[0150] 修复演讲模式闪烁#3415
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更新任务文档，记录闪烁问题的根因分析和修复方案。 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
在 Windows 上，演讲模式下 viewport 背景为黑色，但 beamer 幻灯片背景通常为白色。 Qt 在子 widget 重绘前会自动填充 viewport 背景，导致黑色短暂显示后变白，产生闪烁。 修复内容： 1. 进入演讲模式时关闭 viewport 的 autoFillBackground 并设置 WA_OpaquePaintEvent 2. 退出时恢复这些设置 3. 在创建新 backing pixmap 时先用 tm_background 填充，避免未初始化区域显示为黑色 4. 添加单元测试验证 viewport 属性切换 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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