::paint_event(PaintEvent& event)
break;
}
auto& span = document().spans()[span_index];
if (!span.range.is_valid()) {
++span_index;
continue;
}
if (span.range.end().line() < line_index) {
dbgln("spans not sorted (span end {}:{} is before current line {}) => ignoring", span.range.end().line(), span.range.end().column(), line_index);
++span_index;
@ -562,6 +566,11 @@ void TextEditor::paint_event(PaintEvent& event)
} else {
span_start = span.range.start().column() - start_of_visual_line;
}
if (span_start < next_column) {
dbgln("span started before the current position, maybe two spans overlap? (span start {} is before current position {}) => ignoring", span_start, next_column);
++span_index;
continue;
}
size_t span_end;
bool span_consumned;
if (span.range.end().line() > line_index || span.range.end().column() >= start_of_visual_line + visual_line_text.length()) {