Improve Canvas Zoom Keyboard Shortcut UX

[AnshitaVishwa]

Fixes #1768

Initially the keyboard shortcuts for:

canvas-zoom-in:  ctrl + "="
canvas-zoom-out:  ctrl + "-"
canvas-zoom-fit:  ctrl + shift + "z"

The Improved Keyboard shortcuts for :

canvas-zoom-in:  "="
canvas-zoom-out:  "-"
canvas-zoom-fit:  "0"

[Keyikedalube]

This PR also closes my oldest issue I opened last year 👉 #1005 😁

UPDATE: Don't close my old issue yet. Another solution is already determined because the expected redo shortcut Ctrl + Shift + Z is not responding on SynfigStudio. Built and tested from this PR.

[ice0]

@AnshitaVishwa looks good, but please use tabs for formatting (the whole project uses tabs).

P.S. As this PR changes UX, it should be reviewed by @morevnaproject.

[AnshitaVishwa]

PR updated! Replaced Spaces with Tabs.

[Keyikedalube]

Maintainers, it's possible to have two keyboard shortcuts at the same time. For now, we have this PR implementing Inkscape style shortcuts

1. canvas-zoom-in   : =
2. canvas-zoom-out : -
3. canvas-zoom-fit   : 0

The above new canvas zoom shortcuts is already paving way for UX consistency for issue #1122

However, if you want to keep the legacy style

1. canvas-zoom-in   : Ctrl + =
2. canvas-zoom-out : Ctrl + -
3. canvas-zoom-fit   : Ctrl + 0 <--- New

It's possible with this PR #1776 I made; hidden menubar

So it's a win-win for both parties; improved vs legacy

[ice0]

However, if you want to keep the legacy style
...
It's possible with this PR #1776 I made; hidden menubar

Awesome! Which one needs to be merged first?

[morevnaproject]

So it's a win-win for both parties; improved vs legacy

I agree with that. This solution looks good to me!

[Keyikedalube]

Awesome! Which one needs to be merged first?

Either one :)

I'd merge this new contributor PR first just to avoid letting him rebase in case our changes conflict ;P

[ice0]

Merged. Thank you!