MATE Terminal "Select All" action selects only the visible part of the screen (buffer)

[Saverio Miroddi]

(EDIT: this problem is actually related to the MATE Terminal bug, not to Tilix; it's described here: https://github.com/mate-desktop/mate-terminal/issues/372)

When performing the "Select All" action (Ctrl+Shift+A), only the bottom part of the scrollback buffer, corresponding to the last (visible) screen, is selected, instead of the entire buffer.

To reproduce:

- tap Enter until the buffer is two screens long
- select all (Ctrl+Shift+A)
- via scrollbar, go to the top of the buffer
- you can observe that the selection stops at the top of the bottom screen

This wasn't happening on Focal.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: tilix 1.9.4-2build1
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Uname: Linux 5.15.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.470
CurrentDesktop: MATE
Date: Tue May 31 10:46:52 2022
LiveMediaBuild: Ubuntu-MATE 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: tilix
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.