C.<p>Just ran into a brutal <a href="https://mindly.social/tags/UI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>UI</span></a> / <a href="https://mindly.social/tags/UX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>UX</span></a> problem in LibreOffice Calc, on a Debian bookworm system, fully up to date.</p><p>1. Decide to print spreadsheet<br>2. Open print dialog<br>3. Preview is in the left pane, options in the right.<br>4. Scroll down in the options pane to find an option near the bottom.<br>5. Change setting, or not.<br>6. Scroll back up to the top of the options pane, using the pointing device vertical scroll wheel.<br>7. If the "number of copies" scrollbox happens to pass under the mouse pointer, it will rapidly increase the number of copies. It's not particularly obvious this is happening; it's easy to miss the value is changing.<br>8. Move the mouse pointer slightly up and scrolling the options pane continues.<br>9. Click "print".</p><p>Voila! 23 copies of what you wanted to print a single copy of.</p><p>I actually ran into this while trying to debug a totally different UI / UX bug 😱 </p><p><a href="https://mindly.social/tags/LibreOffice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>LibreOffice</span></a> <a href="https://mindly.social/tags/LibreOfficeCalc" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>LibreOfficeCalc</span></a> <a href="https://mindly.social/tags/Calc" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Calc</span></a> <a href="https://mindly.social/tags/spreadsheet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>spreadsheet</span></a> <a href="https://mindly.social/tags/linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>linux</span></a> <a href="https://mindly.social/tags/Debian" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Debian</span></a> <a href="https://mindly.social/tags/bookworm" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>bookworm</span></a> <a href="https://mindly.social/tags/printing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>printing</span></a> <a href="https://mindly.social/tags/CUPS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CUPS</span></a> <a href="https://mindly.social/tags/OpenSource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>OpenSource</span></a> <a href="https://mindly.social/tags/FreeSoftware" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>FreeSoftware</span></a></p>