Opening the Graph Editor (header button, menu, Shift+F3, control channel)
frames the graphs on its first frame: Fit Selection to View when keys are
selected, else Fit All Graphs to View. Switching value/speed graph refits
too (different units). A selected key now shows its property's graph even
when its layer isn't selected, and Fit Selection on a lone key also frames
its neighbouring keys.
Co-Authored-By: Claude <[email protected]>
(cherry picked from commit a3c95f601e78e7a12f62aba94ee3515b2ade1670)
(cherry picked from commit d6309ffad79b91676d6409d1845de508e485873d)
(cherry picked from commit 78f557433742e443c9b7db34c1dac67e6a2b8e18)
(cherry picked from commit 7a4e160434b7bf1289cbf5900a86715814d1c791)
