This should return the content excluding borders and is used to create an image when dragging tabs. Long-term we probably should create a special drag image rather than ask the tab to draw itself.
Integrate visually file manager header in tab bar when tabs above document
option in on. If tabs above document are off then use default gradient L&F.
Bottom divider for file browser header view is not integrated in header for
easier control if it is shown or not.
Previously we would still perform layout on the tabs to the left since with tabs having equal width, the layout should result in the same. Now that we compress tabs, the layout can change.
In theory the user could close a tab, have the mouse remain inside the tab bar, and then perform an action that changes the underlying tabs, which would then leave us with tab item views that need layout.
This seems appropriate given that label font is used below toolbar icons and the tick marks on a slider. Here we use it below the available colors.
We also use it for OakCreateSmallLabel() which is only used for status messages in the registration window.
This way when asking for a fitting size we get back the minimum size with all but the centering constraint met (and minimized).
In theory the compression resistance for the text field only need to be NSLayoutPriorityFittingSizeCompression+1 but for reasons I do not yet understand, we need to set it higher than NSLayoutPriorityDefaultLow, otherwise the fitting width will occasionally be 64.
Until the 10.10 SDK we could use the compiler’s synthesized getter for our ‘tag’ property, but NSView.h in the 10.10 SDK declares ‘tag’ via the @property syntax and it is effectively unsupported to redeclare a readonly property as readwrite in a subclass (clang will not synthesize getter/setter methods in the subclass).
When we close a tab with the mouse we “freeze” the layout rectangle of the tabs before the one closed, however, if this group contains non-visible tabs during close (as is mostly the case when showing the overflow button) then one of those would be made visible (since we closed a tab that took up space) and this new tab would be squeezed into the saved layout rectangle.
