T58: the terminal shows a scrollbar over its history, which a user asked for in issue #2 after 0.1.5, since a program that takes the mouse takes the wheel: a thumb along the right edge, in Ely's sizes and colors, stands where the view stands, and a drag moves the view through the history; none shows without history

TASKS.md

@@ -140,11 +140,12 @@ Progress truth. Top to bottom, one at a time. A task is ticked only after its co
 
 - [x] T54 Release v0.1.5 with T51 to T53: version 0.1.5; the macOS disk image, the Windows zip and the Linux tarball, each from its script; the notes list what changed.
 
-## 30. Ely's drag and updates
+## 30. Ely's drag, updates and the scrollbar
 
 - [x] T55 A drag moves Ely along the edge she stands on, which the owner asked for after 0.1.5: she follows the pointer sideways inside the pane, on macOS, Windows and X11 as it moves, on Wayland, whose popup keeps its place, once it lets go; where she stands, in points from the pane's left edge, the settings keep as `ely_left`.
 - [x] T56 Settings › Terminal checks for updates, which the owner asked for after 0.1.5: under Ely, a switch checks ELYTerminal's latest release at start and once a day, on by default, and a button checks at once; the row says what the check found, and a newer release brings a button that opens its page; a newer release an automatic check finds posts a system notification, whose press opens that page.
+- [x] T58 The terminal shows a scrollbar over its history, which a user asked for in issue #2 after 0.1.5, since a program that takes the mouse takes the wheel too: a thumb along its right edge, in Ely's sizes and colors, stands where the view stands in the history, and a drag on it moves the view through it; none shows without history, as on the alternate screen, and a press on it never reaches the terminal.
 
 ## 31. Release
 
-- [ ] T57 Release v0.1.6 with T55 and T56: version 0.1.6; the macOS disk image, the Windows zip and the Linux tarball, each from its script; the notes list what changed.
+- [ ] T57 Release v0.1.6 with T55, T56 and T58: version 0.1.6; the macOS disk image, the Windows zip and the Linux tarball, each from its script; the notes list what changed.