Some non-English characters overflow when the line height is reduced
for the tooltip text. This commit increases the line height of the
tooltips to accommodate these non-English characters and fixes the
hotkey hint margins for the same.
This commit enables the stylistic set "ss01" in Source Sans 3
font family which contains stylistic variant of the upper-case
character "I", which contains two bars, one each on the top and
bottom of the letter. This provides a uniform look across all
the characters when used in the hotkey hints of the tooltips.
The second line of a multi-line tooltip generally desctribes the
additional information which helps the major text, i.e. the first
line of the multi-line tooltip, hence it would be a good idea to
add italics styling, to differentiate it from the main title. We
describe a simple ".italic" class for the same.
We also add a shorter line height to this description using the
".tooltip-inner-content" class.
We add the support for hotkey hints for the tippyjs tooltips through
the hotkey_hints handlebar helper.
The hotkey_hints helper takes space seperated string arguments and
returns a span containing all the hotkeys with the required classes
for styling.
We also add a simple node test for the hotkey_hints handlebar helper.
Part of #21753
We use hsla(0, 0%, 20%, 1) for the light theme background color and
hsla(0, 0%, 0%, 1) for the dark theme. The text inside the tooltips
should be white in color, 14px in size and have a line height of 15px.
With one line of text, we want the height of the tooltips to be 25px,
i.e, line height (15px) + padding (5px + 5px = 10px).
Part of #21753
