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Amend [2dcb7300/lyxgit]
Avoid a crash by checking that a cell is not empty before accessing its content.
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@ -1113,10 +1113,10 @@ void InsetMathMacro::write(WriteStream & os) const
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// delimiter-size-modifier macro (see #10497 and #11346)
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bool braced = false;
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size_type last = cell(i).size() - 1;
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if (cell(i)[last].nucleus()->asUnknownInset()) {
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if (cell(i).size() && cell(i)[last].nucleus()->asUnknownInset()) {
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latexkeys const * l = in_word_set(cell(i)[last].nucleus()->name());
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braced = (l && l->inset == "big");
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} else if (cell(i)[0].nucleus()->asScriptInset()) {
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} else if (cell(i).size() && cell(i)[0].nucleus()->asScriptInset()) {
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braced = cell(i)[0].nucleus()->asScriptInset()->nuc().empty();
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}
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if (braced)
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