This adds support for searching the terminal buffer using the
`@xterm/addon-search` library. It also adds three options for searching:
regex, case-sensitive, and whole-word. These can be included or excluded
from the search options for `useSearch` depending on whether the search
backend supports it.
I didn't like any of the Font Awesome icons for these toggles so until
we have time to make some of our own icons that better match the Font
Awesome style, I've appropriated VSCode's icons from their [codicons
font](https://github.com/microsoft/vscode-codicons).
To implement the toggle-able buttons for these options, I've introduced
a new HeaderElem component, `ToggleIconButton`. This is styled similarly
to `IconButton`, but when you hover over it, it also shows a highlighted
background and when active, it shows as fully-opaque and with an
accented border.
Also removes the `useDismiss` behavior for the search box to better
match behavior in other apps.
Also fixes the scrollbar observer from my previous PR so it's wider.
fixes bug with closeTab when the tab didn't exist in the waveWindow cache. also adds Cmd-Shift-W to close a tab (doesn't work for pinned tabs). and restores Cmd-W for killing blocks on pinned tabs
This functions very similarly to VSCode's pinned tab feature. To pin a
tab, you can right-click on it and select "Pin tab" from the context
menu. Once pinned, a tab will be fixed to the left-most edge of the tab
bar, in order of pinning. Pinned tabs can be dragged around like any
others. If you drag an unpinned tab into the pinned tabs section (any
index less than the highest-index pinned tab), it will be pinned. If you
drag a pinned tab out of the pinned tab section, it will be unpinned.
Pinned tabs' close button is replaced with a persistent pin button,
which can be clicked to unpin them. This adds an extra barrier to
accidentally closing a pinned tab. They can still be closed from the
context menu.
