Add keybindings for CTRL, ALT, SHIFT + UP, DOWN, RIGHT, LEFT, HOME, END, BACKSPACE, DELETE & more (#3996)

* Added tests for `LightRenderer`

* Added common SHIFT, ALT and ALT+SHIFT key sequences

* Added common CTRL key sequences

* Added common CTRL+ALT, CTRL+SHIFT, CTRL+ALT+SHIFT key sequences

* Added proper xterm META modifier handling

according to defc6dd568/input.c (L357-L375)

* Fix `ctrl-backspace` and `ctrl-alt-backspace`

* Fix broken tcell tests on windows by swallowing Resize events

* Added tests for  FullscreenRenderer

* Removed own fork of tcell and updated tcell to 2.9.0

tcell 2.9.0 is needed for `Ctrl-Alt-*` and `Ctrl-Alt-Shift-*` shortcuts in Windows

* Replace conditional checks with switch statements to improve readability

* Replace long conditionals with constant slices to improve readability

* Bind `ctrl-bspace` (`ctrl-h`) to `backward-delete-char` by default

Since we now distinguish between Backspace and Ctrl-Backspace, Ctrl-Backspace should trigger the same action as Backspace by default. In that way nothing changes for the user but you can bind other actions to Ctrl-Backspace when desired.

man/man1/fzf.1

@@ -1473,12 +1473,22 @@ e.g.
 .br
 \fIalt\-right\fR
 .br
+\fIalt\-home\fR
+.br
+\fIalt\-end\fR
+.br
+\fIalt\-backspace\fR  (\fIalt\-bspace\fR \fIalt\-bs\fR)
+.br
+\fIalt\-delete\fR
+.br
+\fIalt\-page\-up\fR
+.br
+\fIalt\-page\-down\fR
+.br
 \fIalt\-enter\fR
 .br
 \fIalt\-space\fR
 .br
-\fIalt\-backspace\fR  (\fIalt\-bspace\fR \fIalt\-bs\fR)
-.br
 \fItab\fR
 .br
 \fIshift\-tab\fR      (\fIbtab\fR)
@@ -1505,6 +1515,26 @@ e.g.
 .br
 \fIpage\-down\fR      (\fIpgdn\fR)
 .br
+\fIctrl\-up\fR
+.br
+\fIctrl\-down\fR
+.br
+\fIctrl\-left\fR
+.br
+\fIctrl\-right\fR
+.br
+\fIctrl\-home\fR
+.br
+\fIctrl\-end\fR
+.br
+\fIctrl\-backspace\fR  (\fIctrl\-bspace\fR \fIctrl\-bs\fR)
+.br
+\fIctrl\-delete\fR
+.br
+\fIctrl\-page\-up\fR
+.br
+\fIctrl\-page\-down\fR
+.br
 \fIshift\-up\fR
 .br
 \fIshift\-down\fR
@@ -1513,8 +1543,16 @@ e.g.
 .br
 \fIshift\-right\fR
 .br
+\fIshift\-home\fR
+.br
+\fIshift\-end\fR
+.br
 \fIshift\-delete\fR
 .br
+\fIshift\-page\-up\fR
+.br
+\fIshift\-page\-down\fR
+.br
 \fIalt\-shift\-up\fR
 .br
 \fIalt\-shift\-down\fR
@@ -1523,6 +1561,72 @@ e.g.
 .br
 \fIalt\-shift\-right\fR
 .br
+\fIalt\-shift\-home\fR
+.br
+\fIalt\-shift\-end\fR
+.br
+\fIalt\-shift\-delete\fR
+.br
+\fIalt\-shift\-page\-up\fR
+.br
+\fIalt\-shift\-page\-down\fR
+.br
+\fIctrl\-alt\-up\fR
+.br
+\fIctrl\-alt\-down\fR
+.br
+\fIctrl\-alt\-left\fR
+.br
+\fIctrl\-alt\-right\fR
+.br
+\fIctrl\-alt\-home\fR
+.br
+\fIctrl\-alt\-end\fR
+.br
+\fIctrl\-alt\-backspace\fR  (\fIctrl\-alt\-bspace\fR \fIctrl\-alt\-bs\fR)
+.br
+\fIctrl\-alt\-delete\fR
+.br
+\fIctrl\-alt\-page\-up\fR
+.br
+\fIctrl\-alt\-page\-down\fR
+.br
+\fIctrl\-shift\-up\fR
+.br
+\fIctrl\-shift\-down\fR
+.br
+\fIctrl\-shift\-left\fR
+.br
+\fIctrl\-shift\-right\fR
+.br
+\fIctrl\-shift\-home\fR
+.br
+\fIctrl\-shift\-end\fR
+.br
+\fIctrl\-shift\-delete\fR
+.br
+\fIctrl\-shift\-page\-up\fR
+.br
+\fIctrl\-shift\-page\-down\fR
+.br
+\fIctrl\-alt\-shift\-up\fR
+.br
+\fIctrl\-alt\-shift\-down\fR
+.br
+\fIctrl\-alt\-shift\-left\fR
+.br
+\fIctrl\-alt\-shift\-right\fR
+.br
+\fIctrl\-alt\-shift\-home\fR
+.br
+\fIctrl\-alt\-shift\-end\fR
+.br
+\fIctrl\-alt\-shift\-delete\fR
+.br
+\fIctrl\-alt\-shift\-page\-up\fR
+.br
+\fIctrl\-alt\-shift\-page\-down\fR
+.br
 \fIleft\-click\fR
 .br
 \fIright\-click\fR
@@ -1547,6 +1651,8 @@ e.g.
 .br
 or any single character
 
+Note that some terminal emulators may not support \fIctrl-*\fR bindings.
+
 .SS AVAILABLE EVENTS:
 \fIstart\fR
 .RS
@@ -1699,7 +1805,7 @@ A key or an event can be bound to one or more of the following actions.
     \fBaccept\-non\-empty\fR             (same as \fBaccept\fR except that it prevents fzf from exiting without selection)
     \fBaccept\-or\-print\-query\fR        (same as \fBaccept\fR except that it prints the query when there's no match)
     \fBbackward\-char\fR                \fIctrl\-b  left\fR
-    \fBbackward\-delete\-char\fR         \fIctrl\-h  bspace\fR
+    \fBbackward\-delete\-char\fR         \fIctrl\-h ctrl\-bspace bspace\fR
     \fBbackward\-delete\-char/eof\fR     (same as \fBbackward\-delete\-char\fR except aborts fzf if query is empty)
     \fBbackward\-kill\-word\fR           \fIalt\-bs\fR
     \fBbackward\-word\fR                \fIalt\-b   shift\-left\fR