Make sure show image actionhandler is only called once

[R0Wi]

• Fix The "close" button in the upper right corner has no function. #143
• showImage was called multiple time
• Close listener was therefore also registered multiple times and stopped working

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f492e78) to head (94af56b).
Report is 1 commits behind head on stable28.

Additional details and impacted files

@@             Coverage Diff              @@
##             stable28      #146   +/-   ##
============================================
  Coverage      100.00%   100.00%           
  Complexity          8         8           
============================================
  Files               1         1           
  Lines              29        29           
============================================
  Hits               29        29           

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[R0Wi]

The backport to master failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-master master
# Navigate to the new working tree
cd .worktrees/backport-master
# Create a new branch
git switch --create backport-146-to-master
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick ---mainline 1 f2a9f7491152295e3ff9a56a9c902f185dcaf4f8
# Push it to GitHub
git push --set-upstream origin backport-146-to-master
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-master

Then, create a pull request where the base branch is master and the compare/head branch is backport-146-to-master.

[R0Wi]

The backport to stable29 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-stable29 stable29
# Navigate to the new working tree
cd .worktrees/backport-stable29
# Create a new branch
git switch --create backport-146-to-stable29
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick ---mainline 1 f2a9f7491152295e3ff9a56a9c902f185dcaf4f8
# Push it to GitHub
git push --set-upstream origin backport-146-to-stable29
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-stable29

Then, create a pull request where the base branch is stable29 and the compare/head branch is backport-146-to-stable29.