Mailplane 3.7
Uncomplex has released Mailplane 3.7 with its own version of the Quote Selected Text feature (previously provided by a now-retired Gmail Lab), which TidBITS publisher Adam Engst suggested to Uncomplex and subsequently helped them tweak. To use the feature, select some text and then press Command-R to Reply or Command-Option-R to Reply All. The Gmail-specific email client also adds a Bookmarks feature (a replacement for the retired Quick Links Gmail Lab) for saving frequent searches or links to individual messages, and it adds support for the public beta of macOS 10.13 High Sierra.
($24.95 new, free update, 63.2 MB, release notes, 10.10+)