feat(Unified search): Use existing min search length setting

[artonge]

This setting existed already for the legacy unified search.
This commit expose that setting to the new front-end, and also ignore non-valid requests in the backend.

We also take the opportunity to register the config in the lexicon.

Empty query	Short query	Valid query

[artonge]

There is already such a setting in the legacy unified search component. Will investigate.

Edit: I updated the code to reuse the existing config.

[artonge]

/backport to stable32

[artonge]

/backport to stable31

[marcoambrosini]

Non blocking, but ideally we should use the same sentence whether we have 0 or 1 char in the search field. The current proposal would result in a distracting flickering of the empty content string, unless it's debounced.

So from my pov either:

• say "Start typing to search" and don't change string when a char is added
• Keep proposed strategy but wait 1 sec before showing additional hint about the need of a second char. In this case the hint could be simplified as: "Type at least two characters to search"

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31

# Create the new backport branch
git checkout -b backport/55259/stable31

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 65d5bf20 fccb13e8 c8370f31

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/55259/stable31

Error: Failed to check for changes with origin/stable31: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[backportbot]

The backport to stable32 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable32
git pull origin stable32

# Create the new backport branch
git checkout -b backport/55259/stable32

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 65d5bf20 fccb13e8 c8370f31

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/55259/stable32

Error: Failed to push branch backport/55259/stable32: remote: {"auth_status":"auth_error","body":"Invalid username or token. Password authentication is not supported for Git operations."}
fatal: Authentication failed for 'https://github.com/nextcloud/server.git/'

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[artonge]

/backport fccb13e to stable32

[artonge]

/backport fccb13e to stable31

[backportbot]

The backport to stable32 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable32
git pull origin stable32

# Create the new backport branch
git checkout -b backport/55259/stable32

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick fccb13e8

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/55259/stable32

Error: Failed to push branch backport/55259/stable32: remote: {"auth_status":"auth_error","body":"Invalid username or token. Password authentication is not supported for Git operations."}
fatal: Authentication failed for 'https://github.com/nextcloud/server.git/'

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31

# Create the new backport branch
git checkout -b backport/55259/stable31

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick fccb13e8

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/55259/stable31

Error: Failed to check for changes with origin/stable31: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.