What's Changed
新功能
1.截图工具栏新增水印工具，可输入多行文字和时间占位符，平铺或放在 7 个位置之一；设置里可开启「自动加水印」（#53）。
2.钉图新增鼠标穿透和锁定，并新增独立的「钉图」设置页，可调默认透明度、缩放步长和缩放锚点等。
3.钉图工具栏可自定义：右侧新增「…」和「调整」，排布与截图工具栏分开设置；聚光灯、水印也能在钉图里使用（#89）。
改进
OCR 结果窗口新增排版选项（自动、去掉换行、保留每一行）、去空格、标点半角/全角和关闭时复制文字；识别窗口和翻译窗口可置顶（#41）。
剪贴板的「特殊粘贴」菜单可自定义顺序与显隐（#71）。
自动保存拆成「截图完成时」和「生成钉图时」两个开关，新增「加了标注或水印时另存一张原图」。
截图、钉图和 GIF 回放的「保存」对话框默认打开设置里的保存目录（#90）。
全屏十字线只在框选时显示，选区确认后绘制工具改用普通十字光标（#87）。
文字工具的光标改成 I 形（#49）。
截图写入剪贴板改到后台线程，界面不再等图片编码。
工具栏图标按实际像素渲染，不再发虚；设置页的图标与配色统一，翻译页把翻译引擎放到最上方。
修复
修复钉图里的对话框（水印输入、调整排布、取色）开着时，鼠标停在钉图上按 Esc 会退出编辑、再按一次把钉图关掉的问题。
修复文字框边缘显示可拖动的光标，按下去却变成选字的问题。
修复深色主题下 GIF 录制浮层菜单文字看不清的问题。
修复剪贴板窗口贴近屏幕右边时，悬停预览盖住光标造成闪烁的问题。
修复剪贴板多选右键菜单在非中文界面下缺少翻译的问题。
New
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The screenshot toolbar gains a watermark tool: multi-line text with time placeholders, tiled or placed in one of 7 positions; turn on "Auto watermark" in Settings to add it to every screenshot (#53).
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Pinned images support mouse click-through and locking, and there is a new "Pin" settings page for the default opacity, zoom step, zoom anchor and more.
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The pin toolbar is customizable: "…" and "Adjust" are added on the right, its layout is separate from the screenshot toolbar, and Spotlight and Watermark can be used on pins too (#89).
Improvements
The OCR result window gains layout options (Auto, Remove line breaks, Keep every line), space removal, half-width/full-width punctuation and copy-on-close; the recognition and translation windows can be set always on top (#41).
The clipboard's Special Paste menu can be reordered and items can be hidden (#71).
Auto save is split into "When a screenshot is done" and "When a pin is created", and a new option saves an extra original image when annotations or a watermark were added.
The Save dialog for screenshots, pins and GIF playback opens in the save folder from Settings by default (#90).
The full-screen crosshair now only shows while selecting an area; after the selection is confirmed, drawing tools use the normal crosshair cursor (#87).
The Text tool's cursor is now an I-beam (#49).
Writing a screenshot to the clipboard now happens on a background thread, so the UI no longer waits for the image to be encoded.
Toolbar icons are rendered at the actual pixel size and no longer look blurry; the icons and colors on the Settings pages are unified, and the translation page now puts the translation engine at the top.
Fixes
Fixed pressing Esc with the mouse over a pin while one of its dialogs (watermark text, layout adjust, color picker) was open: the first press left editing and the second closed the pin.
Fixed the text box edge showing a drag cursor while pressing there started selecting text instead.
Fixed the text in the GIF recording overlay menu being hard to read in the dark theme.
Fixed the clipboard hover preview covering the cursor and flickering when the clipboard window is next to the right screen edge.
Fixed the clipboard's multi-select context menu missing translations in non-Chinese languages.
Full Changelog: release-2.1.5...release-2.1.6