Search plugin: Improve usability of “Export matches”

Roshani Kumarirequested to merge
roshani/kate:export-matches-usability into master

This MR improves the usability of the “Export matches” action in the Search plugin.

Changes:

  • Show “Export matches” only when regex mode is enabled
  • Improve the tooltip text to explain what the feature does
  • Mention support for capture groups like \0, \1, etc.

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