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When a button has a fixed size, there's no need to call queue_resize().
This fixes an issue with the ArdourClock info displays when slaved.
The Timecode and Delta display text changes in small intervals and
caused excessive CPU load due to GUI size-requests + redraws.
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Colors and patterns are cached, independent of active-state.
This didn't used to be the case in the distant ArdourButton past.
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Allow placing an icon left of some text in Ardour-button.
This also tweaks some spacing and alignment of Icons when
a LED toggle indicator is used.
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Add option to use ArduorButton as standalone Toggle/Checkbox.
Usually ArdourButton relegates this to Actions or is backed by Config.
This allows to use the Button as standalone Toggle, get_active()
It should maybe be a derived Class, but ArdourButton is already beyond
that..
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The queued resize will only happen trigger a size-request when the
widget is realized, and on_size_request() calls ensure_layout().
Moreover, this over protection meant that sometimes a resize wasn't
noticed by the button containers.
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make libwidget independent of libcanvas.
Confine basics to pbd and gtkmm2ext.
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