stb_textedit: fix out-of-bounds selection when performing undo/redo while text is selected #1586
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…hile text is selected
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Fixes #1103. Reproduce the bug by selecting all text, then performing an undo/redo operation that deletes some part of it. That will result in a value of state->select_end beyond STB_TEXTEDIT_STRINGLEN(), leading to crashes in code that use the library.