Zoomable & Scrollable about zoom

[cmarqu]

Probably goes without saying, but horizontal zooming should work with Ctrl-Mousewheel and should zoom around the mouse pointer (like in map application). (There are commercial waveform viewers that instead zoom the center of the window, which doesn't quite feel natural these days.)

[drom]

• a sane starting zoom level. I get tired of opening a new waveform and having to hit the zoom out button a million times to see a single clock tick.

Originally posted by @nturley in #1 (comment)

[cmarqu]

"Each signal row has static height." - except for the "line chart" (aka "analog waveform") view, where the height of the row should be draggable.

[cmarqu]

In the "line chart" mode for a signal trace, the limits of the displayed trace should be zoomable and scrollable.