v3.1.7

修复

• 编辑器：修复过长的下拉菜单溢出屏幕底部、导致滚动条无法拖动的问题。「说话人」筛选菜单和每行的说话人选择器现在会根据触发按钮上下方的可用空间限制高度，超出部分在菜单内部滚动。
• 导入：导入单语字幕（例如只含译文的导出文件）时，MioSub 会询问这段文本应作为原文还是译文，而不再一律当作原文。重新导入只含译文的文件不会再把译文放进原文栏。双语文件的导入行为保持不变。

Fixes

• Editor: Fix long dropdown menus overflowing past the bottom of the screen, which left their scrollbar unreachable. The Speaker filter and the per-row speaker picker now cap their height to the space available above/below the trigger and scroll internally.
• Import: When importing a single-language subtitle (for example a translation-only export), MioSub now asks whether the text is the original or the translation, instead of always treating it as the original. Re-importing a translation-only file no longer puts the translation in the source column. Bilingual files import as before.