Separate Snap from Grid. Lots of naming changes.
Multiple simultaneous snap options allowed. Grid is one of the possible Snap options.
Grid uses the same data as the rulers. Replace complicated tempo_lines with simple grid_lines.
The Grid is zoom-scale-sensitive along with the rulers. If you are zoomed out, grid becomes coarser.
Snapped Cursor is a line that follows the edit point, and indicates where the operation will occur.
This replaces and extends the line that appears with the Cut tool.
New associated preferences: snap_threshold and show_snap_cursor.
Use separate editor + mixer flags for moving selected tracks into view.
Changing selection in the Editor will only pan the mixer-view and vice-
versa. This fixes an issue with the track that is being clicked-on to
be moved out of view (due to groups)
Generated by tools/f2s. Some hand-editing will be required in a few places to fix up comments related to timecode
and video in order to keep the legible
Editor::hide_track_in_display() -> EditorRoutes::hide_track_in_display()
and ensuing calls to sync the treeview may modify the selection
(de-select hidden tracks) and invalidate selection->tracks
Editor::redisplay_tempo() is called early on, before
Editor::set_timecode_ruler_scale() and Editor::compute_bbt_ruler_scale ()
are called. That is a bug which needs fixing (initial tempo+grid display)
. Still, uninitialized vars are not good.
If pending_visual_change.pending was zero when calling idle_visual_changer
the handler_id was never reset. and the idle-handler was never called
again.
This is necessary to allow calculation of correct intersection of visible
canvas area and items for the new Item::prepare_for_render() API.
samples_per_pixel must be set first to calculate the new horizontal canvas
position in Editor::set_horizontal_position and then
WaveView::set_samples_per_pixel will eventually call
WaveView::prepare_for_render for those items that are visible on the new canvas
position at the new position.
Or if there is not a change to zoom state then call Canvas::prepare_for_render
explicitly.
Also changes so that each method is only called once during
Editor::visual_changer
First visual change will be processed as normal and then blocked until the
canvas renders the change. If further visual changes need processing then
Editor::pre_render callback will schedule another expose/redraw/render.
This prevents an issue where idle_visual_changer is called many times in
response to events(keys/motion/etc) but the canvas does not get a chance to
render any but the last one which results in a big pause/jump.
This results in a more responsive canvas and in particular a smoother and more
predictable zooming experience.
This can be hard to reproduce and I have not been able to work out the steps to
reproduce reliably, but as it is still occuring work around the issue by just
checking the variable is valid before dereferencing it.
Resolves: #7304
