calibre:// URL scheme: allow specifying a Virtual library for show_book URLs.Note that this means that old voice, speed and audio devices setting will not be used so a reconfiguration might be needed. E-book viewer: Read aloud: On Windows switch to using the new Microsoft speech subsystem with access to more voices.Improve hover highlight color in tree views.Edit book: Spell Check dialog: Fix second word not getting selected when after first word is fixed.Fix a regression in calibre 5.0 that broke sorting the device view by title if one of the books has an empty title.E-book viewer: Fix a regression that caused a spurious error on Windows when reading out selected text.E-book viewer: Read aloud: Fix a regression in the previous release that caused an error when using Read aloud on a chapter with no text, such as the cover page.E-book viewer: Read aloud: Fix a regression in the previous release that caused the Read aloud controls to not reappear when Read aloud is canceled and restarted.Content server: Workaround for Safari regression causing bookmarks to disappear on reload.E-book viewer: Fix some adjacent highlights with nothing in between them not being displayed.Content server: E-book viewer: Long tapping on an image now causes it to be displayed in an internal popup rather than a new window as some browsers block the creation of new windows.

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