[Bug]: 开启新任务后媒体栏正确后移，关闭任务后不会自动回位（需手动重载）

Current behavior 🐛 On Skia, a TextBlock with LineStackingStrategy="BlockLineHeight" and a LineHeight larger than the font's natural line height places the baseline at LineHeight - descent, i.e. it pins the font's descent to the bottom of the line box. All the extra leading ends…

Current behavior 🐛 In a TextBlock with IsTextSelectionEnabled="True", two mouse cases throw away the selection the user just made: Drag-select that ends on a Hyperlink. Press on plain text, drag over the text onto a Hyperlink, release. The selection is highlighted during the…

Current behavior 🐛 When a focused TextBlock (for example one with IsTextSelectionEnabled="True" that the user clicked into) is removed from the tree, Uno clears focus completely: FocusManager.GetFocusedElement() returns null afterwards. A focused Control removed the same way…

Current behavior 🐛 Clicking (or touch-pressing) a Hyperlink inside a TextBlock does not move focus to the Hyperlink. After the press, FocusManager.GetFocusedElement() still returns the previously focused element (null in the repro below), Hyperlink.FocusState stays Unfocused and…