fix(internal.resume): dynamic_preview_title was not respected and title became static

[cristiansofronie]

In Picker:new there was

    if obj.preview_title == nil or #obj.all_previewers > 1 then
      obj.preview_title = obj.previewer:title(nil, config.values.dynamic_preview_title)
    else
      obj.fix_preview_title = true
    end

so if a preview_title was not provided at creation it became static forever. This is a problem when you resume a picker as internal.resume calls Picker:new again and the same preview_title is populated during runtime by the dynamic_preview_title. So now that field is not nil and will become static forever.

To fix it add an additional check. If the picker is resumed and fix_preview_title is not already set by the first creation do not set it now.

This fixes #2689

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Manual testing. Set dynamic_preview_title = true in defaults when you setup Telescope and then open the find_files picker close it and resume.

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code

[jamestrew]

thanks 👍