Two problems in the Character Styles panel and its options dialog.
Opening the options took the panel menu's item, which is easy to miss; a double-click on a style's
row did nothing beyond applying the style a second time. A double-click on a user character style's
row now opens its Character Style Options (`ui.charStyleOptions`), as the menu item does. A single
click still applies the style, the second click of the double-click does not apply it again (the
Normal style's included), and with Shift, Cmd/Ctrl or Alt held the double-click only follows the
click rules. The built-in Normal style opens no dialog. Double-clicking a paragraph style's row similarly opens
its options, which are the rename dialog the Paragraph Styles panel menu opens (`ui.paramDialog`
running `paraStyle.rename`): paragraph styles have no full options window yet.
The dialog then grew with its content: the General section lists every attribute of the style, so
the window covered the screen and its buttons could sit below it. The content now scrolls both ways
inside a window at most 420 points tall (less on a short screen) and never wider than the points
left beside the section list, with one scroll offset per section. The dialog keeps a fixed width of
720 points, enough for the widest section's controls, in every section. The content's height is the
space the footer leaves, measured from the footer drawn last frame, so a large interface scale's
taller footer is reserved too and OK and Cancel stay visible. The section list stays outside the
scroll area, so scrolling a long section never moves the navigation; the section is read after the
list handles a click, so a newly picked section gets its own scroll offset in the same frame.
Tests:
`panels::text_styles::tests::double_clicking_a_character_style_row_opens_its_options` selects text,
double-clicks a character style's row and checks the dialog opens with the style's name, one apply
ran from the first click and the second click applied nothing; a paragraph style's row opens none.
`double_clicking_the_normal_style_opens_no_options` checks the Normal style opens none and is
applied once.
`dialogs::char_style_options::tests::the_sections_scroll_in_a_window_shorter_than_the_general_list`
draws the dialog on a 900 by 560 point screen and checks OK and Cancel stay on it, the dialog keeps
its 720-point width in two sections, and the General list is taller than its scroll area.
`every_section_and_the_buttons_fit_the_smallest_window` checks the app's minimum 800 by 500 point
window in all five sections: every section label, OK and Cancel are on the screen.
`a_scrolled_section_keeps_its_offset_after_switching_away_and_back` scrolls General, clicks Basic
Character Formats and then General again, and checks General''s content returns to the same place:
the section is read after the list handles the click, so no other section stores its offset.
`every_section_and_the_buttons_fit_the_smallest_window_at_twice_the_scale` checks the same in the
400 by 250 points the minimum window holds at 2x UI scale, before and after a wheel scrolls the
content.
Docs: type-parity (a panel row and the revision history), ui-parity (a panel row and the revision
history), target-app-parity (two evidence bullets and the revision history) and roadmap (the
revision history), with the status lines updated.
A paragraph that ends in a soft return ends with the empty line after it,
so the line the soft return ends is justified like any other; it was taken
for the paragraph's last line and left aligned.
A preferences file from before the Help Bar setting gets `help_bar` from
`status_bar` when it is read. A save that changed only the status bar
left `help_bar` out of the file, so the next start hid the Help Bar with
the status bar. A save now writes `help_bar` whenever the file lacks it,
and keeps a value another window saved.
Docs: the UI evidence list, the UI checklist and the M14 row record
Window > Help Bar.
