feat(ui): overhauled resize and layout systems

* refactor(panes): move to parametric pane sizes

* Fixed the simpler errors by casting to usize

* The least I can do is pass the formatting check...

* Move to stable toolchain

* Well, it compiles?

* And now it doesn't! ;)

* Baseline functionality with the new Dimension type

* Working POC for percent-based resizing

* REVERT THIS COMMIT – DELETES TESTS

* Perfected the discrete resize algorithm

* Fixed fixed-size panes

* Basic bidirectional resize

* feat(resize): finalised parametric resize algorithm

* Reduce the logging level a bit

* Fixed nested layouts using percents

* Bug squishing for implicit sizing

* Here is a funky (read: rubbish) rounding approach

* And now it's gone again!

* Improve discretisation algorithm to fix rounding errors

* Fix the last layout bug (maybe?)

* Mixed explicit and implied percents work now

* Let's pretend that didn't happen...

* Make things a bit less crashy

* Crash slightly more for now (to find bugs)

* Manaually splitting of panes works now

* Start moving to percent-based resizes

* Everything but fullscreen seems to be working

* Fix compilatation errors

* Culled a massive amount of border code

* Why not pause to please rustfmt?

* Turns out I was still missing a few tests...

* Bringing back even more tests!

* Fix tests and pane boarders

* Fix the resize system without gaps

* Fix content offset

* Fixed a bug with pane closing

* Add a hack to fix setting of the viewport

* Fix toggling between shared borders and frames

* fix(tests): make e2e properly use PaneGeom

* style(fmt): make rustfmt happy

* Revert unintentional rounding of borders

* Purge some old borderless stuff

* Fix busted tab-bar shrinking

* Update E2E tests

* Finish implementing fullscreen!

* Don't crash anymore?

* Fix (almost) all tests

* Fix a lack of tab-stops

* All tests passing

* I really can't be bothered to debug a CI issue

* Tie up loose ends

* Knock out some lingering FIXMEs

* Continue to clean things up

* Change some naming and address FIXMEs

* Cull more code + FIXMEs

* Refactor of the resize system + polish

* Only draw frames when absolutely necessary

* Fix the tab-bar crash

* Fix rendering of boarders on reattach

* Fix resizing at small pane sizes

* Deduplicate code in the layout system

* Update tab-bar WASM

* Fixed the pinching of panes during resize

* Unexpose needlessly public type

* Add back a lost test

* Re-add tab tests and get them to compile

* All tabs need layouts

* Start fixing tests + bug in main

* Stabilize the resize algorithm rounding

* All tests from main are now passing

* Cull more dead code

3 files changed, 12 insertions, 9 deletions

diff --git a/zellij-client/src/lib.rs b/zellij-client/src/lib.rs
index e806ec3bf..7d67a01ac 100644
--- a/zellij-client/src/lib.rs
+++ b/zellij-client/src/lib.rs
@@ -116,7 +116,7 @@ pub fn start_client(
 
     let full_screen_ws = os_input.get_terminal_size_using_fd(0);
     let client_attributes = ClientAttributes {
-        position_and_size: full_screen_ws,
+        size: full_screen_ws,
         palette,
     };
 
@@ -137,7 +137,7 @@ pub fn start_client(
                 client_attributes,
                 Box::new(opts),
                 Box::new(config_options.clone()),
-                layout,
+                layout.unwrap(),
             )
         }
     };
diff --git a/zellij-client/src/os_input_output.rs b/zellij-client/src/os_input_output.rs
index 7242bf7aa..b5018c295 100644
--- a/zellij-client/src/os_input_output.rs
+++ b/zellij-client/src/os_input_output.rs
@@ -1,4 +1,5 @@
 use zellij_utils::input::actions::Action;
+use zellij_utils::pane_size::Size;
 use zellij_utils::{interprocess, libc, nix, signal_hook, termion, zellij_tile};
 
 use interprocess::local_socket::LocalSocketStream;
@@ -15,7 +16,6 @@ use zellij_tile::data::Palette;
 use zellij_utils::{
     errors::ErrorContext,
     ipc::{ClientToServerMsg, IpcReceiverWithContext, IpcSenderWithContext, ServerToClientMsg},
-    pane_size::PositionAndSize,
     shared::default_palette,
 };
 
@@ -35,7 +35,7 @@ fn unset_raw_mode(pid: RawFd, orig_termios: termios::Termios) {
     };
 }
 
-pub(crate) fn get_terminal_size_using_fd(fd: RawFd) -> PositionAndSize {
+pub(crate) fn get_terminal_size_using_fd(fd: RawFd) -> Size {
     // TODO: do this with the nix ioctl
     use libc::ioctl;
     use libc::TIOCGWINSZ;
@@ -54,7 +54,10 @@ pub(crate) fn get_terminal_size_using_fd(fd: RawFd) -> PositionAndSize {
     unsafe {
         ioctl(fd, TIOCGWINSZ.into(), &mut winsize)
     };
-    PositionAndSize::from(winsize)
+    Size {
+        rows: winsize.ws_row as usize,
+        cols: winsize.ws_col as usize,
+    }
 }
 
 #[derive(Clone)]
@@ -69,7 +72,7 @@ pub struct ClientOsInputOutput {
 /// Zellij client requires.
 pub trait ClientOsApi: Send + Sync {
     /// Returns the size of the terminal associated to file descriptor `fd`.
-    fn get_terminal_size_using_fd(&self, fd: RawFd) -> PositionAndSize;
+    fn get_terminal_size_using_fd(&self, fd: RawFd) -> Size;
     /// Set the terminal associated to file descriptor `fd` to
     /// [raw mode](https://en.wikipedia.org/wiki/Terminal_mode).
     fn set_raw_mode(&mut self, fd: RawFd);
@@ -98,7 +101,7 @@ pub trait ClientOsApi: Send + Sync {
 }
 
 impl ClientOsApi for ClientOsInputOutput {
-    fn get_terminal_size_using_fd(&self, fd: RawFd) -> PositionAndSize {
+    fn get_terminal_size_using_fd(&self, fd: RawFd) -> Size {
         get_terminal_size_using_fd(fd)
     }
     fn set_raw_mode(&mut self, fd: RawFd) {
diff --git a/zellij-client/src/unit/input_handler_tests.rs b/zellij-client/src/unit/input_handler_tests.rs
index 9b0bc71c1..a9b86a75d 100644
--- a/zellij-client/src/unit/input_handler_tests.rs
+++ b/zellij-client/src/unit/input_handler_tests.rs
@@ -2,7 +2,7 @@ use super::input_loop;
 use zellij_utils::input::actions::{Action, Direction};
 use zellij_utils::input::config::Config;
 use zellij_utils::input::options::Options;
-use zellij_utils::pane_size::PositionAndSize;
+use zellij_utils::pane_size::Size;
 use zellij_utils::zellij_tile::data::Palette;
 
 use crate::{os_input_output::ClientOsApi, ClientInstruction, CommandIsExecuting};
@@ -93,7 +93,7 @@ impl FakeClientOsApi {
 }
 
 impl ClientOsApi for FakeClientOsApi {
-    fn get_terminal_size_using_fd(&self, _fd: RawFd) -> PositionAndSize {
+    fn get_terminal_size_using_fd(&self, _fd: RawFd) -> Size {
         unimplemented!()
     }
     fn set_raw_mode(&mut self, _fd: RawFd) {