[stable22] Fix svg icons disapearing in app navigation when text overflows

[backportbot-nextcloud]

backport of #27936

[CarlSchwan]

I'm not sure if the failing test is related to my change...

[MichaIng]

Nearly ruled out as all tests succeeded on all other branches:

  Scenario: open a subfolder in a public shared folder                # /drone/src/tests/acceptance/features/app-files-sharing-link.feature:40
    Given I act as John                                               # ActorContext::iActAs()
    And I am logged in                                                # LoginPageContext::iAmLoggedIn()
    And I create a new folder named "Shared folder with subfolders"   # FileListContext::iCreateANewFolderNamed()
      │ Create menu button in file list could not be clicked
      │ Exception message: element not interactable
      │   (Session info: chrome=90.0.4430.85)
      │   (Driver info: chromedriver=90.0.4430.24 (4c6d850f087da467d926e8eddb76550aed655991-refs/branch-heads/4430@{#429}),platform=Linux 4.15.0-137-generic x86_64)
      │ Trying again
      │ 
    And I enter in the folder named "Shared folder with subfolders"   # FileListContext::iEnterInTheFolderNamed()
    And I create a new folder named "Subfolder"                       # FileListContext::iCreateANewFolderNamed()
      │ Create New folder menu item in file list could not be clicked
      │ Exception message: element not interactable
      │   (Session info: chrome=90.0.4430.85)
      │   (Driver info: chromedriver=90.0.4430.24 (4c6d850f087da467d926e8eddb76550aed655991-refs/branch-heads/4430@{#429}),platform=Linux 4.15.0-137-generic x86_64)
      │ Trying again
      │ 
      element not interactable
        (Session info: chrome=90.0.4430.85)
        (Driver info: chromedriver=90.0.4430.24 (4c6d850f087da467d926e8eddb76550aed655991-refs/branch-heads/4430@{#429}),platform=Linux 4.15.0-137-generic x86_64) (WebDriver\Exception\ElementNotVisible)
    And I enter in the folder named "Subfolder"                       # FileListContext::iEnterInTheFolderNamed()
    And I create a new folder named "Subsubfolder"                    # FileListContext::iCreateANewFolderNamed()
    And I see that the file list contains a file named "Subsubfolder" # FileListContext::iSeeThatTheFileListContainsAFileNamed()
    And I open the Files app                                          # FilesAppContext::iOpenTheFilesApp()
    And I share the link for "Shared folder with subfolders"          # FilesAppSharingContext::iShareTheLinkFor()
    And I write down the shared link                                  # FilesAppSharingContext::iWriteDownTheSharedLink()
    When I act as Jane                                                # ActorContext::iActAs()
    And I visit the shared link I wrote down                          # PublicShareContext::iVisitTheSharedLinkIWroteDown()
    And I see that the current page is the shared link I wrote down   # PublicShareContext::iSeeThatTheCurrentPageIsTheSharedLinkIWroteDown()
    Then I see that the file list contains a file named "Subfolder"   # FileListContext::iSeeThatTheFileListContainsAFileNamed()
    And I enter in the folder named "Subfolder"                       # FileListContext::iEnterInTheFolderNamed()
    And I see that the file list contains a file named "Subsubfolder" # FileListContext::iSeeThatTheFileListContainsAFileNamed()

This test fails quite often randomly.

But I cannot merge unless everything succeeded, and its good when someone with more insights has a look, or retriggers the drone checks.