Completing a search via the issue filter using a mouse only

Related to: #25913 (closed)

When conducting usability testing (#26945 (closed)), it wasn't clear to users that they have to click enter in order to search / perform an action.

This is especially annoying to users who try to complete a series of actions using solely their mouse.

For example:

Applying a label

Selects a label (mouse) --> clicks enter to search (keyboard).

Deleting a label

Clicks the cross/delete icon within the search filter to remove all labels (mouse) -> clicks enter to return to an unfiltered view (keyboard).

It seems users are looking for a CTA: [Clip 1] (https://youtu.be/UF_zfCYgukw?t=8m16s), [Clip 2] (https://youtu.be/UF_zfCYgukw?t=10m23s), [Clip 3] (https://youtu.be/8c-hFMPLikE?t=7m36s), [Clip 4] (https://youtu.be/8c-hFMPLikE?t=8m22s).

However, their initial hesitation could also suggest that the list would auto-update/refresh as they applied a label or clicked on the cross/delete icon.

Additionally, there is also an issue with re-submitting a search which also requires a combination of mouse/keyboard.

Re-searching

As reported by @jk

After submitting a search and adding an extra label:

Selects a label (mouse) --> clicks enter to search (keyboard) --> clicks space to trigger top level filter menu for additional label (keyboard) --> selects an additional label (mouse) --> clicks enter to re-search (keyboard)

How can we improve the experience for users who want to complete a search solely via mouse?