fix: clear filter debouncer on connector reset

[sissbruecker]

Description

Currently a combo box can get stuck in a loading state if it is closed right after a filter change. The flow is something like:

• Changing filter runs data provider
  • Connector schedules debounced request
• Closing calls connector.reset
  • Calls comboBox.clearCache
  • This set a _forceNextRequest flag internally
• Debouncer fires
  • Loads data from server, puts it into cache
• Combo box is opened again
  • _forceNextRequest causes cached data to be ignored
  • Calls data provider again
  • Data communicator ignores request as data is already there
  • Loading state is never resolved

This fix changes connector.reset so that is also cancels any debounced requests, so that the connector will not attempt to load data after a reset and while the component is closed.

Fixes #8235

Type of change

• Bugfix

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[vaadin-bot]

Hi @sissbruecker and @sissbruecker, when i performed cherry-pick to this commit to 24.10, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick 1ba1170
error: could not apply 1ba1170... fix: clear filter debouncer on connector reset (#8563)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[vaadin-bot]

Hi @sissbruecker and @sissbruecker, when i performed cherry-pick to this commit to 25.0, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick 1ba1170
error: could not apply 1ba1170... fix: clear filter debouncer on connector reset (#8563)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[vaadin-bot]

Hi @sissbruecker and @sissbruecker, when i performed cherry-pick to this commit to 24.9, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick 1ba1170
error: could not apply 1ba1170... fix: clear filter debouncer on connector reset (#8563)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".