* change API to hide unity/default value line
* allow to override vertical scroll [1]
* allow changing button event forwarding [2]
[1] override scrolling in track-headers
[2] dbl-click is needed for BarControllers -> switch to SpinBtn
but a plain Slider on a track-header should not forward
these events to the TAV (they may trigger name-edit)
* update reserve so that round corners don't overlap
* draw complete 1px outline
* add API to hide/show the unity line
* don't show unity line at either end
* allow to shrink when the font-scaling changes
* re-introduce static pattern cache
(cairo's cache is not nearly large enough for A3 + plugins)
* only use cairo_clip on rectangles (not arbitrary paths
-> major performance boost
* re-add fader pixel reserve
* fix mouse + scroll interaction
* fix unity line display (1px wider, brighten by 150%)
* cache text size
* fix various other issues and consistent whitespace
This reverts large parts of commit d439e93b1e.
Always give ArdourButton a chance to handle Press or Release events if you override them.
This allows ArdourButtons to do the "Pressed" animation
And it now correctly eats the event so button clicks don't select the channelstrip.
It'd be nice if we could use 'ARDOUR::config_dir_name' for this purpose (or perhaps 'PROGRAM_VERSION'). However, neither is implemented widely enough at present to make this practical. Keep an eye on them though, as possible future strategies.
Consistent mixer strip button height.
The latter works by setting all the button size request heights to the
calculated height of the alphabet. Thus, all buttons of the same class will be
the same height regardless of their actual text.
