Connect and disconnect strips for easy selection and transformation
(ctrl+alt+c by default). Alt may be used to select individual connected strips.
Audio and video strips from the same file are connected by default; this may be
disabled in Preferences (Editing > Video Sequencer).
(PR#124333)
Thumbnails for movie and image strips load faster, and are much less "flickering"
(e.g. no longer reload on undo).
For dense timelines, the thumbnail repainting is also several times faster.
For new files they are enabled by default now.
(PR#126405, PR#126972, PR#127403)
Timeline area default tool is Box Select now. All selection functionality
is combined into it, replacing the Tweak tool. (PR#129028)
The preview area now supports snapping.
Source points include the four corners and origins of all selected, visible strips.
Snap targets can be the preview boundaries, the preview center,
or the corners/origins of other strips.
(PR#122759)
Preview area default tool is Box Select now, and toolbars are shown by default.
(PR#126336)
Color Balance modifier is several times faster
(for regular images) or a bit faster (for float/HDR images).
(PR#127121)
Saturation and Multiply strip color controls are several times faster (multi-threaded now).
(PR#127409)
Tonemap modifier is 10-15 times faster
(multi-threaded luminance estimation, color conversion optimizations).
(PR#127467)
For images at the bottom channel that use Alpha Over blend mode,
the actual "blend with transparent black" step can be skipped now.
This particularly helps float images, e.g. EXR image with RGBA channels at the bottom.
(PR#127310)
