Click any items on index sidebar cause zoom-level to be reset to "Fit Page"

[Bagas Sanjaya]

When the user click any item on index site bar the zoom level of displayed document is always reset to "Fit Page". The user had to adjust zoom level again to match zoom level before such item-click.

Steps to reproduce:
1. Open a PDF that contains document structure (or index) using Atril
2. On sidebar, choose `Index` from document structure drop-down
3. Zoom the page (either using View -> Zoom In/Out or zoom level drop-down or Ctrl-mouse scroll shortcut)
4. Click any index item on the sidebar. The zoom level will be reset to "Fit Page"

Expected result: Zoom level stay same before and after clicking index item

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: atril 1.24.0-1
Uname: Linux 5.9.4-kernelorg-upstream-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 27 14:59:24 2020
InstallationDate: Installed on 2020-05-05 (205 days ago)
InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: atril
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2020-08-11T18:33:58.913741

[Bagas Sanjaya (bagasme)]

bug demonstration by opening an accounting book