Symbol Editor: Update New Symbol and Derive from Existing Symbol dialog.

Currently Derive from Existing Symbol dialog shows an infobar that doesn't update as (i think) it should, it doesn't update at all if i am not mistaken and this may be misleading when the dropdown list changes by accident.

Proposed patch, while not the best that can happen, seems to be good enough and work as expected.

(infobar is not really consistent when the original selection comes from a parent VS a derived symbol, but it sure is a slightly improvement of the current status, since it informs about what is going to happen, and also auto updates some other fields in the same dialog.)

MR preview:

update_derive_new_from

added 769 commits

• 69654efa...4e3488c2 - 768 commits from branch kicad/code:master
• 4c10ac2f - Symbol Editor: Update New Symbol and Derive from Existing Symbol dialog.

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marked this merge request as ready

changed the description

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• 9db3e9fe - Symbol Editor: Update New Symbol and Derive from Existing Symbol dialog.

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• 37a2c078 - Symbol Editor: Update New Symbol and Derive from Existing Symbol dialog.

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• ecbc146d - Symbol Editor: Update New Symbol and Derive from Existing Symbol dialog.

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added 284 commits

• ecbc146d...251a6a27 - 283 commits from branch kicad/code:master
• 4b591a4f - Symbol Editor: Update New Symbol and Derive from Existing Symbol dialog.

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Closing this MR until a successful rebase.

closed

mentioned in commit 72238985

mentioned in commit 50ae2ed8

Hi @aris-kimi I reworked MR to work with the filterable drop-down for the parent symbol. Just as in your work, it can now be swapped from inherited to not and back all within the dialog, which I otherwise didn't think of! Thanks for the MR and the great fixes in it - sorry it took me so long to get round to it, and the the underlying dialog changes meant it couldn't be applied directly!