When the running app had mouse reporting on, moving the pointer over a
link with ctrl/cmd held never underlined it, while pressing the modifier
with the pointer already on the link did. `mouse_move` only scheduled
the hyperlink lookup outside of mouse mode, but the modifier change and
grid refresh paths don't check it, and ctrl/cmd-click already opens
links in mouse mode through `open_links_in_mouse_mode`.
Also look up the hovered link in mouse mode when that setting is on,
after the motion has been reported to the app.
Closes#64102
Delete with a modifier produced no input at all. Since the alt handling
was limited to single characters, alt-delete stopped sending the bogus
`ESC delete` and fell through to nothing, because delete was missing from
the modified special keys table next to insert, pageup and pagedown.
Modified delete now goes out as `CSI 3 ; <modifier> ~`, the same
encoding xterm and alacritty use.
Closes#64721
dualfroz
upstream