Rev 91eb04 in devel fixes #1507

[Edward K. Ream]

The fix #1507 for involved only a few lines of code, but is nonetheless tricky. Please test and report any problems.

This issue involves the @bool minibuffer-find-mode and @bool use-find-dialog settings. leoSettings.leo now contains the following comment for both settings:

The @bool use-find-dialog and @bool minibuffer-find-mode settings comprise
a tri-state setting, as shown in this table:
   
minibuffer-find-mode    use-find-dialog     mode: Ctrl-F puts focus in
--------------------    ---------------     --------------------------
    True                    Ignored         minibuffer
    False                   True            dialog
    False                   False           Find tab in the log pane

*All modes*

- Start the search with Ctrl-F (start-search).
- Enter the find pattern.
- (Optional) Use <Tab> to enter the search pattern.
- Use <Enter> to start the search.

*dialog and find tab modes*

- Non-functional "buttons" remind you of key bindings.

*minibuffer mode*

- Use Ctrl-G as always to leave the minibuffer.
- The Find tab is not made visible, but the status area shows the settings.

Edward